Icom AH-4 Instructions - page 4
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