Icom Stereo System AT 141 User Manual

INSTRUCTION MANUAL  
HF AUTOMATIC  
ANTENNA TUNER  
AT-141  
 
MISCELLANEOUS ITEMS  
TABLE OF CONTENTS  
The following parts are additionally required for instal-  
lation, but are not supplied with the AT-141.  
Purchase these parts locally.  
FOREWORD …………………………………………… i  
IMPORTANT …………………………………………… i  
EXPLICIT DEFINITIONS…………………………… i  
PRECAUTIONS ……………………………………… i  
SUPPLIED ACCESSORIES ………………………… i  
MISCELLANEOUS ITEMS ………………………… ii  
FEATURES …………………………………………… ii  
TABLE OF CONTENTS ……………………………… ii  
q AWG 14×4-conductor shielded cable  
*Icom offers an optional OPC-1465 CONTROL CABLE.  
Length: 10 m; 32.8 feet  
w 50 coaxial cable  
e PL-259 connectors  
FEATURES  
1 ANTENNA SYSTEM …………………………… 1–2  
I Antenna for ship ………………………………… 1  
I Coaxial cable …………………………………… 2  
I Ground and counterpoise ……………………… 2  
Matches all bands  
The AT-141 matches any frequency on every HF ma-  
rine band. For example, the tuner matches a 7 m; 23 ft  
long-wire antenna across 1.630 MHz.  
2 INSTALLATIONS ………………………………… 3–5  
I Installation outline ……………………………… 3  
I Control cable……………………………………… 3  
I PL-259 connector………………………………… 4  
I Mounting ………………………………………… 4  
I Cable connections ……………………………… 5  
Full automatic tuning  
Just push the [TUNE] key on the transceiver, and the  
AT-141 adjusts immediately to the minimum SWR of  
any frequency on any HF marine band.  
HF operation on any size ship  
The AT-141 allows you HF operation where antenna  
element length is restricted due to space.  
3 CONTROL CABLE SIGNALS …………………… 6  
I Terminal information …………………………… 6  
4 UNIT DESCRIPTION AND SPECIFICATIONS … 7  
I Unit description…………………………………… 7  
I Specications …………………………………… 7  
Weather resistant  
The AT-141 is housed in a durable, completely weather  
resistant ASA case with a rubber gasket. The antenna  
tuner can be conveniently installed both on the deck or  
in the cabin near the antenna element.  
Simple installation  
Installation is simple. Just connect the control and an-  
tenna cables. You never need to open the cover.  
45 memories for shorter tuning time  
To decrease the tune-up time, the AT-141 automatically  
stores the matching conditions for up to 45 frequencies.  
Re-tuning for a memorized frequency takes approx. 1  
sec.  
Super capacitor for memory backup  
Even if the AT-141 is not used for approx. 1 week, the  
built-in super capacitor backs up contents of the 45  
memories.  
Low power tune up  
The AT-141 emits low output power during tuning. This  
feature reduces the possibility of causing interference  
to other stations.  
Tuner through function  
The tuner through function is built into the AT-141. This  
function helps improve receiver gain, depending on the  
antenna element length used, and operating fre-  
quency.  
ii  
 
1
ANTENNA SYSTEM  
I Antenna for ship  
Required antenna element length  
Required antenna element length to achieve full per-  
formance varies according to the lowest frequency:  
Insulator  
The lowest frequency Required antenna element length  
Backstay operates as  
a long-wire antenna.  
1.6 MHz band  
4 MHz band  
7 m; 23.0 feet or longer  
3 m; 9.8 feet or longer  
The longer the antenna element, the better the an-  
tenna efciency.  
Undesirable antenna element lengths  
AVOID multiples of 2λ (half wavelength) for an-  
tenna element lengths, since tuning becomes difcult.  
Insulator  
1
L : Antenna element length to be avoided [m]  
f : Operating frequency [MHz]  
n : Natural number (n = 1, 2, 3, ...)  
300  
f
1
2
L =  
n
×
×
Whip antenna  
[Example]  
At an operating frequency of 16 MHz, avoid the fol-  
lowing antenna element lengths:  
300  
16  
1
2
n
9.4, 18.8, ...  
×
×
L =  
1 m  
39 inches  
For example, if 15 m is selected for an antenna ele-  
ment length, you have no problem in the 1.625 MHz  
marine bands range.  
NOTE: Keep antennas as far away from other objects  
as possible, especially metal objects.  
1
 
