Other DIODES to consider are the "pin" diodes 1N4007, and also the diodes in the SWR/power measuring circuit.
I don't know if the rf power supply 1n4148s are the problem, but the MFJ QSK unit uses DC 600 volts developed from the power supply of the amplifier to run it.... See:? ?
Just not sure where the harmonic energy is coming from....with the filters looking NICE.? ??
Of course, ANYTHING generated by the "antenna connector"-sided diode would have zero filtering....
Gordon KX4Z
