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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New to Ham Radio? It has accompanied me to at least two different ships to be used with end-fed wire antennas. 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.
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. It works great that way. One drawback to using the AT with the is that every time I would change bands or frequency ranges the tuner would automatically tune.
Just lately it stopped doing that.
No problem in tuning a long wire. I’m limited as to at1130 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 jcom 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: Give it a better than average ground.
Use a choke balun to reduce shield radiation. Use a antenna of at least 35 feet. My system consists of a 75′ random wire, 3 – 6 ‘ copper ground rods, connected to at30 tuner with copper strap, and 5 ground radials of various lengths more to come.
There is also a connection to my Grumman aluminum canoe – just for good measure!
Icom AT Antenna Tuner
Getting it to play with non – Icom radios is possible, but probably not in a fully automatic sense. You have to manually start the tuning process for any new frequency. I have successfully interfaced it to my Iicom TSS, making only minor, easily reversible modifications. Now when I press the “voice” button that is normally used for the voice synthesizer option – not installed the tuner begins it process.
Icom AT Product Reviews
If you want the technical details, send me a email. 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 – Wt130 full TX power! If all antenna and ground requirements are met, the tuner will find a match pretty fast. My only beef is the unit’s icok to tune a balanced antenna.
By design, it wants to end feed a random wire. Sadly, it is not compatible with a balun Should be a interesting experiment. The AT manual is very skimpy. Getting the AT to autotune when it sees a new carrier seems impossible. It appears it ocom to also “be told” with a switch. Unacceptable in a at13 HF system. I purchased the unit while I was on holiday so I’d be forced to read through the manual for a few days before trying to hook it up.
I’ve ended up with a little black box that attaches to the top of the radio and has a ‘tune’ button. This causes the SG to emit a carrier and triggers the AT to start a tune cycle, sending the CW signal for as long as the tune cycle requires.
My main gripe is the manual. It seems to gloss ico, the requirements if it is not connected to an Icom HF set. The pain that I experienced ucom the “start” input. The manual says words to the effect of “Voltage input to trigger the start of the tuning cycle. Normally 8 Volts, when less than 1 volt is recieved a tune cycle will commence”.
What it really means is “ground this input if you want it to start tuning”. As its a commercial unit and unlikely to be connected to a non-icom HF set, I can see why iclm has gone undetected. Still, a bit of a let down. After some dramas rigging up an antenna mainly a height issuethe unit appears to work well. When tuning the same frequency twice, it is all over in less than a second. For a new frequency, it takes between 2 and 10 seconds.
Usually closer to 2. It only takes a couple of watts of RF to figure out what to do. I normally turn my down to watts which is plenty. The main benefit ay130 the ‘ is cost. Contact the site with comments or questions. Reviews Summary for Icom AT Email Subscription You are not subscribed to this review. My Subscriptions Subscriptions Help. This unit works great with the following Icom radios, IC-mkii, mkiig and pro3.
I repair marine electronic equipment for a living, so I have the advantage of being very familiar with this unit. I’m having a devil of a time getting this tuner to talk with a Barrett marine HF radio.
I recently got my brand new AT working. If you have any questions, problems, or suggestions about Reviews, a130 email your Reviews Manager.