Radio Shack Scanner 20 521 User Guide

Cat. No. 20-521  
Owner’s Manual  
PRO-91 150-Channel  
Handheld Trunking Scanner  
Please read before using this equipment.  
 
Five Channel-Storage Banks — you can store up to  
30 channels in each of 5 different banks to group chan-  
nels so you can more easily identify calls.  
Five Scan Lists — you can store up to 50 trunking IDs  
in each trunk tracking bank.  
Two-Second Scan Delay — delays scanning for about  
2 seconds before moving to another channel, so you  
can hear more replies that are made on the same chan-  
nel.  
Lock-Out Function — lets you set your scanner to skip  
over specified channels or frequencies when scanning  
or searching, and skip over IDs when tracking trunked  
systems.  
Priority Channels — lets you program one channel in  
each bank (5 in all) and then have the scanner check  
that channel every 2 seconds while it scans the bank,  
so you don't miss transmissions on those channels.  
Five Service Banks — frequencies are preset in sepa-  
rate police (fire/emergency), aircraft, ham, marine, and  
weather banks, to make it easy to locate specific types  
of calls.  
Hypersearch— lets you set the scanner to search at  
up to 300 steps per second. The normal search speed  
is 100 steps per second.  
Hyperscan— the scanner automatically scans up to  
50 channels per second in frequency bands with 5 kHz  
steps, to help you quickly find interesting broadcasts.  
Key Lock — lets you lock the scanner's keys to help  
prevent accidental changes to the scanner's program-  
ming.  
Data Signal Skip — lets you set the scanner to skip  
non-modulated or data signals (such as fax or modem  
transmissions) during searches. This lets the scanner  
avoid non-voice signals, making a search faster.  
Manual Access — lets you directly access any channel.  
Liquid-Crystal Display — makes it easy to view and  
change programming information.  
Display Backlight — makes the scanner easy to read  
in low-light situations.  
 
3
Flexible Antenna with BNC Connector — provides  
excellent reception and is designed to help prevent an-  
tenna breakage. Or, you can connect an external an-  
tenna.  
Monitor Memories — let you temporarily store up to 5  
frequencies or IDs.  
Memory Backup — keeps the frequencies stored in  
memory for an extended time if the PRO-91 loses pow-  
er.  
Three Power Options — let you power the scanner  
using internal batteries, external AC power using an  
optional AC adapter/charger, or DC power using an op-  
tional DC cigarette-lighter power cable.  
Key Confirmation Tones — the scanner sounds a  
tone when you perform an operation correctly, and an  
error tone if you make an error.  
Battery Save — saves battery power when the scan-  
ner does not detect any transmissions for more than 5  
seconds when a channel is manually selected.  
Battery Low Alert — warns you when battery power  
gets low.  
Your scanner can receive these bands:  
Frequency  
Step  
Transmission  
Range (MHz)  
(kHz)  
29–29.7  
29.7–50  
5
5
5
10-Meter Ham Band  
VHF Lo  
50–54  
6-Meter Ham Band  
108–136.9750  
137–144  
12.5 Aircraft  
5
5
5
Military Land Mobile  
2-Meter Ham Band  
VHF Hi  
144–148  
148–174  
406–420  
420–450  
450–470  
470–512  
806–956  
12.5 Federal Government  
12.5 70-cm Ham Band  
12.5 UHF Standard Band  
12.5 UHF “T” Band  
12.5 Public Service  
“800” Band, except  
cellular band  
 
4
We recommend you record your scanner’s serial num-  
ber here. The number is on the back panel.  
Serial Number: ___________________________  
FCC NOTICE  
Your scanner might cause radio or TV interference  
even when it is operating properly. To determine wheth-  
er your scanner is causing the interference, turn off  
your scanner. If the interference goes away, your scan-  
ner is causing it. Try the following methods to eliminate  
the interference:  
• Move your scanner away from the receiver  
• Connect your scanner to an outlet that is on a dif-  
ferent electrical circuit from the receiver  
• Contact your local RadioShack store for help  
Note:  
Mobile use of this scanner is unlawful or requires  
a permit in some areas. Check the laws in your area.  
SCANNING LEGALLY  
Your scanner covers frequencies used by many differ-  
ent groups including police and fire departments, ambu-  
lance services, government agencies, private  
companies, amateur radio services, military operations,  
pager services, and wireline (telephone and telegraph)  
service providers. It is legal to listen to almost every  
transmission your scanner can receive. However, there  
are some transmissions you should never intentionally  
listen to. These include:  
Telephone conversations (cellular, cordless, or  
other private means of telephone signal transmis-  
sion)  
• Pager transmissions  
• Any scrambled or encrypted transmissions  
According to the Electronic Communications Privacy  
Act (ECPA), you are subject to fines and possible im-  
prisonment for intentionally listening to, using, or divulg-  
ing the contents of such a transmission unless you  
have the consent of a party to the communication (un-  
less such activity is otherwise illegal).  
This scanner is designed to prevent reception of illegal  
transmissions, in compliance with the law which re-  
 
5
quires that scanners be manufactured in such a way as  
to not be easily modifiable to pick up those transmis-  
sions. Do not open your scanner's case to make any  
modifications that could allow it to pick up transmis-  
sions that it is not legal to listen to. Doing so could sub-  
ject you to legal penalties.  
We encourage responsible, legal scanner use.  
CONTENTS  
Preparation ............................................................ 10  
Power Sources ................................................. 10  
Using Internal Batteries ............................ 10  
Charging Nickel-Cadmium Batteries ......... 12  
Using AC Power ....................................... 13  
Using Vehicle Battery Power .................... 14  
Connecting the Antenna .................................. 16  
Connecting an Optional Antenna .............. 16  
Connecting an Earphone/Headphones ............ 17  
Listening Safely ........................................ 17  
Traffic Safety ............................................. 17  
Connecting an Extension Speaker ................... 18  
Attaching the Belt Clip ...................................... 18  
About Your Scanner .............................................. 19  
A Look at the Keypad ....................................... 20  
A Look at the Display ....................................... 21  
Understanding Banks ....................................... 23  
Service Banks ........................................... 23  
Channel Storage Banks ............................ 23  
Monitor Memories ..................................... 24  
Operation ............................................................... 25  
Turning On the Scanner/Setting Squelch ......... 25  
Storing Known Frequencies into Channels ...... 26  
Searching For and Temporarily Storing  
Active Frequencies ........................................... 27  
Limit Search .............................................. 27  
Direct Search ............................................ 28  
Service Bank Search ................................ 29  
Search Skip Memory ................................ 30  
Listening to the Monitor Memories ................... 31  
Moving a Frequency From a Monitor Memory  
to a Channel ..................................................... 31  
Scanning the Stored Channels ........................ 32  
Manually Selecting a Channel ......................... 32  
 
6
Special Features .................................................... 34  
Delay ................................................................ 34  
Turning Channel-Storage Banks On and Off ... 34  
Locking Out Channels ...................................... 35  
Priority .............................................................. 35  
Using the Keylock ............................................ 37  
Using the Display Backlight .............................. 37  
Changing Search Speeds ................................ 37  
Turning the Key Tone Off/On ............................ 38  
Turning the Battery Save Function Off/On ....... 38  
Skipping Data Signals ...................................... 39  
Trunk Tracking ....................................................... 40  
Types of Trunking Systems .............................. 40  
Setting the Scanner to the  
Trunk Tracking Mode ........................................ 41  
Setting Squelch for the Trunk Tracking Mode .. 42  
Storing Trunked Frequencies ........................... 42  
Scanning a Trunked Bank ................................ 44  
Monitoring an Active ID ............................. 45  
Temporarily Storing an ID into the  
Monitor ID Memory ................................... 45  
Locking Out IDs ........................................ 46  
Unlocking a Single ID ................................ 46  
Unlocking All IDs ....................................... 46  
Using Trunk Tracking Scan Delay ............. 47  
Monitoring IDs ........................................... 47  
Channel Activity Bars ....................................... 48  
Scan Lists ......................................................... 49  
Manually Storing IDs into Scan Lists ........ 49  
Moving IDs to Scan Lists .......................... 50  
Deleting a Stored ID .................................. 50  
Scanning the Scan Lists ................................... 51  
Scanning Type I and Hybrid Trunked  
Systems ............................................................ 51  
Selecting a Preset Fleet Map .................... 55  
Programming a Fleet Map ........................ 56  
Programming a Hybrid System ................. 57  
A General Guide to Scanning ............................... 58  
Guide to Frequencies ....................................... 58  
National Weather Frequencies .................. 58  
Canadian Weather Frequencies ............... 58  
Birdie Frequencies .................................... 58  
Guide to the Action Bands ............................... 59  
Typical Band Usage .................................. 59  
Primary Usage .......................................... 59  
Band Allocation ................................................ 60  
 
7
Frequency Conversion 63  
Troubleshooting 64  
Resetting the Scanner ..................................... 67  
Care and Maintenance .......................................... 68  
Specifications ........................................................ 69  
 
8
PREPARATION  
POWER SOURCES  
You can power your scanner from any of three sources:  
• Internal batteries (not supplied)  
• Standard AC power (using an optional AC adapter)  
• Vehicle battery power (using an optional DC  
adapter)  
Using Internal Batteries  
You can power your scanner using four AA batteries.  
For the longest operation and best performance, we  
recommend alkaline batteries (such as Cat. No. 23-  
552).  
You can also use four rechargeable nickel-cadmium  
batteries (Cat. No. 23-125). Before you use nickel-cad-  
mium batteries, you must charge them (see “Charging  
Nickel-Cadmium Batteries” on Page 11).  
Follow these steps to install batteries.  
VOLUME/OFF  
1. Turn  
counterclockwise until it clicks  
to make sure the power is turned off.  
2. Slide up and hold the tab on the back of the scan-  
ner, then pull up the battery compartment cover.  
 
9
3. If you are installing alkaline batteries, use a  
pointed object such as a pencil to set ALKALINE  
JACK  
NI-CD inside the compartment to  
ALKALINE. Or, if you are installing nickel-cadmium  
batteries, set it to NI-CD.  
Warning: Never set ALKALINE  
JACK  
NI-CD  
to NI-CD if you are installing non-rechargeable bat-  
teries. Non-rechargeable batteries can get hot or  
explode if you try to recharge them.  
4. Install two batteries in the compartment and two in  
the cover as indicated by the polarity symbols (+  
and –) marked inside those locations.  
Cautions:  
Use only fresh batteries of the required size and  
recommended type.  
Always remove old or weak batteries. Batteries  
can leak chemicals that destroy electronic cir-  
cuits.  
Do not mix old and new batteries, different  
types of batteries (standard, alkaline, or  
rechargeable), or rechargeable batteries of dif-  
ferent capacities.  
5. Replace the cover.  
 
