I have an Icom AH-4 auto tuner that I would like to place at the feedpoint of my horizontal loop so that when I tune, I will have 50 ohms coming through the long run of coax to my rig instead of high swr. I bought the tuner when I had my ICOM rigs that would interface and tune directly to it.
I looked on the internet, and there are several universal interfaces, some more complex than others. I elected to go with the simple interface that consists of a momentary switch, an led and 3K resistor in series as the the main components. The following link shows a photograph of the circuit. http://pacificcoastsail.com/PCSC_working/Blog/BOAT%20RESOURCE%20LIST%20VIP/m ods_dk%20-%20ICOM%20-%20AH-4_files/IC-AH3_and_AH4_wiring.gif I have my KX3 connected to my KXPA100 but the tuner is bypassed. I have read that it requires at least 10 watts output from the rig to make the circuit work. If I set the TUN PWR to 10 watts and press the TUNE (not ATU TUNE) the power output shows 10 watts but when I press the momentary switch to tune the AH-4, nothing happens and the tuner is not engaged and swr is unchanged at 5.2:1.. If I set TUN PWR to 20 watts and try it, the power output shows zero before I can press the momentary switch. . The LED is 12V Led. I have 12.8 volts into the circuit, and at the terminals of the DC power receptacle where the circuit attaches, I read 3.66V with everything connected. I would appreciate it if any others have gotten this circuit to work and could tell me what I am missing. Thanks, Terry ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
