[600MRG] XJM WSPR w/ G11
Eric Tichansky
no3m at no3m.net
Thu Jan 24 15:37:23 CST 2013
Back on WSPR-2, 474.2 USB. G11 SDR now driving amp to 80W (5W ERP).
Apparently there was no antenna problem last night. The G11 SDR was
emitting a spurious signal (or wideband noise) that was causing
reflected power due to narrow antenna bandwidth.
I performed the TX image rejection and LO rejection adjustments and that
seems to have settled long term stability, but still getting some kind
of spurious emission on key-down indicated by a brief spike in SWR
before it settles.
A few other issues so far: GSDR (ported PowerSDR) is not indicating
Power or SWR. This is apparently a software issue. CW is difficult as
it's clipping part of the first character in Semi-breakin. Works fine
in MOX (manual PTT); however, still indications of the above spurious
emission problem when first keying. Hopefully some feedback from the
designer/software dev to mitigate the problems.
Otherwise, seems to be a nice little 600M rig. RX seems to be doing well.
73 - Eric NO3M, WG2XJM
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