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Old March 20th 06, 11:02 PM posted to rec.radio.amateur.antenna
Dave
 
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Default SWR Tells Me??

jimbo wrote:

SNIPPED


Well, Utah is a little too far away for your offer of help. But, why
shouldn't I measure SWR at the transmitter? Doesn't a SWR of 1.0 at the
transmitter indicate 50 + j0 ohms which is what the transmitter wants?

Thanks, jimbo


It IS what the transmitter wants! But you may be introducing
un-necessary power losses in your coax from any true VSWR 1:1.

It is possible to have a VSWR 25:1 at the antenna and still have close
to 1:1 at the transmitter! REALLY !! Your transmitter is happy. But you
are wasting power heating the coax, not radiating it at the antenna!
This is caused by impedance transformation along the coax. VSWR ~ 1:1 at
the antenna provides best power transfer from coax to antenna.

BTW, I used to live in Kaysville and Layton [ZIP=85015] in the olden
days [30+ years ago]

 
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