[Heathkit] TS-850 & SB200

[jeremy-ca]

If you connected the 850 to the SB200 relay terminals you have probably 
fried the 850 switching transistor.
The 200 uses -125VDC to switch and newer rigs need an intermediate circuit 
to be compatible.

QST for 1/88 has a Hints & Kinks circuit which is easily duplicated and 
works well. It can be built using a pair of terminal strips or some perf 
board. Parts cost from Mouser is around $5.

 Some other circuits, using an IC, work but are very susceptible to any 
instability in the amp.

Carl
KM1H


----- Original Message ----- 
From: "Paul Gondos" <pgondos at hotmail.com>
To: <Heathkit at mailman.qth.net>
Sent: Sunday, August 20, 2006 7:18 PM
Subject: [Heathkit] TS-850 & SB200


> Hi:
> I have the rig hooked up to the amp with the SWR at 1:1 and 100 watts 
> out.I put the METER SWITCH in the PLATE position and put the AMP on. With 
> NO driver output from the rig I get no idling plate current at all, when 
> it should be at 90 ma. I need help !! Thanks.
>
> Paul, KA3JOI
> pgondos at hotmail.com
>
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