ANTENNA SYSTEM  
1
I Coaxial cable  
Insulate the lead-in cable of the AT-141 antenna ter-  
minal and antenna element from other metal objects.  
To prevent erroneous indications, keep cables as far  
away as possible from the ux gate compass.  
To prevent interference, keep cables as far as possi-  
ble from an antenna, electric pump and other elec-  
tronic equipment.  
Use suitable noise filters for alternators, fluorescent  
lights, etc. Ask your Dealer for details.  
I Ground and counterpoise  
Why a ship’s ground is required  
The AT-141s ground terminal MUST be connected  
to your ships ground. Grounding prevents electric  
shocks, interference to other equipment and other  
problems. Grounding also ensures effective signal  
transmission.  
Counterpoise  
If your ship is made of FRP, etc. and a good ships  
ground is not available, connect a counterpoise.  
14λ radial for  
each band  
Ground terminal  
DANGER! NEVER connect the ground terminal to  
the following points. These connections may cause  
an explosion or electric shocks:  
Gas or electrical pipe  
Fuel tank or oil-catch pan  
AT-141  
IMPORTANT! The mounting plate is NOT con-  
nected to the AT-141s internal ground.  
14λ (quarter wavelength) radial for each band is suit-  
able for a counterpoise. Install the counterpoise di-  
rectly below the AT-141s ground terminal. Insulate  
the ends of each radial from other metal objects. Lay-  
out the radial horizontally and as straight as possible.  
Ideal ground points  
One of following points is ideal:  
External ground plate  
External copper screen  
External copper foil  
L : Counterpoise length for the operating frequency [m]  
f : Operating frequency [MHz]  
Good ground points  
If electrically connected to sea water, one of the fol-  
lowing points is usable:  
Stainless steel stanchion  
Through mast  
300  
f
1
4
L =  
×
[Example]  
At an operating frequency of 16 MHz, use a counter-  
poise with the following length:  
Through hull  
Metal water tank  
300  
16  
1
4
L =  
1 m  
4.7 [m]  
×
Undesirable ground points  
AVOID the following points, if possible. These con-  
nections may cause noise or electrolysis:  
Engine block  
39 inches  
Ground cable  
For best results, use the heaviest gauge wire or metal  
strap available. Make the distance between the AT-  
141s ground terminal and ships ground as short as  
possible.  
Ships DC battery ground  
Electrolysis  
All ground cables from the AT-141, HF transceiver,  
etc. on your ship should be connected to only 1 ships  
ground.  
Supplied ground cable can be used for ground con-  
nection to a through mast. Confirm that the through  
mast is electrically connected to sea water.  
AVOID connection to 2 or more points. Voltage dif-  
ference between 2 or more ships grounds may cause  
electrolysis.  
RWARNING!When grounding to metal hull  
Use a Zinc anode to protect the hull from electroly-  
sis.  
AVOID connection between dissimilar metals where  
an electric current is present. These connections may  
cause electrolysis.  
Ask your technical dealer, installer or refer to a tech-  
nical book, etc., for RF ground details.  
2
 
