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Old April 27th 11, 11:32 PM posted to rec.radio.amateur.antenna
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First recorded activity by RadioBanter: Mar 2007
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Default Transmitter Output Impedance

JIMMIE wrote:

Being aware that this was the nature of my solidstate transceiver I
attempted to use a tuner with one to improve my match to my antenna
system. While I didnt damage my transmitter I did notice that the best
settings of the tuner for TX and RX did not coincide. I was wondering
if anyone else has observed this .


Not surprising at all.

Consider the whole black art of adjusting the input match for lowest
noise figure, which may or may not coincide with the largest output
signal for a given input.

All those theorems about matching always have an asterisk about the
assumption that they're reciprocal linear devices with constant
impedances, etc. Start putting nonideal active devices in the mix, and
life gets interesting.
 
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