10  
If BATT.Loflashes and the scanner beeps every 15  
seconds, replace (standard/alkaline) or recharge (re-  
chargeable nickel-cadmium) the batteries.  
Caution: Always dispose of old batteries promptly and  
properly. Do not bury or burn them.  
Charging Nickel-Cadmium Batteries  
The scanner has a built-in circuit that lets you recharge  
nickel-cadmium batteries while they are in the scanner.  
To charge the batteries, set ALKALINE  
JACK  
NI-  
CD to NI-CD, install the nickel-cadmium batteries in the  
scanner, and connect an external AC or DC adapter to  
the scanner’s POWER jack (see “Using AC Power” on  
Page 12 or “Using Vehicle Battery Power” on Page 13).  
Warning: Do not connect either adapter to the scanner  
if non-rechargeable batteries (such as alkaline batter-  
ies) are installed in the scanner and ALKALINE  
JACK  
NI-CD is set to NI-CD, or you are unsure of the  
switch’s position. Non-rechargeable batteries will get  
hot and can even explode if you try to recharge them.  
Before you use nickel-cadmium batteries for the first  
time, charge them at least 24 hours to bring them to a  
full charge.  
Discharged batteries take about 10 to 18 hours to fully  
recharge. If you use the scanner while the batteries are  
charging, charging takes longer.  
Notes:  
• Nickel-cadmium batteries last longer and deliver  
more power if you occasionally let them fully dis-  
charge. To do this, simply use the scanner until it  
beeps every 15 seconds and BATT.Loflashes.  
To prevent damage to nickel-cadmium batteries,  
never charge them in an area where the tempera-  
ture is above 113°F or below 40°F.  
 
11  
Important: At the end of a rechargeable battery’s use-  
ful life, it must be recycled or disposed of properly.  
Contact your local, county, or state hazardous waste  
management authorities for information on recycling or  
disposal programs in your area. Some options that  
might be available are: municipal curb-side collection,  
drop-off boxes at retailers such as your local Ra-  
dioShack store, recycling collection centers, and mail-  
back programs.  
Using AC Power  
You can power the scanner from a standard AC outlet  
using an optional AC adapter (such as Cat. No. 273-  
1665).  
Warning: Do not use an AC adapter’s polarized plug  
with an extension cord, receptacle, or other outlet un-  
less the blades can be fully inserted to prevent blade  
exposure.  
Cautions:  
• The recommended AC adapter supplies 9 volts  
and delivers at least 300 milliamps. It has a barrel  
plug with a center negative tip that correctly fits the  
scanner’s POWER jack. Using an adapter that  
does not meet these specifications could damage  
the scanner or the adapter.  
To protect your scanner and AC adapter, always  
plug the adapter into the scanner before you plug  
it into the AC outlet, and always unplug the  
adapter from the AC outlet before you unplug it  
from the scanner.  
• If batteries are installed, make sure the battery  
switch inside the battery compartment is set to the  
correct position (see “Using Internal Batteries” on  
Page 9).  
 
12  
1. Turn VOLUME/OFF counterclockwise until it clicks  
to make sure the power is turned off.  
2. Plug the adapter’s 3.4 mm outside diameter/1.3  
mm inside diameter barrel plug into your scanner’s  
POWER jack.  
3. Plug the other end of the adapter into a standard  
AC outlet.  
If rechargeable batteries are installed and ALKALINE  
JACK  
NI-CD is set to NI-CD, the adapter powers the  
scanner and recharges the batteries at the same time.  
Using Vehicle Battery Power  
You can power the scanner from your vehicle’s battery  
power using an optional DC adapter such as Cat. No.  
270-1560.  
Cautions:  
• The recommended DC adapter supplies 9 volts  
and delivers at least 300 milliamps. It has a barrel  
plug with a center negative tip that correctly fits the  
scanner’s POWER jack. Using an adapter that does  
not meet these specifications could damage the  
scanner or the adapter.  
To protect your vehicle’s electrical system, always  
plug the adapter into the scanner before you plug it  
into your vehicle’s cigarette-lighter socket. Always  
unplug the adapter from the vehicle’s cigarette-  
lighter socket before you unplug it from the scan-  
ner.  
• If batteries are installed, make sure the battery  
switch inside the battery compartment is set to the  
correct position (see “Using Internal Batteries” on  
Page 9).  
 
13  
1. Turn VOLUME/OFF counterclockwise until it clicks  
to make sure the power is turned off.  
2. Set the adapter’s voltage switch to 9V.  
3. Connect the 3.4 mm outer diameter/1.3 mm inner  
diameter tip to the adapter cord, matching TIP to –.  
4. Plug the adapter’s barrel plug into your scanner’s  
POWER jack.  
5. Plug the other end of the adapter into your vehi-  
cle’s cigarette-lighter socket.  
If you have installed rechargeable batteries and  
set ALKALINE  
JACK  
NI-CD to NI-CD, the  
adapter powers the scanner and recharges the  
batteries at the same time.  
Note: If the scanner does not operate properly when  
you use a DC adapter, unplug the adapter from the cig-  
arette-lighter socket and clean the socket to remove  
ashes and debris.  
 
14  
CONNECTING THE ANTENNA  
Follow these steps to attach the supplied flexible anten-  
na to the connector on the top of your scanner.  
1. Align the slots around the antenna’s connector with  
the tabs on the scanner’s BNC connector.  
2. Slide the antenna’s connector down over the scan-  
ner’s connector and rotate the antenna connector’s  
outer ring clockwise until it locks into place.  
Connecting an Optional Antenna  
The scanner’s BNC connector makes it easy to connect  
a variety of optional antennas (such as an external mo-  
bile antenna or outdoor base station antenna). Your lo-  
cal RadioShack store sells a variety of antennas.  
Note:  
Always use 50-ohm coaxial cable, such as RG-  
58 or RG-8, to connect an outdoor antenna. If the dis-  
tance from the scanner to the antenna is over 50 feet,  
use RG-8 low-loss dielectric coaxial cable. If your an-  
tenna’s cable does not have a BNC connector, your lo-  
cal RadioShack store carries  
adapters.  
a
variety of BNC  
 
15  
CONNECTING AN EARPHONE/  
HEADPHONES  
For private listening, you can plug an earphone or  
mono headphones (such as Cat. No. 33-178 or 20-  
210) into the  
jack on top of your scanner. This auto-  
matically disconnects the internal speaker.  
Listening Safely  
To protect your hearing, follow these guidelines when  
you use an earphone or headphones.  
• Do not listen at extremely high volume levels.  
Extended high-volume listening can lead to per-  
manent hearing loss.  
• Set the volume to the lowest setting before you  
begin listening. After you begin listening, adjust  
the volume to a comfortable level.  
• Once you set the volume, do not increase it. Over  
time, your ears adapt to the volume level, so a vol-  
ume level that does not cause discomfort might  
still damage your hearing.  
Traffic Safety  
Do not use an earphone or headphones with your  
scanner when operating a motor vehicle in or near traf-  
fic. Doing so can create a traffic hazard and could be il-  
legal in some areas.  
If you use an earphone or headphones with your scan-  
ner, be very careful. Do not listen to a continuous  
broadcast. Even though some earphones/headphones  
let you hear some outside sounds when listening at  
normal volume levels, they still can present a traffic  
hazard.  
 
16  
CONNECTING AN EXTENSION  
SPEAKER  
In a noisy area, an extension speaker (such as Cat. No.  
21-549), positioned in the right place, might provide  
more comfortable listening. Plug the speaker cable’s  
1/8-inch mini-plug into your scanner’s  
jack.  
ATTACHING THE BELT CLIP  
You can attach the supplied belt clip to make your  
scanner easier to use when you are on the go. Use a  
Phillips screwdriver and the supplied screws to attach  
the belt clip to the scanner. Then slide the clip over your  
belt or waistband.  
 
17  
ABOUT YOUR SCANNER  
Once you understand a few simple terms we use in this  
manual and familiarize yourself with your scanner’s  
features, you can put the scanner to work for you. You  
simply determine the type of communications you want  
to receive, then set the scanner to scan those commu-  
nications.  
frequency  
A
is the tuning location of a station (ex-  
pressed in kHz or MHz). To find active frequencies,  
search  
you use the  
function.  
Besides searching within a frequency range you deter-  
service  
mine, you can also search your scanner’s  
banks  
. Service banks are preset groups of frequencies  
categorized by type of service. For example, many am-  
HAM2  
ateur radio frequencies are located in the  
bank.  
service  
When you find a frequency, you can store it into a pro-  
channel  
grammable memory location called a  
. Chan-  
. (This  
scanner has 5 channel-storage banks of 30 channels  
scan  
channel-storage banks  
nels are grouped into  
each). You can then  
the channel-storage banks  
to see if there is activity on the frequencies stored  
there.  
Or, when you find a frequency, you can store it into a  
temporary memory location called a monitor memory  
until you decide whether or not to move it to a channel.  
Just keep in mind — you search frequencies and scan  
channels.  
You can also use your scanner to track trunked trans-  
missions (see “Trunk Tracking” on Page 39).  
 
18  
A LOOK AT THE KEYPAD  
Your scanner’s keys might seem confusing at first, but  
this information should help you understand each key’s  
function.  
HOLD — holds the frequency search; holds on the cur-  
rent ID in the trunk tracking mode.  
SCAN — scans through the stored channels.  
MAN (manual) — stops scanning and lets you directly  
enter a channel number or frequency.  
PROG (program) — stores frequencies into channels;  
programs the trunking frequency, fleet map, and ID  
memories.  
TRUNK — switches between conventional and trunk  
tracking.  
LIMIT/SRC (search) — starts a limit search; searches a  
specified frequency range to find frequencies; searches  
for another active ID while trunk tracking.  
DATA  
— turns on or off the data signal skip feature;  
moves through menu settings while trunk tracking.  
PRIORITY/H/S (Hypersearch) — sets and turns on and off  
the priority feature; turns on and off Hypersearch.  
L-OUT/S/S (search skip) — lets you lock out selected  
channels or skip specified frequencies during a search;  
lets you lock out a selected ID while trunk tracking.  
KEYLOCK/  
— locks the keypad to prevent acciden-  
tal program changes; turns on the display light for 15  
seconds.  
 
19  
DELAY — programs a 2-second delay for the selected  
channel, a limit search, or each service scan; programs  
a 5-second delay while trunk tracking.  
t — searches down through a selected frequency  
range during a frequency search; selects options dur-  
ing program operation; changes the ID location number  
while trunk tracking.  
s — searches up through a selected frequency range  
during a frequency search; selects options during pro-  
gram operation; changes the ID location number while  
trunk tracking.  
Number Keys — each key has a single-digit label and a  
range of numbers. The single digits are used to enter a  
channel, frequency, service bank, or ID number. The  
range of numbers (31–60, for example) are used to en-  
ter the channels that make up a memory bank.  
MON/CLEAR/ — stores frequencies into monitor mem-  
ories during a search; recalls frequencies from monitor  
memories when programming  
a
channel; stores  
searched IDs into monitor memories or selects options  
while trunk tracking; enters a decimal point or clears an  
incorrect entry.  
SVC (service)/E (enter) — starts a service bank search;  
enters frequencies into channels.  
A LOOK AT THE DISPLAY  
The display has indicators that show the scanner’s cur-  
rent operating status. A good look at the display will  
help you understand how your scanner operates.  
BANK — appears with numbers (1–5). The numbers  
show which channel-storage banks are turned on for  
scanning.  
TRUNK — appears when the scanner is set for trunk  
tracking.  
 
20  
(trunking channel activity bars) — each represents a  
received trunking frequency or a data frequency while  
trunk tracking (see “Channel Activity Bars” on Page 47).  
-1-— appears when the weather service band is se-  
lected.  
-2-— appears when the amateur radio service band  
is selected.  
-3- — appears when the marine service band is se-  
lected.  
-4-— appears when the air service band is selected.  
-5-— appears when the police service band is select-  
ed.  
— appears when a priority channel is selected.  
BATT.Lo— blinks when the scanner’s battery is low.  
DATA  
P
— appears when the data skip function is active.  
SCAN— appears when you scan channels.  
LIST — appears with numbers (1–5) during trunk  
tracking. Numbers with a bar under them show which  
ID scan list banks are turned on for scanning.  
SVC — appears during a service search.  
SEARCH — appears during a limit search and ID  
search, and blinks when you monitor IDs (see “Monitor-  
ing IDs” on Page 46).  
PRI— appears when the priority feature is turned on.  
HOLD— appears when you manually select a channel  
or when the scanner is holding during a search.  
DLY— appears when you program a delay.  
L/O— appears when you manually select a channel or  
frequency you locked out.  
K/L(keylock) — appears when you lock the keypad.  
Error— appears when you make an entry error.  
 
