Jim, when the amplifier moves from A, to AB, to B,
to C, to D, to E all the rules change.
With high powered FETs much different things are
possible. AM MW transmitters are now digital.
Their design is more like a switching power supply
than a RF amplifier. I use a RF power supply running
at 13.560 MHz. It has four MRF150 FETs and a narrow band
pass filter on the output to filter out the switching
noise. The filter has three stages. It is not a simple
matching network.
Regards, Jim FitzSimons W7ANF
Jim Reid wrote:
>
> This is long, wordy! Delete NOW if of no interest.
>
> Note: apologies for my errant post of an incomplete
> draft of the following note, here is what I had intended
> to post when complete. The miss-post also retained the
> subject about low vswr which I also intended to change
> before posting, Jim Reid, KH7M
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