2
INSTALLATIONS  
I Installation outline  
q Connect a control cable and 4-conductor shielded  
r Connect the control and the coaxial cables be-  
tween the transceiver and the AT-141.  
Refer to p. 5 Cable connections.”  
cable.  
Refer to Control cablebelow.  
t Connect an antenna, ships ground or counter-  
w Connect and solder the PL-259 connector to the  
coaxial cable.  
poise.  
Refer to p. 1 Antenna for shipand p. 2 Ground and  
counterpoise.”  
Refer to p. 4 PL-259 connector.”  
e Mount the AT-141 in the desired location.  
Refer to p. 4 Mounting.”  
I Control cable  
Between the AT-141 and HF marine transceiver, con-  
nect 4 control signal lines as shown below. To prevent  
RF feedback, use a 4-conductor shielded cable. Con-  
nect the shield line to the [GND] terminal on the trans-  
ceiver. Icom offers 10 m (32.8 ft) long optional control  
cables as at right.  
OPC-1465 : for IC-M801E  
Refer to p. 6 Terminal informationfor details.  
D When connecting to Icom IC-M801E  
Use the optional OPC-1465, or assemble the desired length 4-con-  
ductor shielded cable and the connector kits supplied with the trans-  
ceiver and the tuner.  
To transceiver  
To AT-141  
[ANTC] : Black  
[13.6] : Red  
[STAR] : White  
[KEY] : Green  
[GND]  
[ANTC] : Black  
[13.6] : Red  
[STAR] : White  
[KEY] : Green  
[GND]  
3
 
INSTALLATIONS  
2
I PL-259 connector  
q Slide the coupling ring over the coaxial cable. Strip  
the cable jacket and pull back to reveal 10 mm of  
braid.  
e Slide the connector body over the cable and sol-  
der as shown below.  
Solder  
Solder  
Soft solder the exposed braid and then pull out the jacket.  
Coupling  
30 mm  
r Screw the coupling ring onto the connector body.  
10 mm (soft solder)  
w Strip the cable as shown below. Soft solder the cen-  
ter conductor the entire length of the exposed braid.  
12 mm  
10 mm  
38 inches  
soft solder  
10 mm  
I Mounting  
Attach the AT-141 either horizontally or vertically with  
one of the water drains facing downwards. After  
mounting, remove the screw in the water drain.  
Mounting on a at surface  
Using nuts and bolts  
Using self-tapping  
screws  
Mounting on a Mast/Metal pole  
Mast/  
Metal pole  
Using U-bolts  
U-bolt  
U-bolt plate  
Flat washer(L)  
Spring washer  
Flat washer(S)  
Nut  
Nut  
Flat  
washer(S)  
Spring  
washer  
Flat  
washer(L)  
WARNING: Mount the AT-141 securely with the  
supplied nuts and bolts. Otherwise, vibrations and  
shocks due to waves, etc. could loosen the antenna  
tuner making if fall, causing personal injury.  
Flat  
Weatherproof cap  
Drill a hole here  
Diameter:78 mm; 3216 inches  
washer(L)  
Hex head  
bolt  
9
5
4
 
2
INSTALLATIONS  
I Cable connections  
q Connect the coaxial cable and the control cable to  
the AT-141 as illustrated below.  
r Connect the coaxial cable and the control cable to  
the transceiver as illustrated below.  
w Cover both the antenna and the control cable con-  
nectors with rubber vulcanizing tape and x it with  
a vinyl tape to prevent water seeping into the con-  
nector.  
t Ground the transceiver, AT-141 and shield cable of  
the control cable via the ground terminal.  
See p. 2 for grounding details.  
IMPORTANT!AT-141  
NEVER ground the AT141 via the mounting  
plate. It is not connected to ground internally.  
Rubber vulcanizing tape  
Ground terminal  
Mounting plate  
e Fix both of the coaxial and control cables to pro-  
tect the inside connections.  
DO NOT pull the antenna and control cable re-  
ceptacles. This may cause disconnection (in the  
AT-141), internal connector damaged or bad  
connection.  
Icoms HF transceiver  
AT-141  
Grounding  
Grounding  
5
 
3
CONTROL CABLE SIGNALS  
I Terminal information  
Consider the following points when using a non-Icom  
transceiver.  
Start voltage [STAR]  
When a start voltage (less than 1 V) is received, the  
AT-141 begins automatic tuning.  
Terminal  
Description  
More than  
350 msec.*  
[KEY]  
Key voltage. Grounded during tuning.  
Max. current drain 100 mA.  
Start  
voltage 8  
Approx. 7.5 V  
[13.6]  
13.6 V DC + input terminal.  
Max. current drain 2 A  
[V]  
6
4
[STAR] Receives start voltage.  
Max. current drain 1 mA  
Less than 1 V to  
2
start tuning  
0
[ANTC] Antenna current detector output.  
Time  
*For tuner through operation; Less than 250 msec.  
Key voltage [KEY]  
During automatic tuning, the AT-141 grounds the key  
voltage line, and the HF transceiver reduces output  
power.  
During automatic tuning  
Key  
Approx. 7.5 V  
voltage 8  
[V]  
6
[KEY]  
[STAR]  
[13.6]  
4
2
0
[ANTC]  
Time  
Grounded  
6
 