21  
MON — appears during search modes or when you  
select a monitor memory. The number to the right of  
this indicator shows the current monitor memory num-  
ber.  
MAN— appears when you press MAN.  
PGM — appears while you store a frequency into a  
channel, while you enter a frequency range during a  
limit search, or when you program trunking frequen-  
cies, fleet maps, or ID memories while trunk tracking.  
HYPER — appears while Hyperscan or Hypersearch  
is active during a direct or limit search.  
t and s — appears during a limit, direct, or service  
search, indicating the search direction.  
— appears when the battery save function is active  
S
(during conventional scanning only).  
UNDERSTANDING BANKS  
Service Banks  
The scanner is preprogrammed with all the frequencies  
allocated to the weather, ham, marine, aircraft, and po-  
lice (fire/emergency) services. This is handy for quickly  
finding active frequencies instead of doing a limit  
search (see “Service Bank Search” on Page 28).  
Channel Storage Banks  
To make it easier to identify and select the channels  
you want to listen to, channels are divided into 5 banks  
of 30 channels each. Use each channel-storage bank  
to group frequencies, such as those for the police de-  
partment, fire department, ambulance services, or air-  
craft (see “Guide to the Action Bands” on Page 58).  
For example, the police department might use four fre-  
quencies, one for each side of town. You could pro-  
gram the police frequencies starting with Channel 1  
(the first channel in bank 1), and program the fire de-  
partment frequencies starting with Channel 31 (the first  
channel in bank 2).  
 
22  
Monitor Memories  
The scanner also has 5 temporary memory locations  
called monitor memories. You can use these monitor  
memories to temporarily store frequencies while you  
decide whether to store them into a channel. This is  
handy for quickly storing an active frequency when you  
search through an entire band (see “Searching For and  
Temporarily Storing Active Frequencies” on Page 26).  
While you are searching frequencies, the 5 numbers at  
the top of the display indicate the 5 monitor memories.  
MONappears and the number beside it that flashes in-  
dicates the currently active monitor memory.  
 
23  
OPERATION  
TURNING ON THE SCANNER  
AND SETTING SQUELCH  
Note:  
Make sure the scanner’s antenna is connected  
before you turn it on.  
SQUELCH  
1. Turn  
fully counterclockwise.  
VOLUME/OFF  
2. Turn  
clockwise until it clicks and you  
hear a hissing sound.  
MAN  
3. Press  
(manual) to stop the scanner from  
SQUELCH  
scanning, turn  
clockwise, then leave it  
set to a point just after the hissing sound stops.  
 
24  
STORING KNOWN FREQUENCIES  
INTO CHANNELS  
Good references for active frequencies are Ra-  
dioShack's “Beyond Police Call,” “Aeronautical Fre-  
quency Directory,” and “Maritime Frequency Directory.”  
We update these directories every year, so be sure to  
get a current copy.  
Follow these steps to store frequencies into channels.  
1. Press MAN, enter the channel number where you  
want to store a frequency, then press PROG. The  
channel number appears.  
2. Use the number keys and to enter the frequency  
(including the decimal point) you want to store.  
1
3. Press E to store the frequency into the channel.  
Notes:  
If you entered an invalid frequency in Step 2,  
Error appears and the scanner beeps three  
times. Simply enter the frequency again.  
 
25  
Your scanner automatically rounds the entered  
frequency to the nearest valid frequency. For  
example, if you enter a frequency of 151.473,  
your scanner accepts it as 151.475.  
Press DELAY if you want the scanner to pause 2  
seconds after a transmission ends before it pro-  
ceeds to the next channel (see “Delay” on  
Page 33). The scanner also stores this setting  
in the channel.  
4. If you want to program the next channel in  
sequence, press PROG and repeat Steps 2 and 3.  
SEARCHING FOR AND  
TEMPORARILY STORING ACTIVE  
FREQUENCIES  
If you do not have a reference to frequencies in your  
area, use a limit, direct, or service search to find a  
transmission. Also see “Guide to the Action Bands” on  
Page 58.  
Notes: While doing a limit, direct, or service bank  
search, you can press:  
DELAY if you want the scanner to pause 2 seconds  
after a transmission ends before it proceeds to the  
next frequency (see “Delay” on Page 33).  
DATA  
if you want the scanner to skip data signals  
(such as fax or modem signals) and search only  
for audio (voice) signals (see “Skipping Data Sig-  
nals” on Page 38).  
Limit Search  
A limit search lets you search within a specific range  
of frequencies. -L-appears during a limit search.  
1. Press PROG, then LIMIT. Lo and 29.000 MHz  
appear.  
 
26  
2. Enter the frequency that is the lower limit of the  
range you want to search (including the decimal  
point), then press E.  
3. Press LIMIT. Hiand 956.000MHzappear.  
4. Enter the frequency that is the upper limit of the  
range you want to search (including the decimal  
point), then press E again.  
5. Press t to search from the upper to the lower limit,  
or s to search from the lower to the upper limit.  
6. When the scanner stops  
on  
a
transmission,  
quickly ss either:  
HOLD to stop search-  
ing so you can listen  
to the transmission.  
HOLDappears.  
MON/CLEAR to store  
the displayed fre-  
quency into he cur-  
rent monitor mmory.  
To release hold and continue searching, press  
HOLD or hold down t or s for at least 1 second. Or,  
if you did not press HOLD, simply press t or s to  
continue searching.  
Direct Search  
Direct search lets you search up or down from the cur-  
rently displayed frequency.  
1. Press MAN.  
2. Use the number keys to enter the frequency you  
want to start the search from. Press to enter a  
decimal point.  
 
27  
Notes:  
If you want to start the search from a frequency  
already stored in one of your scanner’s chan-  
nels, press MAN or PROG, use the number keys  
to enter the channel number, then press MAN or  
PROG again.  
If you enter an invalid frequency, the scanner  
displays Error. Simply repeat this step.  
3. Press t to search downward or s to search upward  
from the selected frequency. -d-, SEARCH, and t  
or s appear.  
4. When the scanner stops on a transmission,  
quickly press either:  
HOLD to stop searching so you can listen to the  
transmission. HOLDappears.  
MON/CLEAR to store the displayed frequency  
into the current monitor memory.  
To release hold and continue searching, press  
HOLD or hold down t or s for at least 1 second. Or,  
if you did not press HOLD, simply press t or s to  
continue searching.  
Note: To step through the frequencies while HOLD  
is displayed, press t or s.  
Service Bank Search  
You can search for weather, ham, marine, aircraft, or  
police (fire/emergency) transmissions even if you do  
not know the specific frequencies being used in your  
area. The scanner is preprogrammed with all the fre-  
quencies allocated to these services. To use this fea-  
ture, press SVC. SVC appears and the scanner  
searches through the weather service band. To select  
a different service bank, press the desired service bank  
key (WX1, HAM2, MRN3, AIR4, or POL5). The corre-  
sponding service band number (-1-, -2-, -3-, -4-,  
or -5-) appears, and the scanner starts searching the  
band.  
 
28  
When the scanner stops on a transmission, quickly  
press either:  
HOLD to stop searching so you can listen to the  
transmission. HOLDappears.  
MON/CLEAR to store the displayed frequency into  
the current monitor memory.  
To release hold and continue searching, press  
HOLD or hold down t or s for at least 1 second. Or,  
if you did not press HOLD, simply press t or s to  
continue searching.  
Note: Because there are many different frequencies al-  
located to fire and police departments, it takes several  
minutes to search all these frequencies.  
Search Skip Memory  
You can skip up to 20 specified frequencies during a  
limit or direct search and up to 20 specified frequencies  
during a service bank search. This lets you avoid un-  
wanted frequencies or ones you have already stored in  
a channel.  
To skip a frequency, press  
S/S when the scanner  
stops on the frequency dur-  
ing a limit, direct, or service  
search. The sanner stores  
the frequein memory  
and  
amatically  
re-  
sumes the search.  
To clear a single frequency from skip memory so the  
scanner once again stops on it during a limit, direct, or  
service bank search:  
1. Press HOLD to hold the search.  
2. Press t or s to select the frequency. L/Oap-pears.  
3. Press S/S. L/Odisappears.  
To clear all the skip frequencies at once while search-  
ing, press HOLD, then hold down S/S until the scanner  
beeps twice (about 3 seconds).  
 
29  
Notes:  
• If you marked all frequencies to be skipped within  
the search range, the scanner beeps 3 times and  
does not search.  
• If you program more than 20 frequencies to skip,  
each new frequency replaces one you already  
stored, starting from the first frequency you stored.  
• Press t or s to select a skipped frequency while  
HOLD appears. L/O appears when you select a  
skipped frequency.  
LISTENING TO THE MONITOR  
MEMORIES  
You can listen to the fre-  
quency you stored in any  
one of the five monitor  
memories by pressing  
MAN, N/CLEAR, then  
the nmber of the moni-  
tor memory you want to  
listen to (1 5).  
Note: To listen to the  
monitor mmories, the  
priority chanel feature  
must be turned off (see  
“Priority” on Page 34).  
MOVING A FREQUENCY FROM A  
MONITOR MEMORY TO A  
CHANNEL  
1. Press MAN. MAN  
appears.  
2. Enter the number of  
the chnel where  
you want to store  
the frequency in a  
monitor  
memory,  
then press PROG.  
PGMapears.  
 
30  
3. Press MON/CLEAR and enter the number of the  
monitor memory that contains the frequency you  
want to store.  
4. Press E. The scanner stores the frequency into the  
selected channel.  
SCANNING THE STORED  
CHANNELS  
To begin scanning channels, press SCAN. The scanner  
scans through all non-locked channels in the activated  
banks. (See “Locking Out Channels” on Page 34 and  
“Turning Channel-Storage Banks On and Off” on  
Page 33). When the scanner finds a transmission, it  
stops on it. When the transmission ends, the scanner  
resumes scanning.  
Notes:  
• If you have not stored frequencies into any chan-  
nels, the scanner does not scan.  
• If the scanner picks up unwanted, partial, or very  
weak transmissions, turn SQUELCH clockwise to  
decrease the scanner's sensitivity to these signals.  
If you want to listen to a weak or distant station,  
turn SQUELCH counterclockwise.  
• If SQUELCH is adjusted so you always hear a hiss-  
ing sound, the scanner does not scan properly.  
To scan in the trunk tracking mode, see “Scanning  
a Trunked Bank” on Page 43.  
MANUALLY SELECTING A  
CHANNEL  
You can continuously monitor a single channel without  
scanning. This is useful if you hear an emergency  
broadcast on a channel and do not want to miss any  
details — even though there might be periods of silence  
— or if you want to monitor a specific channel.  
Follow these steps to manually select a channel.  
1. Press MAN.  
2. Enter the channel number.  
3. Press MAN again.  
 
31  
Or, if your scanner is scanning and stops at the desired  
channel, press MAN one time. (Pressing MAN addition-  
al times causes your scanner to step through the chan-  
nels.)  
To resume automatic scanning, press SCAN.  
 
