[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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