I am going to attempt to use 2 identical monoband tube amplifiers to generate
CP but before I start I have a question. The 90 deg delay for CP comes from the
array orthogonal physical boom separation. So the amplifiers must be in phase
at the outputs.
I presume that this has been done in broadcast applications and I would like to
know, assuming everything is tuned correctly how close the phase likely to be?
I have line stretchers for the inputs, I have extremely good phase matching on
the Wilkinson splitter and 2 identical directional couplers that I have tuned
for good phase and amplitude matching. I can also measure the relative
amplitude and phase of the 2 amplifiers accurately. Small phase and amplitude
adjustments are ok but I have no idea what to expect with tube amplifiers.
This was not really planned but a 2nd amplifier became available, so I thought
why not? The tubes are becoming scarce so this way I can be a lot more gentle
on them.
Regards, Conrad PA5Y
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