32  
SPECIAL FEATURES  
DELAY  
Many agencies use a two-way radio system that might  
have a period of 2 or more seconds between a query  
and a reply. To keep from missing a reply on a specific  
channel, you can program a 2-second delay into any  
channel or frequency. The scanner continues to moni-  
tor the channel frequency for 2 seconds after the trans-  
mission stops before resuming scanning or searching.  
To program a 2-second delay:  
• If the scanner is  
scanning and stops  
on an active channel  
where you want to  
store a delay, quickly  
DELAY  
press  
before it  
contis scanning  
agaiDLYappears.  
• If the desired channel is not selected, manually  
DELAY  
select the channel, then press  
pears.  
. DLY ap-  
DELAY  
• If the scanner is searching, press  
while the  
scanner is searching. DLYappears and the scan-  
ner automatically adds a 2-second delay to every  
frequency it stops on in that band.  
DELAY  
To turn off the 2-second delay, press  
while the  
scanner is monitoring a channel, scanning, or search-  
ing. DLYdisappears.  
TURNING CHANNEL-STORAGE  
BANKS ON AND OFF  
You can turn each channel-storage bank on and off.  
When you turn off a bank, the scanner does not scan  
any of the 30 channels in that bank.  
While scanning, press the number key that corresponds  
to the bank you want to turn on or off. Numbers appear  
at the top of the display, showing the currently selected  
banks.  
 
33  
The scanner scans all the channels within the dis-  
played banks that are not locked out (see “Locking Out  
Channels”).  
Notes:  
• You can manually select any channel within a  
bank, even if that bank is turned off.  
• You cannot turn off all banks. One bank must  
always be active.  
LOCKING OUT CHANNELS  
You can increase the scanning speed by locking out  
channels that have a continuous transmission, such as  
a weather channel. To lock out a channel, manually  
select the channel, then press L-OUT. L/Oappears.  
Note: You can still manually select locked out chan-  
nels.  
To remove the lockout from a channel, manually select  
the channel, then press S/S. L/Odisappears.  
To unlock all channels in the banks that are turned on,  
press MAN to stop scanning, then hold down L-OUT un-  
til the scanner beeps twice.  
PRIORITY  
The priority feature lets you scan through channels and  
still not miss important or interesting calls on specific  
channels. You can program one stored channel in each  
bank as a priority channel (for up to a total of 5 stored  
channels). If the priority feature is turned on, as the  
scanner scans the bank, it checks that bank’s priority  
channel every 2 seconds for activity.  
The scanner automatically designates each bank's first  
channel as its priority channel. Follow these steps to  
select a different channel in a bank as the priority chan-  
nel.  
 
34  
1. Press PROG.  
2. Enter the channel number you want to select as  
the priority channel, then press PRIORITY.  
P
appears to the right of the channel number.  
3. Repeat Steps 1 and 2 for the channel in each bank  
you want to program as a priority channel.  
To review all priority channels, press PROG, then re-  
peatedly press PRIORITY to see the numbers of the pri-  
ority channels.  
To turn on the priority feature, press PRIORITY during  
scanning. PRIappears. Every 2 seconds the scanner  
checks the priority channel in each bank that is turned  
on.  
To turn off the priority feature, press PRIORITY. PRI  
disappears.  
Notes:  
• The priority feature must be turned off to listen to  
the monitor memories or to use the data skip fea-  
ture.  
You can lock out pri-  
ority channels. If you  
lock out all priority  
channels,  
LOCOUt  
appears when you  
turn on the priority  
feature.  
 
35  
USING THE KEYLOCK  
Once you program your scanner, you can protect it  
from accidental program changes by turning on the  
keylock feature. When locked, the only controls that  
operate are SCAN, MAN, KEYLOCK, VOLUME/OFF, and  
SQUELCH.  
Note:  
The keylock does not prevent the scanner from  
scanning channels.  
To turn on the keylock, hold down KEYLOCK until K/L  
appears. To turn it off, hold down KEYLOCK until K/L  
disappears.  
USING THE DISPLAY BACKLIGHT  
You can turn on the display light for easy viewing at  
night. Press  
to turn on the display light for 15 sec-  
onds. To turn off the light before 15 seconds elapse,  
press the button again.  
CHANGING SEARCH SPEEDS  
The PRO-91 has two search speeds.  
Normal Search  
Hypersearch  
100 steps/second  
300 steps/second  
To switch between the normal and Hypersearch  
speeds during limit search or direct search, press H/S.  
HYPERappears during Hypersearch.  
Note:  
You can use Hypersearch only in the 5 kHz step  
bands (29–54 MHz and 137–174 MHz).  
 
36  
TURNING THE KEY TONE OFF/ON  
To turn off the key tone, follow these steps.  
1. Turn off the scanner.  
2. While holding down L-OUT/S/S, turn on the scan-  
ner. OFFbEEPappears.  
To turn the key tone back on, repeat these steps. on  
bEEPappears.  
TURNING THE BATTERY SAVE  
FUNCTION OFF/ON  
To save battery power when a channel is manually se-  
lected or while you program the scanner, the scanner  
automatically sets itself to a standby (battery save)  
mode if no button is pressed for more than 5 seconds  
and no signal is received.  
save is set to on.  
appears when battery  
S
While the battery save mode is set to on, the scanner  
repeatedly turns off the internal power for 1 second,  
then turns it back on for about 1/2 second to check for a  
transmission.  
The scanner is preset with the battery save mode set to  
on, but you can turn it off or back on.  
Note:  
The battery save mode does not work if the prior-  
ity function is on, even if a channel is manually select-  
ed.  
To turn the battery save function off or back on, turn off  
the scanner, then hold down PRIORITY and turn on the  
scanner.  
OFFSAVEbriefly appears when battery save has  
been turned off.  
on SAVE briefly appears when battery save has  
been turned on.  
 
37  
SKIPPING DATA SIGNALS  
You can set the scanner so it skips nonmodulated or  
data signals (such as fax or modem transmissions)  
during a search or scan.  
Note:  
Since data signals are not generally found in the  
air band, this feature does not work in the air band.  
To turn on the data skip feature, be sure the priority  
feature is turned off (see “Priority” on Page 34), then  
DATA  
press  
press  
.
appears. To turn off the feature,  
DATA  
again.  
DATA  
disappears.  
DATA  
 
38  
TRUNK TRACKING  
Your scanner is designed to track transmissions on Mo-  
torola Type I, Type II, and hybrid analog trunking sys-  
tems, which are extensively used in 800 MHz  
communications. Remember these important points  
when tracking transmissions:  
Your scanner monitors Type II systems by default.  
However, you can change this if the system in your  
area is different (see “Types of Trunking Systems”  
below and “Scanning Type I and Hybrid Trunked  
Systems” on Page 50 for more information).  
Your scanner cannot track transmissions on non-  
Motorola trunking systems.  
Your scanner cannot track an 800 MHz trunked  
system and scan conventional frequencies at the  
same time.  
• The frequencies for many of the 800 MHz public  
safety systems are listed in the separate “National  
Public Safety Trunked System Frequency Guide”  
included with your PRO-91.  
TYPES OF TRUNKING SYSTEMS  
Your trunk tracking scanner can monitor two basic types  
of systems — Type I and Type II. Instead of selecting a  
specific frequency to transmit on, a trunked system  
chooses one of several frequencies in a 2-way radio us-  
er’s talk group when that user presses PTT (push to  
talk). Thus, trunking systems allocate a few frequencies  
among many different users, but the way Type I and  
Type II systems do this is slightly different. One impor-  
tant distinction between these systems is the amount of  
data transmitted by each radio when its push-to-talk  
(PTT) button is pressed. In a Type I system, the radio’s  
ID and its current affiliation (the trunk system it belongs  
to) are both transmitted. In a Type II system, only the ra-  
dio’s ID is transmitted.  
Why the difference? In Type I systems, each radio in  
the trunk group individually transmits its own affiliation,  
while the trunk system maintains a database that deter-  
mines each radio's affiliation(s) in Type II systems.  
Another difference between the systems is that Type I  
systems are arranged in a fleet-subfleet hierarchy. For  
example, it is possible for a city using a Type I system  
to designate 4 fleets, each with 8 subfleets.  
 
39  
The fleets might be the police department, the fire de-  
partment, utilities, and city administration. The police  
might decide to further divide its fleet into subfleets  
such as dispatch, tactical operations, detectives, north,  
south, east and west side patrols, and supervisors. All  
the available police radios would then be assigned to  
one of the police subfleets, letting the police centralize  
their communications and control the type of users on  
a single system. Determining the exact fleet-subfleet  
hierarchy for a particular area is referred to as fleet  
map programming.  
The disadvantage of a Type I system is that the brief  
burst of data sent when a user transmits must contain  
the radio’s ID and its fleet and subfleet. This is three  
times the amount of data a Type II system radio sends.  
Since the data capacity of Type I systems is limited and  
the amount of data increases with each user, Type I  
systems usually accommodate fewer users than Type  
II systems. Nevertheless, Type I systems are still in  
use.  
There are also hybrid systems which are a combination  
of both Type I and Type II. Your scanner defaults to  
monitor Type II systems, but you can change to Type I  
or a hybrid of Type I and Type II systems by selecting a  
preprogrammed fleet map or creating a custom fleet  
map for your area (see “Scanning Type I and Hybrid  
Trunked Systems” on Page 50).  
You do not need to determine the fleet-subfleet hierar-  
chy for Type II systems unless you are tracking hybrid  
systems that contain both Type I and Type II systems.  
SETTING THE SCANNER TO THE  
TRUNK TRACKING MODE  
Press TRUNK to switch between conventional scanning  
and trunk tracking.  
 
40  
SETTING SQUELCH FOR THE  
TRUNK TRACKING MODE  
Your scanner’s squelch setting is automatically adjust-  
ed during trunk tracking, which means it is not neces-  
sary to manually adjust squelch while tracking trunked  
transmissions. However, the squelch setting can affect  
how fast your scanner acquires the data channel, and,  
in some instances, can prevent your scanner from ac-  
quiring the data channel at all.  
We recommend you set SQUELCH to this position before  
selecting a trunked bank.  
Note:  
You can change this setting, if necessary, to pro-  
vide better performance in your area.  
STORING TRUNKED  
FREQUENCIES  
Before you set up your scanner to track a trunked sys-  
tem, consider the following:  
• Valid trunked system frequencies range from  
851.0000–868.9875 in 12.5 kHz steps.  
You can use any of your scanner’s banks as either  
a trunk tracking bank or conventional scanning  
bank, but you cannot mix the two.  
• The scanner only scans one trunked system at a  
time. Although you can store frequencies for more  
than one trunked system in one of your scanner’s  
banks, the scanner only scans the frequencies  
associated with the first data channel it finds.  
 
41  
Before scanning a trunked system’s transmissions, you  
must store the trunked system’s frequencies in one of  
the banks in your scanner by following these steps.  
1. Press PROG then TRUNK. TRUNK appears and  
one or more bank numbers flash.  
2. Select the bank you want to store the trunked sys-  
tem’s frequencies in by pressing a number key.  
The scanner automatically selects the first channel  
in the bank when you select the bank.  
3. Use the number keys to enter one of the trunked  
system’s frequencies, then press E. TRUNK,  
BANKand the bank number, the channel number,  
and the frequency appear.  
Note: If you entered an invalid frequency, the  
scanner beeps, the channel number flashes and  
Errorappears. If this happens, press to clear  
the frequency, then repeat this step.  
4. Press either PROG or s to select the next channel  
in the bank.  
5. Repeat Steps 3 and 4 until all frequencies have  
been entered in that bank.  
 
