Icom AH-4
HF+50 MHz Automatic Antenna Tuner
Compatible with most Icom HF radios, including but not limited to:
Icom 703, 703+, 706 MkIIG, 718, 746, 746Pro, 756, 756Pro, 756ProII, 756ProIII, 7000, 7100, 7200, 7300, 7410, 7600, 7800, 9100.
WIDE TUNING RANGE
The AH-4 provides reliable matching of frequencies from 3.5 MHz to 54 MHz when using at least a 7 m (23 ft) antenna; or 7 MHz to 54 MHz when using the AH-2b ANTENNA ELEMENT.
AUTOMATIC DIGITAL CONTROL TUNING
The built-in 8-bit microprocessor chooses the lowest SWR condition from more than 1,040,000 different LC (coil/capacitor) combinations.
45 FREQUENCY MEMORIES FOR FAST TUNING
The LC combinations of 45 previously-used frequencies are automatically memorized in the AH-4. Once a frequency is memorized, the AH-4 tunes on that frequency in less than 1 sec. Note that the AH-4 does not memorize a frequency which is normally tuned within 2.5 sec. Memories are retained only when the power is on.
WEATHERPROOF DESIGN
The AH-4’s tightly sealed plastic case allows convenient mounting virtually anywhere. The AH-4 can be mounted outdoors under your antenna.
0.3 W RADIATED POWER
Radiated power during tuning is less than 0.3 W, minimizing interference to other stations.
NOTE: 50 MHz tuning is possible with the IC-729*, IC-706MKII, IC-746 and IC-756; the IC-706 and IC-736 can only be tuned 3.5–30 MHz.
* Connect a 50 MHz antenna connector for 50 MHz operation.
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) inches
