Reed,
I have seen the same reduced signal in CW mode during key up just prior to time out.? That has been with both my v4 and v5 rigs.? I have always assumed that it was going back to TX in SSB mode for the short interval and some noise was in the audio section causing the small carrier.? It may be the same BFO bleed through as in the SSB audio.
As to "balancing" the BFO mixer, the term is used when you have discrete diodes, and can involve bias resistor adjustment, or diode selection.? The Matched diodes in the BAT54SL chip do not have balancing capability.? The only thing you could check is if both diodes are working.? Unless you remove the chip, static tests will not work in the circuit.? I did check with an oscilloscope and verified that I was seeing both diodes rectifying the BFO.? What I assumed is that the imbalance is due to slight miss match of the output to the crystal filter pad.? In my research on line into balanced mixers, the balance only works if impedances are matched.?
Just suggestions and observations on my part.? I may be wrong and any of the above points.
73
Evan
Ac9TU