42  
6. Press  
SRC  
to begin  
searching for the trunk’s  
data channel (the channel  
that controls the trunk).  
SEARCH flashes as the  
scanner searches for the  
data channel.  
While the scanner looks through the frequencies,  
you see them on the display. When the scanner  
finds the data channel, it begins trunk tracking.  
SCANNING A TRUNKED BANK  
You can scan one trunked bank at a time. Once you  
have stored frequencies for a trunked system in one or  
more of the 5 available banks and you are scanning  
conventional (non-trunked) frequencies, follow these  
steps to begin trunk scanning.  
1. Press TRUNK. The numbers for all banks flash,  
along with BANKand TRUNK.  
2. Use the number keys to enter the number for the  
trunked bank you want to scan, then press SRC.  
The scanner searches for a data channel. When  
the scanner finds it, it begins trunk tracking.  
If you entered all of the trunk’s frequencies, you  
should be able to follow conversations between  
broadcasters even when they change frequen-  
cies. IDs, which represent different service  
groups, appear.  
ID  
3. To return to conventional scanning, press TRUNK  
again.  
 
43  
Hint: While scanning, you will not know exactly who  
the IDs are assigned to until you listen awhile or until  
you locate ID lists in frequency guides or on internet  
sites such as www.trunkscanner.com. Within a few  
minutes, you can usually figure out if what you are lis-  
tening to is a police, fire, or emergency medical 2-way  
radio user. Other IDs might take some time, but deter-  
mining who each ID represents is half the fun of trunk  
tracking!  
Monitoring an Active ID  
When the scanner stops on a transmission, you can  
hold the scanner on that transmission.  
1. Press HOLD. HOLD appears and the scanner  
stays on the current ID.  
2. If you want to listen to a different ID, use the num-  
ber keys to enter the ID you want to hold.  
3. Press HOLD again. HOLDand the channel number  
flash and the scanner monitors that ID.  
4. When you want to stop the hold and resume  
searching for a data channel so you can continue  
trunk tracking, press SRC.  
Note: You can also follow these steps to hold on an ID  
while scanning a scan list. See “Scan Lists” on  
Page 48.  
Temporarily Storing an ID into the Monitor  
ID Memory  
1. When your scanner stops on an ID you want to  
store, press MON/CLEAR. The scanner stores the  
ID into the monitor ID memory.  
2. Press SRC to resume searching.  
Note: To program the ID stored in the monitor ID mem-  
ory into the ID scan list, see “Scan Lists” on Page 48.  
 
44  
Locking Out IDs  
As with conventional scanning, it is possible to lock out  
unwanted traffic. This is particularly important in trunk-  
ed systems because signals you cannot listen to (such  
as water meters, door alarms, traffic signals, and en-  
crypted signals) are assigned IDs just like other users.  
You can have up to 100 IDs locked out at one time.  
Note: If you lock out an ID while searching, it is also  
locked out of the scan list(s). See “Scan Lists” on  
Page 48.  
To lock out an ID, press L-OUT when the ID appears.  
The ID is locked out, and the next active ID appears.  
Unlocking a Single ID  
1. Hold down L-OUT until you hear two short beeps.  
2. Repeatedly press t or s to select the ID you want to  
unlock.  
3. Press L-OUT.  
The ID is unlocked, and the next locked ID or  
–– ––(if there are no other locked IDs) appears.  
4. Press SRC to continue the scanner’s previous func-  
tion.  
Unlocking All IDs  
Hold down L-OUT until you hear two short beeps. Then  
press E to unlock all the IDs at once. The scanner  
beeps twice.  
Note: When you unlock all the IDs, the scan list ap-  
pears. Press SCAN to scan the IDs stored in your scan  
lists or press SRC to continue the scanner’s previous  
function. For more information about scan lists, see  
“Scan Lists” on Page 48.  
 
45  
Using Trunk Tracking Scan Delay  
Many trunked systems have a period of 2 or more sec-  
onds between a query and a reply. You can program a  
5-second delay to hold on an ID for 5 seconds to wait  
for a reply. The scanner continues to monitor the fre-  
quency for 5 seconds after the transmission stops be-  
fore resuming scanning.  
Press DELAY to turn trunk tracking scan delay on or off.  
DLYappears when trunk tracking scan delay is set.  
Note: If you consistently miss responses even with  
trunk tracking scan delay set, you might need to  
change the default system type or the fleet map you  
are using. See “Scanning Type I and Hybrid Trunked  
Systems” on Page 50.  
Monitoring IDs  
You can use your scanner’s display to monitor the fre-  
quencies in a trunked system for activity. You cannot  
hear conversations in this mode, but this is an excellent  
way to determine which talk groups are the most ac-  
tive. To set the scanner to monitor IDs, hold down  
MON/CLEAR until SEARCH and the channel number  
flash, and all active talk group IDs appear in quick suc-  
cession. To stop monitoring IDs, press SRC again.  
Note: When you monitor IDs, locked-out IDs also ap-  
pear.  
 
46  
CHANNEL ACTIVITY BARS  
Your scanner has 20 channel activity indicators (bars)  
which show the activity taking place on a trunked sys-  
tem. You can see how many frequencies are being  
used and generally monitor how much communication  
traffic is occurring.  
Each frequency you store in a trunking bank has a cor-  
responding activity bar. However, since there are only  
20 bars, but you can store up to 30 frequencies, some  
bars might indicate more than one frequency if the  
trunked system you are scanning has more than 20  
channels.  
• The bar that remains on steadily even when there  
are no current transmissions represents the fre-  
quency being used as the data channel.  
• The bar that flashes when an ID appears repre-  
sents the frequency being used by the radio to  
transmit what you are currently hearing.  
• If a bar turns on but you do not hear a conversa-  
tion, the channel is probably being used for a tele-  
phone interconnect call or a private call, or the bar  
might be a locked-out ID. Your scanner does not  
monitor these types of calls.  
BANK  
2
• If the scanner is holding on an ID which is not  
active, the other activity bars turn on and off as  
other groups use the system.  
 
47  
SCAN LISTS  
When you program trunked frequencies into a bank  
(see “Storing Trunked Frequencies” on Page 41), your  
scanner sets up 5 scan lists into which you can store  
your favorite IDs. Each list can contain up to 10 IDs, so  
you can store a total of 50 IDs for each trunk tracking  
bank (250 IDs if you use all banks as trunking banks!).  
Scan lists help you organize trunking system users into  
categories. For example, you might use List 1 for police  
IDs, List 2 for fire department IDs, List 3 for emergency  
medical service IDs, and so on. Once IDs are stored in  
lists, you can scan them like you scan conventional  
channels. You can program IDs into scan lists manual-  
ly, during a search, or automatically.  
Manually Storing IDs into Scan Lists  
1. Select the trunking bank you want (see “Scanning  
a Trunked Bank” on Page 43).  
2. After the scanner begins trunk tracking, press  
MAN. A number showing the current scan list  
appears steadily at the top of the display, and bars  
which show activity in other banks appear.  
3. Press MAN then repeatedly press s or t to select  
the ID scan list location (shown at the top of the  
display) where you want to store an ID. Then,  
press PROG to select the ID you want to store.  
ID Scan List  
4. Enter the Type II ID you want to store, then press  
E.  
 
48  
Or, to enter a Type I ID:  
a. Use the number keys to enter the block number  
and fleet number, then press .  
b. Enter the subfleet number, then press E.  
Note: To clear a mistake while entering an ID,  
press 0 then E, then start over at Step 1.  
5. Repeatedly press PROG or s to select the next  
scan list location you want to program. Then repeat  
Step 4 to enter another ID.  
Moving IDs to Scan Lists  
1. Press MAN. MANappears.  
2. Select the ID scan list location where you want to  
store the IDs. Then press PROG. PGMappears.  
3. Press MON/CLEAR. A monitor ID appears.  
4. Press E. The scanner stores the IDs into the  
selected ID scan lists.  
Deleting a Stored ID  
1. Press PROG. PGMappears.  
2. Repeatedly press s or t to select the scan list loca-  
tion (shown at the top of the display) you want to  
delete.  
3. Press 0 then E.  
 
49  
SCANNING THE SCAN LISTS  
Press SCAN to begin scanning the lists you have  
stored.  
Note:  
If you have not stored any IDs, SCANscrolls on  
the display, but your scanner does not stop on an ac-  
tive conversation.  
To remove a scan list from active scanning, use the  
number keys to enter the scan list’s number. The scan  
list number turns off, and the IDs in that list are not  
scanned.  
Note:  
One scan list must always be active. You cannot  
remove all of the scan lists.  
To restore a scan list to active scanning, use the num-  
ber keys to enter its number again.  
Press SRC to return to the scanner’s previous function.  
SCANNING TYPE I AND HYBRID  
TRUNKED SYSTEMS  
Your PRO-91 is set to scan Type II user IDs by default.  
When you scan trunked frequencies, each Type II user  
ID you see appears as an even number without a dash  
(such as 2160). Your PRO-91 can also scan Type I  
trunked systems. Each Type I ID appears as a three- or  
four-digit number, followed by a hyphen, followed by a  
one- or two-digit number (such as 200-14). If you no-  
tice a mix of odd- and even-user IDs (such as 6477,  
2160, 6481, 6144, and 1167), then you are probably  
monitoring either a Type I or hybrid (a combination of  
Type I and Type II user IDs) system (see “Types of  
Trunking Systems” on Page 39).  
You might also notice that you are missing responses  
when you hold on an active ID. Unlike Type II systems,  
Type I and hybrid systems require a fleet map that sets  
specific fleet-subfleet parameters. It is easy to select a  
fleet map to scan; what is not always easy is selecting  
or programming a map that is being used in your partic-  
ular area.  
 
50  
DATA  
4. Press  
again.  
5. Repeatedly press s or t to select the name of the  
map you want (such as E1P7). The prepro-  
grammed fleet map appears.  
6. Press E, then SRC. The scanner then searches for  
transmissions using the preset map you chose.  
Note: When the scanner searches for transmissions,  
you see Type I fleet and subfleet IDs such as 100-12,  
100-9, 000-12, or 400-8.  
How do you know if the preset map you selected is cor-  
rect? Listen to see if you are following complete conver-  
sations. If not, try another preset map.  
Programming a Fleet Map  
1. Set the scanner for conventional scanning, press  
PROG, then press TRUNK.  
2. Select the bank where you want to program the  
fleet map by pressing a number key.  
DATA  
3. Press  
.
4. Repeatedly press s or t to select E1, then press  
DATA  
. A preprogrammed fleet map appears.  
5. Repeatedly press s or t until USr appears. Then  
press E.  
DATA  
6. Press  
.
7. Repeatedly press s or t to select the size code for  
the first block, then press E. The next available  
block appears.  
Block  
8. Repeat Step 7 until you have selected a size code  
for each block you want to work with.  
 
51  
When a Type I system is designed, the address infor-  
mation for all its user IDs is divided into 8 equal-size  
blocks, numbered 0–7, and each block is assigned a  
size code. When you set up your scanner to track a  
Type I system, you must choose a size code for each  
block. When you have chosen a size code for all 8  
blocks, you will have duplicated the fleet map for the  
system you are tracking. If you have chosen correctly,  
you will be able to track transmissions in that system.  
Each size code defines the number of fleets, subfleets,  
and IDs each block has. For example, you can see in  
the following table that a size code of S-4 has one fleet,  
which is divided into 16 separate subfleets, and it has a  
total of 512 individual IDs.  
Size  
Fleets  
Subfleets  
IDs  
Blocks  
Used  
S-0  
Reserved block for Type II IDs  
S-1  
128  
16  
8
4
16  
1
1
1
1
1
1
1
1
1
1
1
2
4
8
S-2  
8
64  
S-3  
8
128  
512  
32  
S-4  
1
16  
4
S-5  
64  
32  
32  
16  
8
S-6  
8
32  
S-7  
4
64  
S-8  
4
128  
256  
256  
256  
1024  
2048  
4096  
S-9  
4
S-10  
S-11  
S-12  
S-13  
S-14  
4
8
2
16  
16  
16  
16  
1
1
1
Each ID in the block is unique. The left-most digit is the  
block number in the ID. The next two digits identify  
which fleet is active, and the last digit(s) (after the hy-  
phen) identifies the subfleet.  
 
