Icom AH-4 Instructions

The AH-4 complies with essential requirements of the
89/336/EEC directive for Electromagnetic Compatibility.
This compliance is based on conformity with the ETSI
specification ETS300 684 (EMC product standard for
Commercially Available Amateur Radio Equipment).
• Frequency range : 3.5–54 MHz (with an antenna longer than 7 m; 23 ft)
7–54 MHz (with the AH-2b)
• Maximum input power : 120 W
• Input impedance : 50 Ω
• Tuning power required : 10 W (5–15 W)
• Rated voltage : 13.8 V DC ±15% (current drain less than 1 A)
• Usable temperature range : –10°C to +60°C (+14°F to +140°F)
• VSWR : 2.0 : 1 or less
(except antennas a half wave or multiple of a half wave in length)
• 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
All specifications are subject to change without notice or obligation.
6-9-16 Kamihigashi, Hirano-ku, Osaka 547-0002 Japan
Count on us!
A-8295G-1EX Printed in Japan
Copyright 1997 by Icom Inc.
To ensure the correct impedance match, tune the an-
tenna with the AH-4 each time the operating frequency
is changed.
➀ Set the desired amateur band and frequency of the
transceiver.
➁ Push and hold [TUNER] for 2 sec.
• The [TUNER] light flashes and “CW” appears while tun-
ing.
➂ The [TUNER] light lights constantly when tuning is
complete.
• When the connected wire cannot be tuned, the [TUNER]
light goes out, the AH-4 is bypassed and the antenna
wire is connected to the antenna connector on the trans-
ceiver directly.
➃ To bypass the AH-4 manually, push [TUNER].
OPERATION
SPECIFICATIONS
CALCULATION OF UNDESIRABLE ANTENNA
LENGTHS
Length of 300
×
1
(1/2 λ) =
half wave operating frequency (MHz) 2
[EXAMPLE] Antenna lengths to avoid when operat-
ing at 29.00 MHz
Multiple 300
×
1
× (1, 2, 3…) = 5.2, 10.3, 15.5 m=
of 1/2 λ 29 2
USB
CW
Push [TUNER] for 2 sec.
• OPC-420 SHIELDED CONTROL CABLE
(cable length 10 m)
Shielded control cable helps protect the transceiver from RF feedback and extends separation between tuner and
transceiver up to 10 m.
• AH-2b
ANTENNA ELEMENT
A 2.5 m long antenna element for mobile operation with AH-4. Frequency coverage: 7–54 MHz with the AH-4.
OPTIONS

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