[Amps] SB200 problem

Tom Osborne w7why at verizon.net
Fri Feb 23 23:08:39 EST 2007


Tom W8JI wrote:

> That's because the relay inthe SB200 is not compensated for
> SWR on the higher bands. Normally connecting a 27pF
> 500-1000V capacitor from the shorting jumper on the NC
> contacts to ground will fix that.

Hi Tom

I am having the same sort of problem here, except it is on 80 meters only 
that I am having the problem.  My SB 200 is fine to my TS-450SAT on the 
40-10 meters, but on 80 meters, it has a super high SWR on the input.  I 
took it out of the case last night and looked at the coil/capacitor combo, 
and it all looks good.  I re-soldered all the connections going to the 80 
meter contacts on the switch and coil, but SWR is still too high. Even tried 
adjusting the slug in the coil.   I did use the tuner and could get it to 
load.  Would that cap work for 80 meters also, or just the higher bands. 
With the straight through operation of the amp to the antenna, the SWR is 
fine.  73
Tom W7WHY



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