52  
The size codes selected by a Type I system designer  
depend on the specific needs of the system's users.  
Some organizations might want many subfleets with  
only a few radios each, while another organization  
might want only a few subfleets, with many radios each.  
To scan Type I systems, you must select or program a  
fleet map with the same size code assignments as the  
trunked system. If you do this accurately, you will track  
all the fleet and subfleet combinations used by the sys-  
tem. In other words, you will hear complete communi-  
cations while monitoring a trunked system.  
Note: Preset fleet maps might be available at  
If you do not already know the size codes used, you will  
have to guess them. But since you do not have to figure  
out all the blocks at once, this is not as hard as it  
seems. Select a size code for a block, then press SRC.  
Now listen to the communications. If you decide you are  
receiving most of the replies to the conversations with  
IDs assigned to the block you just programmed, then  
you have probably selected the right size code and can  
work on the next block of the map.  
There are 16 preset fleet maps to choose from, and it is  
best to start with these when setting up a Type I or hy-  
brid trunk tracking bank. If none of the following preset  
fleet maps allow you to follow complete conversations,  
then you probably need to program your own fleet map  
(see “Programming a Fleet Map” on Page 51).  
E1P1  
Size  
E1P2  
Size  
E1P3  
Size  
Block  
Code  
S11  
S11  
S11  
S11  
S11  
S11  
S11  
S11  
Block  
Code  
Block  
Code  
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
S4  
0
1
2
3
4
5
6
7
S4  
S4  
S4  
S4  
S4  
S4  
S4  
S4  
S4  
S4  
S4  
S4  
S12  
(S12)  
S4  
 
53  
E1P4  
Size  
E1P5  
Size  
E1P6  
Size  
Block  
Code  
S12  
(S12)  
S4  
Block  
Code  
Block  
Code  
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
S4  
0
1
2
3
4
5
6
7
S3  
S4  
S10  
S4  
S12  
(S12)  
S4  
S4  
S4  
S4  
S12  
(S12)  
S12  
(S12)  
S4  
S4  
S4  
S4  
S4  
S4  
E1P7  
E1P8  
E1P9  
Size  
Code  
Size  
Code  
Size  
Code  
Block  
Block  
Block  
0
1
2
3
4
5
6
7
S10  
S10  
S11  
S4  
0
1
2
3
4
5
6
7
S1  
S1  
S2  
S2  
S3  
S3  
S4  
S4  
0
1
2
3
4
5
6
7
S4  
S4  
S0  
S0  
S0  
S0  
S0  
S0  
S4  
S4  
S4  
S4  
E1P10  
E1P11  
E1P12  
Size  
Code  
Size  
Code  
Size  
Code  
Block  
Block  
Block  
0
1
2
3
4
5
6
7
S0  
S0  
S0  
S0  
S0  
S0  
S4  
S4  
0
1
2
3
4
5
6
7
S4  
S0  
S0  
S0  
S0  
S0  
S0  
S0  
0
1
2
3
4
5
6
7
S0  
S0  
S0  
S0  
S0  
S0  
S0  
S4  
 
54  
E1P13  
Size  
E1P14  
Size  
Block  
Code  
Block  
Code  
0
1
2
3
4
5
6
7
S3  
0
1
2
3
4
5
6
7
S4  
S3  
S3  
S11  
S4  
S10  
S4  
S4  
S4  
S0  
S4  
S0  
S12  
S12  
S0  
E1P15  
E1P16  
Size  
Code  
Size  
Code  
Block  
Block  
0
1
2
3
4
5
6
7
S4  
0
1
2
3
4
5
6
7
S3  
S4  
S10  
S10  
S11  
S0  
S4  
S11  
S11  
S0  
S0  
S12  
S12  
S12  
S12  
Selecting a Preset Fleet Map  
1. Set the scanner for conventional scanning, press  
PROG, then press TRUNK.  
2. Select the bank where you want to store the preset  
fleet map by pressing a number key.  
DATA  
3. Press  
.
4. Repeatedly press s or t to select E1. Then, when  
E1flashes, press E.  
 
55  
9. Press SRC. The scanner exits the trunking pro-  
gramming mode, tunes the data channel, then  
begins to search using the map you programmed.  
Note: If you select size code S-12, S-13, or S-14, these  
restrictions apply:  
• S-12 can only be assigned to Blocks 0, 2, 4, or 6.  
• S-13 can only be assigned to Blocks 0 and 4.  
• S-14 can only be assigned to Block 0.  
Since these size codes require multiple blocks, you will  
be prompted for the next available block when pro-  
gramming a fleet map. For example, if you assign  
Block 0 as an S-12, the scanner prompts you for b2,  
the next block available, instead of b1. And if you as-  
sign Block 0 as an S-14, you would not see another  
prompt because it uses all available blocks.  
Programming a Hybrid System  
A hybrid system is simply a Type I system with some of  
its blocks designated as Type II blocks. To program a  
hybrid system, follow the steps listed in “Programming  
a Fleet Map” on Page 51. However, if you want a block  
to be Type II, select size code S-0in Step 7.  
 
56  
A GENERAL GUIDE TO SCANNING  
Reception of the frequencies covered by your scanner  
is mainly “line-of-sight.” That means you usually cannot  
hear stations that are beyond the horizon.  
GUIDE TO FREQUENCIES  
National Weather Frequencies  
162.400  
162.425  
162.450  
162.475  
162.500  
162.525  
162.550  
Canadian Weather Frequencies  
161.650  
161.775  
163.275  
Note:  
These frequencies are not preprogrammed in the  
weather service bank but can be manually programmed  
into a channel.  
Birdie Frequencies  
Every scanner has birdie frequencies. Birdies are sig-  
nals created inside the scanner’s receiver. These oper-  
ating frequencies might interfere with broadcasts on the  
same frequencies. If you program one of these frequen-  
cies, you hear only noise on that frequency. If the inter-  
ference is not severe, you might be able to turn  
SQUELCH clockwise to cut out the birdie.  
This scanner’s birdie frequencies (in MHz) are:  
31.2000  
138.7150  
171.2500  
413.1750  
426.0500  
455.7750  
489.2500  
813.4000  
41.6000  
145.6000  
406.2250  
413.2250  
435.9500  
465.6750  
495.4000  
820.9500  
52.0000  
148.6200  
407.7625  
416.1375  
455.7625  
475.5875  
505.3000  
822.3625  
138.7100  
165.3000  
407.8125  
426.0375  
455.8625  
485.4875  
505.3125  
899.2375  
 
57  
GUIDE TO THE ACTION BANDS  
Typical Band Usage  
VHF Band  
Low Range  
29.00–50.00 MHz  
6-Meter Amateur  
U.S. Government  
2-Meter Amateur  
High Range  
50.00–54.00 MHz  
137.00–144.00 MHz  
144.00–148.00 MHz  
148.00–174.00 MHz  
UHF Band  
U.S. Government  
70-cm Amateur  
Low Range  
FM-TV Audio Broadcast, Wide  
Band  
406.00–420.00 MHz  
420.00–450.00 MHz  
450.00–470.00 MHz  
470.00–512.00 MHz  
Public Service  
806.00–823.93 MHz  
851.00–856.00 MHz  
856.00–861.00 MHz  
Conventional Systems  
Conventional/Trunked Sys-  
tems  
Trunked Systems  
Public Safety  
High Range  
33-Centimeter Amateur  
Private Trunked  
General Trunked  
Fixed Services  
861.00–866.00 MHz  
866.00–868.93 MHz  
896.11–902.00 MHz  
902.00–928.00 MHz  
935.00–940.00 MHz  
940.00–941.00 MHz  
941.00–944.00 MHz  
944.00–952.00 MHz  
Studio-to-Transmitter Broad-  
cast Links  
Private Fixed Services, Paging  
952.00–956.00 MHz  
Primary Usage  
As a general rule, most of the radio activity is concen-  
trated on the following frequencies:  
VHF Band  
Activities  
Frequencies  
Government, Police, and Fire  
Emergency Services  
Railroad  
153.785–155.980 MHz  
158.730–159.460 MHz  
160.000–161.900 MHz  
 
58  
UHF Band  
Activities  
Frequencies  
Land-Mobile “Paired” Fre-  
quencies  
450.000–470.000 MHz  
Base Stations  
Mobile Units  
451.025–454.950 MHz  
456.025–459.950 MHz  
460.025–464.975 MHz  
465.025–469.975 MHz  
Repeater Units  
Control Stations  
Note: Remote control stations and mobile units operate  
at 5 MHz higher than their associated base stations and  
relay repeater units.  
BAND ALLOCATION  
To help decide which frequency ranges to scan, use the  
following listing of the typical services that use the fre-  
quencies your scanner receives. These frequencies are  
subject to change, and might vary from area to area.  
For a more complete listing, refer to the “Police Call Ra-  
dio Guide including Fire and Emergency Services,”  
available at your local RadioShack store.  
Abbreviations  
Services  
BIFC . . . . . . . . . . . . . . . . . Boise (ID) Interagency Fire Cache  
BUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Business  
CAP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Civil Air Patrol  
CB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Citizens Band  
CCA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Common Carrier  
CSB . . . . . . . . . . . . . . . . . . . . . . . . . . . Conventional Systems  
CTSB. . . . . . . . . . . . . . . . . . . Conventional/Trunked Systems  
FIRE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fire Department  
HAM. . . . . . . . . . . . . . . . . . . . . . . . . . . .Amateur (Ham) Radio  
GOVT . . . . . . . . . . . . . . . . . . . . . . . . . . .Federal Government  
GMR . . . . . . . . . . . . . . . . . . . . . . . . . . .General Mobile Radio  
GTR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .General Trunked  
IND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Industrial Services  
. . . (Manufacturing, Construction, Farming, Forest Products)  
MAR. . . . . . . . . . . . . . . . . . . . . . . . . . . Military Amateur Radio  
MARI . . . . . . . . . . . . . . . . . . . . . . . . . .Maritime Limited Coast  
. . . . . . . . . . . . . . . . . . . . . (Coast Guard, Marine Telephone,  
. . . . . . . . . . . . . . . . . . . . .Shipboard Radio, Private Stations)  
MARS . . . . . . . . . . . . . . . . . . . Military Affiliate Radio System  
MED. . . . . . . . . . . . . . . . . . . . . . Emergency/Medical Services  
MIL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . U.S. Military  
MOV . . . . . . . . . . . . . . . . . . . . .Motion Picture/Video Industry  
NEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . New Mobile Narrow  
NEWS . . . . . . . . . . . . . . Relay Press (Newspaper Reporters)  
OIL. . . . . . . . . . . . . . . . . . . . . . . . . . . . Oil/Petroleum Industry  
POL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Police Department  
PUB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Public Services  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-b.uP(  
lic Safety, Local Government, Forestry Conservation)  
PSB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Public Safety  
PTR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Private Trunked  
 