4
UNIT DESCRIPTION AND SPECIFICATIONS  
I Unit description  
340 mm  
80 mm  
Ground terminal  
Mounting plate  
Water drain screw  
Antenna cable receptacle  
Control cable receptacle  
Antenna terminal  
Mounting plate  
91.5 mm  
I Specications  
Frequency coverage  
Power supply requirement  
Current drain  
: 1.630 MHz (with 7 m or longer antenna element)  
: 13.6 V DC (supplied from HF transceiver)  
: Max. 2 A  
Operating temperature range : 30°C to +60°C  
Weight (approx.)  
: 2.5 kg  
Antenna connector  
Max. Input power  
Automatic tuning time  
: SO-239 (50 )  
: 150 W (PEP)  
100 W (continuous)  
: Approx. 23 sec. (general condition) Max. 15 sec.  
Approx. 1 sec. (re-tuning for a memorized frequency)  
: SWR 2.0:1 (after tuning, except for multiples of 12 λ)  
Automatic tuning accuracy  
All stated specications are subject to change without notice or obligation.  
7
 
Icom America Inc.  
<Corporate Headquarters>  
Icom (Europe) GmbH  
Communication Equipment  
2380 116th Avenue N.E., Bellevue, WA 98004, U.S.A.  
Phone: +1 (425) 454-8155 Fax: +1 (425) 454-1509  
<Customer service>  
Himmelgeister Str. 100,  
D-40255 Düsseldorf, Germany  
Phone: +49 0211 346047 Fax: +49 0211 333639  
Phone: (425) 454-7619  
Icom Canada  
Icom Spain S.L.  
Glenwood Centre #150-6165 Highway 17, Delta,  
B.C., V4K 5B8, Canada  
Phone: +1 (604) 952-4266 Fax: +1 (604) 952-0090  
Ctra. Rubi, No. 88 Edicio Can Castanyer”  
08190, Sant Cugat del Valles, Barcelona, Spain  
Phone: +34 (93) 590 26 70 Fax: +34 (93) 589 04 46  
Icom (Australia) Pty. Ltd.  
Icom (UK) Ltd.  
A.B.N. 88 006 092 575  
Unit 1/103, Garden Road, Clayton, Victoria, 3168,  
Australia  
Unit 9, Sea St., Herne Bay, Kent, CT6 8LD, U.K.  
Phone: +44 01227 741741 Fax: +44 01227 741742  
Phone: +61 (03) 9549 7500 Fax: +61 (03) 9549 7505  
Icom New Zealand  
Icom France S.a  
146A Harris Road, East Tamaki, Auckland, New Zealand  
Phone: +64 09 274 4062 Fax: +64 09 274 4708  
Zac de la Plaine, 1, Rue Brindejonc des Moulinais  
BP 5804, 31505 Toulouse Cedex, France  
Phone: +33 (5) 61 36 03 03 Fax: +33 (5) 61 36 03 00  
Asia Icom Inc.  
Icom Polska  
6F No. 68, Sec. 1 Cheng-Teh Road, Taipei, Taiwan R.O.C.  
Phone: +886 (02) 2559 1899 Fax: +886 (02) 2559 1874  
Sopot, 3 Maja 54 Poland  
Phone: +48 (58) 550 7135 Fax: +48 (58) 551 0484  
Beijing Icom Ltd.  
Room C01, 10th Floor, Long Silver Mansion, No.88  
Yong Ding Road, Haidian District, Beijing, 100039,  
China  
Phone: +86 (010) 5889 4250Fax: +86 (010) 5889 4250  
A-6472H-1EU  
Printed in Japan  
© 2005 Icom Inc.  
1-1-32 Kamiminami, Hirano-ku, Osaka 547-0003, Japan  
 

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