SB220 Harbach mod. Trouble with mod

[Ray Friess]

sounds like maybe the keying transistor in the exciter may be shorted.


John Adkins wrote:

> I have a Heath SB-220 which I have used for several
> years with a Kenwood TS940s.  I bought a new xcvr, and
> I decided to install the Harbach "soft-key
> modification.  It seemed to work well the first time I
> used it, but after that, anytime the antenna relay
> cable is plugged into the xcvr, the relay is
> energized, and the linear draws plate current.  I have
> checked the cable, and it is wired correctly.  If it
> is attached but not hooked to the TS940s, the linear
> is in standby mode, but when it is plugged into the
> xcvr, on it goes.
>
> Any suggestions?
>
> Thanks,
>
> John
> w4kv
>
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