59  
ROAD . . . . . . . . . . . . . . . . . . . Road & Highway Maintenance  
RTV. . . . . . . . . . . . . . . . .Radio/TV Remote Broadcast Pickup  
TAXI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Taxi Services  
TELB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mobile Telephone  
(Aircraft, Radio Common Carrier, Landline Companies)  
TELC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cordless Phones  
TELM . . . . . . . . . . . . . . . . . . . . . . . . Telephone Maintenance  
TOW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tow Trucks  
TRAN . . . . . . . . . . . . . . . . . . . . . . . . .Transportation Services  
(Trucks, Tow Trucks, Buses, Railroad, Other)  
TSB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Trunked Systems  
TVn . . . . . . . . . . . . . . . . . . . . . . . . . . FM-TV Audio Broadcast  
USXX . . . . . . . . . . . . . . . . . . . . . . . . . Government Classified  
UTIL . . . . . . . . . . . . . . . . . . . . . . . . . . Power & Water Utilities  
WTHR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Weather  
VERY HIGH FREQUENCY (VHF)  
VHF Low Band—(29–50 MHz—in 5 kHz steps)  
29.000–29.700 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HAM  
29.900–30.550 . . . . . . . . . . . . . . . . . . . . . . . . . . . .GOVT, MIL  
30.580–31.980 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .IND, PUB  
32.000–32.990 . . . . . . . . . . . . . . . . . . . . . . . . . . . .GOVT, MIL  
33.020–33.980 . . . . . . . . . . . . . . . . . . . . . . . . BUS, IND, PUB  
34.010–34.990 . . . . . . . . . . . . . . . . . . . . . . . . . . . .GOVT, MIL  
35.020–35.980 . . . . . . . . . . . . . . . . . . BUS, PUB, IND, TELM  
36.000–36.230 . . . . . . . . . . . . . . . . . . . . . . . . . . . .GOVT, MIL  
36.250. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oil Spill Cleanup  
36.270–36.990 . . . . . . . . . . . . . . . . . . . . . . . . . . . .GOVT, MIL  
37.020–37.980 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .PUB, IND  
38.000–39.000 . . . . . . . . . . . . . . . . . . . . . . . . . . . .GOVT, MIL  
39.020–39.980 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PUB  
40.000–42.000 . . . . . . . . . . . . . . . . . . . . . . GOVT, MIL, MARI  
42.020–42.940 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . POL  
42.960–43.180 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IND  
43.220–43.680 . . . . . . . . . . . . . . . . . . . . . . . TELM, IND, PUB  
43.700–44.600 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TRAN  
44.620–46.580 . . . . . . . . . . . . . . . . . . . . . . . . . . . . POL, PUB  
46.600–46.990 . . . . . . . . . . . . . . . . . . . . . . . . . . GOVT, TELC  
47.020–47.400 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PUB  
47.420. . . . . . . . . . . . . . . . . . . . . . . . . . . American Red Cross  
47.440–49.580 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .IND, PUB  
49.610–49.990 . . . . . . . . . . . . . . . . . . . . . . . . . . . . MIL, TELC  
6-Meter Amateur Band—(50–54 MHz)  
50.00–54.00 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HAM  
Aircraft Band—(108–137 MHz)  
108.00–121.490 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AIR  
121.500. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AIR Emergency  
121.510–136.000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AIR  
U.S. Government Band (137–144 MHz)  
137.000–144.000 . . . . . . . . . . . . . . . . . . . . . . . . . .GOVT, MIL  
2-Meter Amateur Band (144–148 MHz)  
144.000–148.000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HAM  
VHF High Band (148–174 MHz)  
148.050–150.345 . . . . . . . . . . . . . . . . . . . . . . CAP, MAR, MIL  
150.775–150.790 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MED  
150.815–150.980 . . . . . . . . . . . . . . . . TOW, Oil Spill Cleanup  
150.995–151.475 . . . . . . . . . . . . . . . . . . . . . . . . .ROAD, POL  
151.490–151.955 . . . . . . . . . . . . . . . . . . . . . . . . . . .IND, BUS  
151.985. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TELM  
 
60  
152.0075 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MED  
152.030–152.240 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TELB  
152.270–152.480 . . . . . . . . . . . . . . . . . . . . . IND, TAXI, BUS  
152.510–152.840 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TELB  
152.870–153.020 . . . . . . . . . . . . . . . . . . . . . . . . . . IND, MOV  
153.035–153.725 . . . . . . . . . . . . . . . . . . . . . . IND, OIL, UTIL  
153.740–154.445 . . . . . . . . . . . . . . . . . . . . . . . . . PUB, FIRE  
154.490–154.570 . . . . . . . . . . . . . . . . . . . . . . . . . . IND, BUS  
154.585 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oil Spill Cleanup  
154.600–154.625 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BUS  
154.655–156.240 . . . . . . . . . . . . . . .MED, ROAD, POL, PUB  
156.255–157.425 . . . . . . . . . . . . . . . . . . . . . . . . . .OIL, MARI  
157.450 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MED  
157.470–157.515 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TOW  
157.530–157.725 . . . . . . . . . . . . . . . . . . . . . . . . . . IND, TAXI  
157.740 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BUS  
157.770–158.100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TELB  
158.130–158.460 . . . . . . . . . . . .BUS, IND, OIL, TELM, UTIL  
158.490–158.700 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TELB  
158.730–159.465 . . . . . . . . . . . . . . . . . . . .POL, PUB, ROAD  
159.480 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OIL  
159.495–161.565 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TRAN  
161.580–162.000 . . . . . . . . . . . . . . . . . . . . . OIL, MARI, RTV  
162.0125–162.35 . . . . . . . . . . . . . . . . . . . GOVT, MIL, USXX  
162.400–162.550 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .WTHR  
162.5625–162.6375 . . . . . . . . . . . . . . . . . GOVT, MIL, USXX  
162.6625 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MED  
162.6875–163.225 . . . . . . . . . . . . . . . . . . GOVT, MIL, USXX  
163.250 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MED  
163.275–166.225 . . . . . . . . . . . . . . . . . . . GOVT, MIL, USXX  
166.250 . . . . . . . . . . . . . . . . . . . . . . . . . . . .GOVT, RTV, FIRE  
166.275–169.400 . . . . . . . . . . . . . . . . . . . . . . . . GOVT, BIFC  
169.445–169.505 . . . . . . . . . . . . . . . . Wireless Mikes, GOVT  
169.55–169.9875 . . . . . . . . . . . . . . . . . . . GOVT, MIL, USXX  
170.000–170.150 . . . . . . . . . . . . . . .BIFC, GOVT, RTV, FIRE  
170.175–170.225 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GOVT  
170.245–170.305 . . . . . . . . . . . . . . . . . . . . . . Wireless Mikes  
170.350–170.400 . . . . . . . . . . . . . . . . . . . . . . . . . GOVT, MIL  
170.425–170.450 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BIFC  
170.475 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PUB  
170.4875–173.175 . . . . . . . . . . GOVT, PUB, Wireless Mikes  
173.225–173.5375 . . . . . . . . . . . . . . MOV, NEWS, UTIL, MIL  
173.5625–173.5875 . . . . . . . . . . . .MIL Medical/Crash Crews  
173.60–173.9875 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GOVT  
ULTRA HIGH FREQUENCY (UHF)  
U. S. Government Band (406–420 MHz)  
406.125–419.975 . . . . . . . . . . . . . . . . . . . . . . . GOVT, USXX  
70-cm Amateur Band (420–450 MHz)  
420.000–450.000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HAM  
Low Band (450–470 MHz)  
450.050–450.925 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .RTV  
451.025–452.025 . . . . . . . . . . . . . . . . IND, OIL, TELM, UTIL  
452.0375–453.00 . . . . . . . . . IND, TAXI, TRAN TOW, NEWS  
453.0125–454.000 . . . . . . . . . . . . . . . . . . . . . . . . . .PUB, OIL  
454.025–454.975 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TELB  
455.050–455.925 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .RTV  
457.525–457.600 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BUS  
458.025–458.175 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MED  
460.0125–460.6375 . . . . . . . . . . . . . . . . . . .FIRE, POL, PUB  
460.650–462.175 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BUS  
462.1875–462.450 . . . . . . . . . . . . . . . . . . . . . . . . . BUS, IND  
462.4625–462.525 . . . . . . . . . . . . . . . IND, OIL, TELM, UTIL  
462.550–462.925 . . . . . . . . . . . . . . . . . . . . . . . . . GMR, BUS  
 
61  
462.9375–463.1875 . . . . . . . . . . . . . . . . . . . . . . . . . . . . MED  
463.200–467.925 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BUS  
FM-TV Audio Broadcast, UHF Wide Band (470–512 MHz)  
(Channels 14 through 69 in 6 MHz steps)  
475.750. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Channel 14  
481.750. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Channel 15  
487.750. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Channel 16  
.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
511.750 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Channel 20  
Note: Some cities use the 470–512 MHz band for land/  
mobile service.  
Conventional Systems Band – Locally Assigned  
851.0125–855.9875 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .CSB  
Conventional/Trunked Systems Band – Locally Assigned  
856.0125–860.9875 . . . . . . . . . . . . . . . . . . . . . . . . . . . .CTSB  
Trunked Systems Band – Locally Assigned  
861.0125–865.9875 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TSB  
Public Safety Band – Locally Assigned  
866.0125–868.9875 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .PSB  
33-Centimeter Amateur Band (902–928 MHz)  
902.0000–928.0000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . HAM  
Private Trunked  
935.0125–939.9875 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PTR  
General Trunked  
940.0125–940.9875 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .GTR  
FREQUENCY CONVERSION  
The tuning location of a station can be expressed in  
frequency (kHz or MHz) or in wavelength (meters). The  
following information can help you make the necessary  
conversions.  
1 MHz (million) = 1,000 kHz (thousand)  
To convert MHz to kHz, multiply the number of mega-  
hertz by 1,000:  
9.62 (MHz) x 1000 = 9620 kHz  
To convert from kHz to MHz, divide the number of kilo-  
hertz by 1,000:  
2780 (kHz) ÷ 1000 = 2.780 MHz  
To convert MHz to meters, divide 300 by the number of  
megahertz:  
300 ÷ 7.1 MHz = 42.25 meters  
 
62  
TROUBLESHOOTING  
If you have problems, here are some suggestions that  
might help. If they do not, take your scanner to your  
local RadioShack store for assistance.  
POSSIBLE  
CAUSE  
PROBLEM  
REMEDY  
Scanner is on but  
will not scan.  
SQUELCH is not  
adjusted cor-  
rectly.  
Turn SQUELCH  
clockwise.  
Only one channel Store frequencies  
or no channels  
are stored.  
into more than  
one channel.  
Scanner is totally  
inoperative.  
No power.  
Check the batter-  
ies or make sure  
the AC adapter or  
DC adapter is  
connected prop-  
erly.  
Recharge the  
rechargeable bat-  
teries or replace  
the non-recharge-  
able batteries.  
The AC adapter  
or DC adapter is  
not connected.  
Be sure the  
adapter’s barrel  
plug is fully  
plugged into the  
POWER jack.  
The scanner’s  
display dims or  
the scanner  
Batteries are not  
correctly  
installed.  
Make sure the  
batteries are  
installed properly.  
sounds a tone  
every 15 30 sec-  
onds.  
The batteries are  
weak.  
Recharge the  
rechargeable bat-  
teries or replace  
the non-recharge-  
able batteries.  
Keypad does not  
work.  
The keylock func- To turn off the  
tion is activated.  
keylock, press  
KEYLOCK until  
disappears.  
K/L  
The batteries are  
weak.  
Recharge the  
BATT.Lo  
flashes.  
rechargeable bat-  
teries or replace  
the non-recharge-  
able batteries.  
 
