• IC AH-4 Automatic Antenna Tuner
• IC AT-140 Automatic Antenna Tuner
• IC-AT-141 Automatic Antenna Tuner

The ICOM AH-4 automatic antenna tuner is designed to work with select ICOM transceivers including the Icom 703, 706 series, 746 series, 756 series and others.

It provides reliable matching of frequencies from 3.5 to 54 MHz when using a wire of at least 23 feet (7 m) in length. It can also be used for matching 7 to 54 MHz when used with a 9 foot stainless steeel whip in a mobile situation. The built-in 8-bit microprocessor chooses the lower SWR condition from more than 1,040,000 different LC (coil/capacitance) combinations. The LC combinations of 45 previously-used frequencies are automatically memorized by the AH-4. Once a frequency is memorized, the AH-4 tunes on that frequency is less than one second. (Memories are retained only when the power is on).

The AH-4 is sealed in a plastic weatherproof case for convenient mounting outdoors under your antenna. The transceiver and the AH-4 tuner must have a proper ground connection. Use a short heavy gauge wire or strap for this. This tuner may be attached to a pole using the two supplied U Bolts, or to a flat surface (screws and bolts are supplied).

The AH-4 comes with a 16 foot (5 m) control cable that connects to the rear panel of compatible ICOM transceiver. A 16 foot (5 m) raw coax cable and two PL-259s are supplied to connect the transceivers antenna output to the AH-4 antenna input. The PL-259s must be soldered on by the user.  

This tuner requires about 10 watts (5-15 Watts) to activate and can handle up to 120 watts. It operates on 13.8 VDC (less than 2 amps) drawn from the transceiver control cable.

Size: 7x2.9x9.2 inches 2.65 Lbs. (172x70x230mm 1.2 kg).

Cable set to connect AH-4 tuner to all recent ICOM HF radios.

The AT 140 matches any frequency on every HF marine band. For example, the tuner matches a 7 m; 23 ft long-wire antenna across 1.6-30 MHz. Full automatic tuning Just push the [TUNE] switch on the transceiver, and the AT 140 adjusts immediately to the minimum SWR of any frequency on any HF marine band.

HF operation on any size ship

The AT 140 allows you HF operation where antenna element length is restricted due to space.

Weather resistant The AT 140 is housed in a durable, completely weather resistant ASA case with a rubber gasket.

45 memories for shorter tuning time

To decrease the tune-up time, the AT-140 automatically stores the matching conditions for up to 45 frequencies. Re-tuning for a memorized frequency takes approx. 1 second. Super capacitor for memory backup Even if the AT-1 40 is not used for approx. 1 week, the built-in super capacitor backs up contents of the 45 memories.

Low power tune up

The AT-140 emits low output power during tuning. This feature reduces the possibility of causing interference to other stations.

Tuner through function

The tuner through function is built into the AT-140. This function helps improve receiver gain, depending on the antenna element length used, and operating frequency.

Icom OPC1465 Tuner Control Cable (links Icom AT140 tuner to applicable Icom radio)

Tuner cable is 10 metres long