I also think phase noise is the likely culprit. A look at the
field day writeup in their club newsletter shows no K3s or K2s
in their photos. The only rig mentioned specifically was an Icom
IC-756PRO3 for their GOTA station and the photographs show a 3
element beam. In response to an email they said they were
running 100 watts on all of their transmitters. I think 100
watts with a standard transmitter on PSK might be in the worst
part of the performance envelope.
My guess was that their signal might have been as much as 8 dB
stronger than that of our nearby CW station. They were about 1/2
mile from us and our CW and digital antennas were about 600'
apart. I calculate 13dB for the power difference, minus 12dB for
the inverse square law, and a wild guess of an additional 7dB
for the antenna patterns. They were a lot closer in frequency
than our CW operation (1 KHz vs 20-60 KHz) which doesn't help.
Cheers - Bill, AE6JV
On 6/27/13 at 10:16 PM, [email protected] (Eric Swartz WA6HHQ -
Elecraft) wrote:
Its much more likely they had wide band TX phase noise that was
causing your problems. (Unless they were running K3s :-) There
is not much on the receive side that you can do to eliminate that.
-----------------------------------------------------------------------
Bill Frantz | QRP: So you can talk about | Periwinkle
(408)356-8506 | the ones that got away. | 16345
Englewood Ave
www.pwpconsult.com | | Los Gatos,
CA 95032
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