[Amps] Phase and amplitude of 2 tube amplifiers

[c miller]

Circular Polarization

Chris 
VE3CEA 
 

Sent from my iPhone

> On Oct 15, 2022, at 11:03, Jim W7RY <jimw7ry at gmail.com> wrote:
> 
> What is CP? Better clue us Americans as to what that is.
> 
> 
> Jim W7RY
> 
> 
>> On 10/13/2022 7:37 AM, Conrad PA5Y wrote:
>> 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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> 
> -- 
> Thanks and 73, Jim W7RY
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