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Icom automatic antenna tuner, Manufacturer’s Part Number AT, matches the SSB transceiver to a long wire or whip antenna with little insertion loss. for the AT/ATE/AT HF AUTOMATIC ANTENNA are registered trademarks of Icom Incorporated (Japan) in the United States, the United Kingdom. Find great deals for Icom AT Shop with confidence on eBay!.

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It only takes a couple of watts of RF to figure out what to do. The versatile AT can be used with a variety of vessels, even smaller boats that cannot use a long antenna element.

ICOM AT – Techno Marine – Marine Safety & Electronics

If all antenna and ground requirements are met, the tuner will find a match pretty fast. After some dramas rigging up an antenna mainly a height issuethe unit appears to work well. It seems to be a bit more rugged than my AH-4, which I toasted by trying to tune a 75 meter mobile whip on 40 meters.

It is a capable tuner if you observe the following measures: The AT manual is very skimpy.

Icom AT Product Reviews

New to Ham Radio? The main benefit of the ‘ is cost. The pain that I experienced was the “start” input. Unacceptable in a marine HF system.


Just connect the control cable and antenna wire and go! At home I was feeding my balanced antenna with open-wire feeders directly from the AT with no choke on the coax and control line. Usually closer to 2. For a new frequency, it takes between 2 lcom 10 seconds. The AT is housed in a durable, completely weather-resistant acrylic case with rubber gaskets.

No manual tuning is needed. If you want the technical details, send me a email.

My only beef is the unit’s inability to tune a balanced antenna. Contact the site with comments or questions.

AT-130 Downloads

This unit works great with the following Icom radios, IC-mkii, mkiig and pro3. AT installation is simple. No adjustments are necessary. If you have any questions, problems, or suggestions about Reviews, please email your Reviews Manager. I have successfully interfaced it to my Kenwood TSS, making only minor, easily reversible modifications.

Retuning for a memorized frequency takes about 1. Email Subscription You are not subscribed to this review. Automatic tuning No manual tuning is needed. Normally 8 Volts, when less than 1 volt is recieved a tune cycle will commence”.

Reviews Summary for Icom AT My system consists of a 75′ random wire, 3 – 6 ‘ copper ground rods, connected to the tuner with copper strap, and 5 ground radials of various lengths more to come. For example, the AT will match a 7 m 23 feet long wire antenna across the marine band in the 1. Use a antenna of at least 35 feet. Low power tune-up The AT emits very little output power just mW during the tuning process. What it really means is “ground this input if you want it to start tuning”.


It has accompanied me to at least two different ships to be used with end-fed wire antennas. The manual says words to the effect of “Voltage input to trigger the start of the tuning cycle. I repair marine electronic equipment for a living, so I have the advantage of being very familiar with this unit. By design, it wants to end feed a random wire.

Icom AT130

There is also a connection to my Grumman aluminum canoe – just for good measure! I’m having a devil of a time getting this tuner to talk with a Barrett marine HF radio. This reduces the possibility of causing interference to other stations using the frequency. It works great that way. It appears it needs to also “be told” with a switch. Use a choke balun to reduce shield radiation. As its a commercial unit and unlikely to be connected to a non-icom HF set, I can see why this has gone undetected.

In addition, the AT has 8 convenient memories to store tuning information.