[CQ-Contest] WRTC SSB Signal strengths

Don Moman VE6JY ve6jy.1 at gmail.com
Fri Jul 16 21:37:27 PDT 2010

During the IARU contest I made several 200 khz wide spectrum recordings of
the 20m SSB portion with the Perseus SDR, as heard in VE6 land.  The files
and the demo software to play them are located at:


Using the software, you can play back the recordings, tune in any of the
signals, adjust the filter bandwidth and read the signal strengths just as
if you were doing it live.  If you are not familiar with the software you
may need to study the finer points of the manual at
http://www.microtelecom.it/perseus/software.html  . The file names indicate
the center frequency (+-100 khz is recorded) and the UTC time.  The
recordings are about 1 minute long and about 85 megs. These recording were
taken at 1420, 2205 (July 10) and 0342, 0635 UTC (July 11).

We had good band conditions to Europe on 20m for most (I missed a few hours)
of the 24 hours.  The R3xx signals are in there, obviously not the biggest
signals on the band, but quite OK at times.  I suspect that they were not
intentionally beaming our way much of the time. The RX antenna used was a 5
el yagi at 200'.

There are a number of rather over modulated SSB signals, creating wider than
normal signals  that made copy of the weaker ones beside them pretty tough
but also made themselves hard to copy.  Use these recordings to check your
audio quality and bandwidth and perhaps improve things for everyone on the

Similar recordings for the CQ WPX 2010 SSB contest are located at

73 Don

On Sat, Jul 17, 2010 at 4:03 AM, David Thompson <thompson at mindspring.com>wrote:

> The reverse beacon network only records the stations CW strengths.
> A good part of any teams score is made on SSB.
> Only part of the story is told unless there is some
> method to measure the SSB signals on 20 and how effective the teams SSB
> signal was on the other bands.
> Will it take switching to digital voice to populate a SSB skimmer?
> Dave K4JRB
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