[Elecraft] Propagation Modes
VR2BrettGraham
[email protected]
Mon Aug 11 05:01:00 2003
G3YMC continued on K2VCO's comment about hearing his own echoes
between CW characters:
>Both myself and Steve GW4ALG experienced this phenomenon last year in
>the ARRL 10m contest while running our K2s at 5W. At first I didn't
>believe my own ears - ie I was hearing my own morse coming back in
>the QSK gaps - until Steve confirmed he had heard the same. Chordal
>hop is one theory, but certainly the signals seemed to have come
>right back round the world - working yourself on long path! You
>certainly don't need high power, but not heard it lately in the
>present lousy conditions.
Hearing yourself like this is common when the band is open to SP & LP at
the same time & the F/B on the antenna is not so good. Sometimes I've
found LP to be better than SP _despite_ the additional hurdle of overcoming
F/B...
Absolutely no fun when one's antenna has no F/B, or when the station you're
working is coming through both directions at about the same strength - the
slight additional delay on the LP does a pretty good job of making it sound
like a slightly amplitude-modulated carrier.
73, VR2BrettGraham