[Elecraft] Fwd: New Sherwood report

[Paul Christensen]

> By the way, if you have a P3 you can see the spikes on make, break, or 
> both on the
> waterfall. You can spot the rigs that are using semi-QSK that have a big 
> spike on the
> first dit and then quiet down, too.

Same with relative SSB IMD monitoring.  I've been looking at the area near 
the SSB carrier set point since IMD is not confused with Tx bandwidth.  Wow, 
some huge differences between stations.  And several ESSB ops with 
emphasized low end are not necessarily a problem.

With a bit of practice you can clearly see the grunge below the set point 
and even call a rough value.  I've seen rough values vary from -20 dBc to 
better than -50 dBc.  On 20m last week, an ESSB op was using a TS-950SDX and 
Alpha 89.  Using the SDR-IQ, he had one of the cleanest spectrums I've seen. 
By contrast, an op using an FT-1000D and ACOM amp showed about -30 dBc   I 
want to emphasize that these are not actual IMD numbers -- only a relative 
IMD indication.

Paul, W9AC