Icom AH-4
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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
- Icom AH-4 Antenna Tuner ................................1(QTY)
- U-bolts ..................................................................2(QTY)
- U-bolt plates ........................................................2(QTY)
- Flat washers (M6 large) ....................................8(QTY)
- Flat washers (M6 small) ....................................4(QTY)
- Spring washers (M6) .........................................8(QTY)
- Nuts (M6) .............................................................8(QTY)
- Hex head bolts (M6 × 50) .................................4(QTY)
- Self-tapping screws (A0 6 × 30) ......................4(QTY)
- PL-259 connectors .............................................2(QTY)
- Weatherproof cap ...............................................1(QTY)
- Control cable (OPC-136; 5 m)...........................1(QTY)
- Coaxial cable (5D-2V × 5 m) ............................ 1(QTY)