Re: output impedance: Not the output impedance, but the optimum safe
load impedance. The actual output impedance is generally a lot lower.
The value being matched to 50 ohms is approximately, but less than, the
supply rail voltage divided by the maximum safe current, for the output
device, but more generally will such as to maximise the available output
power subject to keeping the output stage within the safe operating
area, and avoid clipping, whilst, in conjunction with any safety
measures, tolerating a significant divergence from the nominal 50 ohms.
Re: position of capacitor: A capacitor in the shack can act like an
inductor, at the antenna.
Also all of these things are only strictly true for a completely pure
sine wave.
--
David Woolley
On 30/09/2024 21:23, Al Lorona wrote:
what the output matching network of the final amplifier in their
transmitter does to bring the transmitter's output impedance to 50 ohms.
> that a capacitor down in the shack acts differently than a capacitor
> up at the antenna?
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