View Single Post
  #13   Report Post  
Old June 5th 08, 02:02 PM posted to rec.radio.amateur.antenna
Cecil Moore[_2_] Cecil Moore[_2_] is offline
external usenet poster
 
First recorded activity by RadioBanter: Mar 2007
Posts: 3,521
Default What effect does a tuner have at the antenna?

AI4QJ wrote:
"Cecil Moore" wrote in message
If we adjusted the tuner for maximum forward power
at the antenna, wouldn't that mean the tuner was
properly tuned for a Z0-match at the transmitter?


I think it would be essentially true for today's FET transmitters that
automatically limit output power when the Z0 is not matched, but not for any
reason having to do with transmission line theory.


Let's see what is wrong with the following reasoning:

1. Maximum power is delivered to a mismatched load
when the forward power is at a maximum.

2. Maximum available power is delivered to the load
when the source sees its designed-for impedance, e.g.
is Z0-matched.

Why wouldn't the forward power at the antenna be
maximized by a Z0-match at the source while the
tuner is being adjusted?
--
73, Cecil http://www.w5dxp.com