Rick,
That was the only option I could come up with that met the observed
symptoms!
However, I dismissed it because I didn't think enough of the 5MHz-5.5MHz
PTO signal would make it through the MC1496 PTO/XTAL balanced mixer to
provide a viable local oscillator. On 20m - when they use the PTO signal
directly for the Local Oscillator - they switch it directly to the LO
buffer, completely bypassing the MC1496.
It'll be interesting to hear if the rig does tune "the wrong way" - that
would be further evidence that the LO is wrong. A quick check if you
hear CW signals at the 'phone end of 80m and vice-versa might confirm it.
73,
Steve G3TXQ
On 06/09/2016 06:33, rick@dj0ip.de wrote:
THIS MAKES SENSE! It is the only plausible thing that can be going on
because from the logic standpoint, everything is switching as it should.
That will be an easy fix, once I can make time, clean the workbench to make
room, etc.
73 - Rick, DJ0IP
(Nr. Frankfurt, Germany)
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