Icom AT-141 - Section 2 Inside Views

ii
MISCELLANEOUS ITEMS
The following parts are additionally required for instal-
lation, but are not supplied with the AT-141.
Purchase these parts locally.
q AWG 14 × 4 conductor shielded cable
 •IcomoffersanoptionalOPC-1465controlcable.
Length: 10 m
w 50 Ω coaxial cable
e Two PL-259 connectors
FEATURES
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 near the
antenna element.
Matches all bands
The AT-141 matches all frequencies on the HF marine
band. For example, the tuner matches a 7 m long-wire
antenna across 1.6–30 MHz.
Full automatic tuning
Just push the [TUNE] key on the transceiver, and the
AT-141 immediately tunes for a minimum SWR on any
frequency in the HF marine band.
HF operation on any size ship
The AT-141 allows HF operation where antenna ele-
ment length is restricted due to space.
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 automati-
cally stores the matching conditions for up to 45 fre-
quencies. Retuning a memorized frequency takes ap-
proximately 1 second.
Super capacitor for memory backup
Even if the AT-141 is not used for approximately 1
week, the built-in super capacitor backs up the con-
tents 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 the operat-
ing frequency.
FOREWORD ………………………………………… ii
IMPORTANT …………………………………………… ii
EXPLICIT DEFINITIONS …………………………… ii
PRECAUTIONS ……………………………………… ii
SUPPLIED ACCESSORIES ………………………… ii
MISCELLANEOUS ITEMS………………………… iii
FEATURES ………………………………………… iii
TABLE OF CONTENTS …………………………… iii
1 SYSTEM INSTALLATION ………………………… 1
Five Critical Points for a successful HF ■
installation ���������������� 1
Vessel ground connection ■ �������� 1
Antenna and tuners ■ ������������ 2
The importance of grounding ■ ������� 2
2 ANTENNA SYSTEM ……………………………… 3
Antenna for ship ■ ������������� 3
Coaxial cable ■ �������������� 4
Ground and counterpoise ■ ��������� 4
3 INSTALLATIONS ………………………………… 5
Installation outline ■ ������������ 5
Control cable ■ �������������� 5
PL-259 connector ■ ������������ 5
Waterproofing the antenna connection ■ ��� 6
Mounting ■ ���������������� 6
Cable connections ■ ������������ 7
4 CONTROL CABLE SIGNALS …………………… 8
Terminal information ■ ����������� 8
Unit description ■ ������������� 9
Specifications ■ �������������� 9
5 UNIT DESCRIPTION AND SPECIFICATIONS … 9
6 INSTALLATION EXAMPLE …………………… 10
TABLE OF CONTENTS