Icom AH-4 Instructions

Fig. 2 CABLE CONNECTIONS (ex. IC-706MKII)
Coaxial cable
IC-706MKII rear panel
Control cable
Bottom cover
GND
Top cover
PL-259
connector
Antenna element
AH-2b (optional)
J8
J2
black (GND)
red (DC13V)
white (START)
green (KEY)
GND
✍ NOTE: After inserting the coaxial cable into the AH-
4 top cover, solder the PL-259 connector to the
coaxial cable.
➀ Remove the top cover (Fig. 1).
➁ Install the control cable and coaxial cable (Fig. 1).
➂ Connect and solder the PL-259 connector to the
coaxial cable (Fig. 4).
➃ Connect the control cable to the AH-4 (Fig. 2).
➄ Connect the GND cable to the AH-4 (Fig. 3).
➅ Replace the top cover.
➆ Mount the AH-4 in the desired location; on an an-
tenna pole, in your vehicle’s trunk, etc. (Fig. 5).
➇ Connect an antenna to the AH-4 (Fig. 6).
➈ Connect the control cable and the coaxial cable to
the transceiver.
INSTALLATION
Fig. 1 COVER REMOVAL AND CABLE
INSTALLATION
➀ Remove 8 screws from the top cover and remove
the cover.
➁ Loosen the screws on both cable clamps. If de-
sired, install a strain relief insert (supplied) corre-
sponding to the diameter of the cable.
➂ Install the coaxial cable through the top cover
cable clamp.
➃ Install the control cable through the bottom cover
cable clamp.
➄ After connecting the coaxial cable and control ca-
bles, tighten the cable clamp screws.
Strain relief
insert
Coaxial
cable
Control
cable
Cable
clamp
✍ NOTE: For the IC-756
and IC-746, connect
to ANT 1.
Fig. 3 GROUND CONNECTIONS
Copper pipe Metal object Copper screen
;;;;;;
;;;;;;
;;;;;;
;;;;;;
yyyyyy
yyyyyy
yyyyyy
yyyyyy
To AH-4 GND terminal
The transceiver and antenna tuner must have an ade-
quate ground connection. Otherwise, the overall ef-
fency of the transceiver and antenna tuner installation
will be reduced. Interference, RF feed back and elec-
trical shocks from other equipment could also occur.
For best results, use the heaviest gauge wire or strap
available and make the connection as short as possi-
ble. (see right)
• A long wire connected to the GND terminal as a counter-
poise is also acceptable.
• Ground example

Icom AH-4 Specifications

Frequency and Impedance

frequency range with antenna longer than 7 m	3.5–54 MHz
frequency range with AH-2b	7–54 MHz
input impedance	50 Ω

Power

maximum input power	120 W
tuning power required	10 W (5–15 W)
rated voltage	13.8 V DC ±15% (current drain less than 1 A)

Operating Environment

usable temperature range	–10°C to +60°C (+14°F to +140°F)
VSWR	2.0 : 1 or less
dimensions	172(W) × 69.5(H) × 230(D) mm; 6[25]⁄32(W) × 6[3]⁄4(H) × 9[1]⁄16(D) in

Weight and Dimensions

weight	1.2 kg (2.65 lb)
dimensions	172(W) × 69.5(H) × 230(D) mm; 6[25]⁄32(W) × 6[3]⁄4(H) × 9[1]⁄16(D) in