[ARC5] Backwave

[Ian Wilson]

I have read accounts of switching in/out a small extra tuning capacitance
to move the oscillator a few kHz away from the TX frequency. Sounds workable
but I haven't tried it (yet).

73, ian K3IMW

On Sun, Oct 25, 2015 at 6:11 PM, Rich Post <kb8tad at gmail.com> wrote:

> Hi ARC-5ers,
> A friend and I have been experimenting with getting a BC-696A back on the
> air.  The transmitter had already been modified per standard QST design,
> with the oscillator running at all times, the cathodes keyed and, of
> course, the relays removed, so no break-in.  With good band conditions, we
> experienced  backwave.  What have you done to limit or solve backwave from
> an ARC-5 or SCR-274N transmitter on CW?
>
> Has anyone tried keying the oscillator with, say, a solid state switch such
> as a high-voltage NPN or FET along with a mechanical relay for the cathodes
> under the theory that the solid state switch would power the oscillator
> just slightly ahead of the PA?  (Assuming that the difference would be
> enough to avoid chirp)
>
> Let us know your voice of experience.
>
> Tnx de Rich KB8TAD
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