Hi there Paul,

I took a look, the circuit looks good, so why the better method
comment?

If this 455KHz injected "over the air" signal is captured by the
receiver, should the s-meter provide a constant signal level?

If the SSB signal is coming in strong (S9), and the captured BFO level
is S3, will the amplitude of the BFO have to be increased?

How about AGC on the BFO so that its injection level is a function of
signal level?

Thanks again for the information!