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Re: SWR on a receive-only antenna



-----Ursprüngliche Nachricht-----
Von: Gunther Meisse <gjmouse@neo.rr.com>
An: amsat-bb@AMSAT.Org <amsat-bb@AMSAT.Org>
Datum: Mittwoch, 6. März 2002 04:37
Betreff: [amsat-bb] SWR on a receive-only antenna


>I seem to remember that in a receive-only antenna the SWR is of little
>consequence. IS THAT CORRECT?


A 1:1 SWR means perfect match between your 50 Ohm coax
and the radiated waves (impedance of the medium).
AND VICE VERSA!

Bad SWR means either reflected waves on the coax input
(when transmitting, shown on the SWR instrument) OR
reflected electromagnetic waves from the antenna
(receive mode, cannot be measured easyly).

An antenna should totally absorb all incoming waves.
If the antenna is mismatched, it won't absorb all energy
but re-radiate it, causing the same dB loss as if used
as mismatched transmit antenna.

73! Ulf, DK9SJ

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