Jerry,
I am still playing with LTspice and have not yet gotten to building the circuits.? In my playing around I did come to the realization that if I did the transformer impedance match I would solve the problem of the 40meter CW drop off.? That would seem to me to then create a receiver sensitivity issue as even with Q90 off, there is still around 320ohms on the C80 side of the transformer that would be transferred to 80ohms on the other side that would be across the antenna input.? Unless switching is added I do not believe that the transformer is viable.? Would you agree with the impedance values???
Attached is the circuit with the transformer.? Here is a screenshot of the transformer analysis in transmit mode.
73
Evan
AC9TU
