[ICOM] AT-500 Problems

[Gary Fiber]

Julio,

I would tell him to connect up his dummy load and adjust the presets to a 
flat swr. That gets the tuner to a "known" 50 ohm condition. Then reconnect 
his antenna and readjust the presets on all bands for the low swr point. 
Maybe set the preset on 15 meters in place of 17 meters. Finally see how it 
tunes on 15 meters then. He might want to remove the top cover and make 
sure he always retains the capacitors in at least 1/2 mesh. On the AT-500 
it was possible on the higher bands to have 2 preset low positions and one 
would be with the capacitor almost fully open which was incorrect.

A very common " modification " to the AT-500 was to move all the internal 
connections to a single coax connector.

Gary K8IZ


>I have a friend who purchased an IC-2KL and AT-500 combo.
>He is having problems with the tuner on 15M. It just will not tune and
>shows infinite SWR. He reports that it will tune on 17M so that he can
>load his Force 12 C4 antenna on that band. I asked him to check the taps
>on the rear panel (even knowing that 15 & 17 Meters are the same to the
>AT-500) and he reports they are all routed to the #1 connector. Since
>the tuner uses the same coax connector and coax line to the antenna we
>are at a loss to explain why it won't tune on 15M. The good news is the
>antenna is resonate in the phone portion of the 15M band but the tuner
>doesn't like it anywhere in the band.
>Does anyone have any thoughts on this?
>Julio, W4HY

Gary Fiber K8IZ
GROL PG-19-6691
Washington State Resident