[Amps] Alpha 87a

[Peter Chadwick]

Tom said:
>That theory absolutely does not work.<
Well, I only quote the man. Regrettably, he is SK, so we can't ask him............
However, depending on the class of operation of the amplifier, there will a greater or lesser degree of harmonic energy in the cathode current pulses: a low Q network can reduce these, but the effects on measured SWR will be there. When we used slotted lines (remember them?) at UHF, they had tuned detectors, so wouldn't have that problem. Not very practical at HF......The driving transceiver should, (if it meets modern requirements) have harmonics at least -50dB down, so the harmonics from the driver are unlikely to be the cause of the SWR reading - which as Tom says, can indicate a poor SWR when it's actually a good one.
73
Peter G3RZP