On 26/01/2014 18:36, Bob McCormick W1QA wrote:
Hi Bob,
I saw this a couple of times yesterday - during the decode process it
appeared that multiple decodes for the same station appeared.
(Unfortunately I thought I had the save decode selected but didn't - I do
now though.)
I have not seen this today ...
Attached is a screen grab snippet showing 4 decodes for K9FE.
The receive audio level meter runs between 30 and 40 - no obvious overload;
there were a couple of JT9 signals on when this was decoded.
These multiple decodes with large signal level differences and equal
spacings either side of the fundamental signal are most likely to be
generated in the TX station audio stages. +/- 120Hz, +/-240Hz, ... and
~20dB down or more are a common case, as you have there. Mixing with PSU
line hum would seem to be an obvious culprit.
Bob W1QA
73
Bill
G4WJS.
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