[ICOM] 756 Pro blown Ant 1 input

Phil Krichbaum vailphil at sopris.net
Mon Jun 28 13:15:51 EDT 2010


    With the typical  756PROIII ESD failure you can still RX fine on 
either antenna port, just some 300 Volt diodes and some FETs in the 
tuner fail and you have no TX power. Usually finals and drivers are 
still OK. It sounds like you blew something in the antenna switch 
circuit that hopefully is easier and less $$$ to repair. I took mine to 
FD but used some of the ICE 8KW ESD filters and we did have some T 
storms! They are not really good for 8KW but discharge all ESD without 
needing a voltage buildup  to jump a gap like with Polyphaser etc.
    Phil N0KE

WW3S wrote:
> I know I shouldn't have taken this rig to FD.....somehow, the input to Ant 1 
> is gone...seems open, no RX, no TX....rig works fine on Ant 2.....is there 
> some sort of diode or fuse that may have gone open?
>
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