Monitor the offset voltage to the PTO to see if it
changes.
73, Dave,VE1ADH
--- wb5jnc@juno.com wrote: > Greetings all,
>
> I have been hearing a random frequency shift on
> transmit from my dad's Delta 580 during our contacts
> on 40M CW. The pitch of the received signal will
> shift down several hundred hertz (estimated) for a
> few characters every so often and then go back up.
> It has to be from his transmitter because the
> background QRM doesn't change pitch and another op
> in our roundtable has noticed the same thing I'm
> hearing. My first thought was the PTO needing a
> "lube job" but it seems too consistent for that --
> it never shifts during a character, apparently only
> between, and the amount of the shift stays
> consistent. I'm now more inclined to think something
> in the TX switching is the culprit, like it is
> sometimes picking up the sideband offset instead of
> the one for CW. Anyone else out there ever
> encountered this? (Also I don't think he has an
> external VFO for it, so I can't blame it on that.)
>
> TNX/73, Al
>
>
>
>
>
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