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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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. Use a antenna of at least 35 feet. Sadly, it is not compatible with a balun It works great that way. My Subscriptions Subscriptions Help. The AT emits very little output power just mW during the tuning process. Usually closer to 2. Automatic tuning No manual tuning is needed.
Ar130 manual tuning is needed. The versatile AT can be used with a variety of vessels, even smaller boats that cannot use a long antenna element.
Just connect the control cable and antenna wire and go! The AT allows you to transmit with strong RF output power, and is perfect for maritime mobile operations. As its a commercial unit and unlikely to be connected to a non-icom HF set, I can see why this has gone undetected.
Getting the AT to autotune when it sees a new carrier seems impossible. What it really means is “ground this input if you want it to start tuning”.
Give it a better than average ground. Use a choke balun to reduce shield radiation.
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. The manual says words to the lcom of “Voltage input to trigger the start of the tuning cycle.
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It only takes a couple of watts of RF to figure out what to do. I’m having a devil of a time getting this tuner to talk with a Barrett marine HF radio. By design, it wants to end feed a random wire. I’m limited as to the amount of RF i can put through it but watts is OK for me and as i said i have a balanced antenna i just connect the open wire feeder directly to the atu, one leg of the feeder to the hot side and the other to the ground, and a common mode choke at the feed point between atu and transceiver.
It is a capable tuner if you observe the following measures: 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. This unit works great with the following Icom radios, IC-mkii, mkiig and pro3. The AT is housed in a durable, completely weather-resistant acrylic case with rubber gaskets.
In addition, the AT has 8 convenient memories to store tuning information. Improved tuning performance…the tune-up time is less than 3 seconds in any frequency on an HF marine band.
No problem in tuning a long wire. Ucom pain that I experienced was the “start” input. This line needs to be connected to your radio in a way that causes it to go into the transmit mode, and produce about 10 – 15 watts of rf – NOT full TX power! Low power tune-up The AT emits very little output power just mW during the tuning process.
One drawback to using the AT with the is that every time I would change bands or frequency ranges the tuner would automatically tune.