[BC] In search of Harris SX1

[Cowboy]

On Monday 09 March 2009 09:55 am, cldube wrote:
>  My experience with the SX series is not if you'll need to replace 
>  transistors, but when.
>  I made replacements- about 2 per year and usually after severe weather on 
>  these transmitters, even when new
>  and very well matched to the antenna system. The transistors should be 
>  replaced in matched pairs for best results.
>  And these parts are no longer available from Harris nor anyone else that I 
>  know of. 

 Not my experience. If they fail, something is wrong, such as they were
 at one time replaced with an unmatched pair.
 The FET's can still be had, though I forget where. It's been six months
 or so since I rebuilt one.

 NEVER replace those rectifier fuses with anything rated higher current,
 or slower, such as a 3AG. Those fuses are not to protect the FET's, but
 to protect the board if a FET fails, though the fuses will fail on their own
 over time. If you lose more than one fuse only, ( no blown FET ) it's a
 good idea to replace them all. You will anyway.

-- 
Cowboy