63  
POSSIBLE  
CAUSE  
PROBLEM  
PROBLEM  
REMEDY  
REMEDY  
POSSIBLE  
CAUSE  
An antenna is not  
connected or  
connected incor-  
rectly.  
Make sure an  
antenna is con-  
nected to the  
scanner.  
Programming  
error.  
Re-enter the fre-  
quency correctly,  
including the deci-  
mal point.  
Error  
appears.  
The scanner  
Stored frequen-  
Avoid storing fre-  
locks on frequen- cies are the same quencies listed  
cies that have an  
unclear transmis- quencies.  
sion.  
as “birdie” fre-  
under “Birdie Fre-  
quencies” on  
Page 57 or only  
listen to them  
manually.  
Scanner will not  
track a trunked  
system.  
The transmis-  
sion might not  
use a system that  
can be tracked by  
your scanner.  
Scan another  
transmission.  
The data fre-  
quency is miss-  
ing.  
Find the data fre-  
quency (see  
“Storing Trunked  
Frequencies” on  
Page 41).  
The system you  
are trying to track  
is a Type I sys-  
tem, and the  
scanner is set to  
scan Type II sys-  
tems.  
Set the scanner to  
receive Type I  
trunked frequen-  
cies. See “Scan-  
ning Type I and  
Hybrid Trunked  
Systems” on  
Page 50.  
Scanner is set to  
receive Type I  
trunked frequen-  
cies, but does  
not scan them.  
The fleet map  
you have select-  
ed or entered  
might be incor-  
rect.  
Check the fleet  
map and correct it  
if necessary (see  
“Scanning Type I  
and Hybrid  
Trunked Sys-  
tems” on Page 50  
and “Program-  
ming a Fleet Map”  
on Page 51).  
 
64  
POSSIBLE  
CAUSE  
PROBLEM  
REMEDY  
Scanner will not  
stop while scan-  
ning a scan list.  
No IDs have  
been stored.  
Store one or more  
IDs (see “Scan  
Lists” on Page 48.  
The IDs you have Scan another  
stored are not  
active.  
transmission.  
Scanner will not  
acquire a data  
channel.  
is not  
Adjust squelch for  
SQUELCH  
correctlyadjusted trunk tracking.  
for trunk tracking. See “Setting  
Squelch for the  
Trunk Tracking  
Mode” on  
Page 41.  
The frequency  
used for the data  
channel is miss-  
ing.  
Press SRC to  
search for the  
data channel (see  
“Storing Trunked  
Frequencies” on  
Page 41).  
Missing replies to The system you  
Set the scanner to  
receive Type I  
trunked frequen-  
cies. See “Scan-  
ning Type I and  
Hybrid Trunked  
Systems” on  
conversations.  
are trying to track  
is a Type I sys-  
tem, and the  
scanner is set to  
scan Type II sys-  
tems.  
Page 50.  
The selected  
Try another preset  
fleet map is incor- fleet map or pro-  
rect.  
gram your own  
fleet map (see  
“Scanning Type I  
and Hybrid  
Trunked Sys-  
tems” on  
Page 50).  
Missing replies to Not all of the  
Enter all of the  
conversations  
(continued)  
trunk’s frequen-  
cies have been  
entered.  
trunk’s frequen-  
cies (see “Storing  
Trunked Frequen-  
cies” on Page 41).  
 
65  
POSSIBLE  
CAUSE  
PROBLEM  
REMEDY  
Channel activity  
bars are flashing  
but no sound is  
heard.  
The transmis-  
Scan for another  
transmission.  
sion might be a  
private or tele-  
phone intercon-  
nect call. The  
scanner does not  
scan these types  
of transmissions.  
The ID shown is  
not active.  
Wait for the ID to  
become active, or  
scan another  
transmission.  
RESETTING THE SCANNER  
If the scanner’s display locks up or does not work prop-  
erly, you might need to reset the scanner.  
Caution:  
This procedure clears all the information you  
have stored into the scanner. Before you reset the  
scanner, try turning it off and on to see if it begins work-  
ing properly. Reset the scanner only when you are sure  
it is not working properly.  
1. Turn off the scanner.  
2. While you hold down the 2 and 9 keys, turn on the  
scanner. CLEAR flashes for about 8 seconds as  
the scanner clears its memory.  
Note:  
Do not turn off the scanner until CLEAR stops  
flashing. Otherwise, the scanner might not clear its  
memory properly.  
 
66  
CARE AND MAINTENANCE  
Your RadioShack PRO-91 150-Channel Handheld  
Trunking Scanner is an example of superior design and  
craftsmanship. The following suggestions will help you  
care for your scanner so you can enjoy it for years.  
Keep the scanner dry. If it gets wet, wipe  
it dry immediately. Liquids can contain  
minerals that can corrode the electronic  
circuits.  
Use only batteries of the recommended  
size and type. Always remove old and  
weak batteries. They can leak chemicals  
that destroy electronic circuits.  
Handle the scanner gently and carefully.  
Dropping it can damage circuit boards  
and cases and can cause the scanner to  
work improperly.  
Use and store the scanner only in normal  
temperature environments. Temperature  
extremes can shorten the life of electron-  
ic devices, damage batteries, and distort  
or melt plastic parts.  
Keep the scanner away from dust and  
dirt, which can cause premature wear of  
parts.  
Wipe the scanner with a damp cloth oc-  
casionally to keep it looking new. Do not  
use harsh chemicals, cleaning solvents,  
or strong detergents to clean the scan-  
ner.  
Modifying or tampering with the scanner’s internal com-  
ponents can cause a malfunction, invalidate your scan-  
ner’s warranty and void your FCC authorization to  
operate it. If your scanner is not operating as it should,  
take it to your local RadioShack store for assistance.  
 
67  
SPECIFICATIONS  
Frequency Coverage: ..... 29–54 MHz (in 5 kHz steps)  
108–136.975 MHz (in 12.5 kHz steps)  
137–174 MHz (in 5 kHz steps)  
406–512 MHz (in 12.5 kHz steps)  
806.0000–823.9375 MHz (in 12.5 kHz steps)  
851.0000–868.9875 MHz (in 12.5 kHz steps)  
896.1125–956.0000 MHz (in 12.5 kHz steps)  
Monitor Channels 5  
Number of Banks 5  
Sensitivity (AM/FM):  
NFM: 20 dB S/N at 3 kHz deviation):  
29–54 MHz 0.5 µV  
137–174 MHz 0.4 µV  
406–512 MHz 0.4 µV  
806–956 MHz 0.6 µV  
AM: 20 dB S/N at 60% modulation):  
108–136.9875 MHz 1.5 µV  
Spurious Rejection (at 40.84 MHz) 50 dB  
Selectivity:  
10 kHz –6 dB  
15 kHz –50 dB  
IF Rejection (at 162.4 MHz) 80 dB  
Channels ............................................................... 150  
Operating Temperature .... –4 to 140 F (–20 to 60 C)  
°
°
Scan Speed ............................... 50 Channels/Second  
Search Speed:  
Normal ....................................... 100 Steps/Second  
Hypersearch .............................. 300 Steps/Second  
Service .............................. 50 Frequencies/Second  
Priority Sampling ........................................ 2 Seconds  
Delay Time ................................................. 2 Seconds  
IF Frequencies 380.7 MHz, 10.85 MHz, and 450 kHz  
Antenna Impedance 50 Ohms  
Audio Output ................................. 350 mW maximum  
Built-in Speaker ...............17/16 Inches (36 mm) 8 Ohm,  
Dynamic Type  
Maximum Current Drain .................................. 180 mA  
 
68  
Power Requirement:  
4 AA Alkaline Batteries (6.0 VDC),  
or 4 AA Rechargeable Ni-Cd Batteries (4.8 VDC),  
or AC Adapter (Cat. No. 273-1665),  
or DC Adapter (Cat. No. 270-1560)  
Current Drain:  
Squelched .................................................. 70 mA  
Full Output ............................................... 180 mA  
Dimensions (HWD) ............... 61/4 × 21/2 × 19/16 Inches  
(158 × 63 × 40 mm)  
Weight (without antenna, batteries, belt clip) ..... 8.1 oz  
(229 g)  
Specifications are typical; individual units might vary.  
Specifications are subject to change and improvement  
without notice.  
 
69  
NOTES  
 
70  
 
71  
Limited One-Year Warranty  
This product is warranted by RadioShack against manufacturing de-  
fects in material and workmanship under normal use for one (1) year  
from the date of purchase from RadioShack company-owned stores  
and authorized RadioShack franchisees and dealers. EXCEPT AS  
PROVIDED HEREIN, RadioShack MAKES NO EXPRESS WAR-  
RANTIES AND ANY IMPLIED WARRANTIES, INCLUDING THOSE  
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PUR-  
POSE, ARE LIMITED IN DURATION TO THE DURATION OF THE  
WRITTEN LIMITED WARRANTIES CONTAINED HEREIN. EXCEPT  
AS PROVIDED HEREIN, RadioShack SHALL HAVE NO LIABILITY  
OR RESPONSIBILITY TO CUSTOMER OR ANY OTHER PERSON  
OR ENTITY WITH RESPECT TO ANY LIABILITY, LOSS OR DAM-  
AGE CAUSED DIRECTLY OR INDIRECTLY BY USE OR PERFOR-  
MANCE OF THE PRODUCT OR ARISING OUT OF ANY BREACH  
OF THIS WARRANTY, INCLUDING, BUT NOT LIMITED TO, ANY  
DAMAGES RESULTING FROM INCONVENIENCE, LOSS OF TIME,  
DATA, PROPERTY, REVENUE, OR PROFIT OR ANY INDIRECT,  
SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, EVEN  
IF RadioShack HAS BEEN ADVISED OF THE POSSIBILITY OF  
SUCH DAMAGES.  
Some states do not allow the limitations on how long an implied war-  
ranty lasts or the exclusion of incidental or consequential damages,  
so the above limitations or exclusions may not apply to you.  
In the event of a product defect during the warranty period, take the  
product and the RadioShack sales receipt as proof of purchase date  
to any RadioShack store. RadioShack will, at its option, unless other-  
wise provided by law: (a) correct the defect by product repair without  
charge for parts and labor; (b) replace the product with one of the  
same or similar design; or (c) refund the purchase price. All replaced  
parts and products, and products on which a refund is made, become  
the property of RadioShack. New or reconditioned parts and products  
may be used in the performance of warranty service. Repaired or re-  
placed parts and products are warranted for the remainder of the  
original warranty period. You will be charged for repair or replace-  
ment of the product made after the expiration of the warranty period.  
This warranty does not cover: (a) damage or failure caused by or at-  
tributable to acts of God, abuse, accident, misuse, improper or abnor-  
mal usage, failure to follow instructions, improper installation or  
maintenance, alteration, lightning or other incidence of excess volt-  
age or current; (b) any repairs other than those provided by a Ra-  
dioShack Authorized Service Facility; (c) consumables such as fuses  
or batteries; (d) cosmetic damage; (e) transportation, shipping or in-  
surance costs; or (f) costs of product removal, installation, set-up ser-  
vice adjustment or reinstallation.  
This warranty gives you specific legal rights, and you may also have  
other rights which vary from state to state.  
RadioShack Customer Relations, Dept. W, 100 Throckmorton St.,  
Suite 600, Fort Worth, TX 76102  
We Service What We Sell  
3/97  
RadioShack  
A Division of Tandy Corporation  
Fort Worth, Texas 76102  
UBZZ01274ZZ  
Printed in the Philippines  
3A8  
 

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