[RFI] Is My Radio Possessed?

N4ZR n4zr at comcast.net
Tue Aug 15 10:32:24 EDT 2017

73, Pete N4ZR
Check out the Reverse Beacon Network
at <http://reversebeacon.net>, now
spotting RTTY activity worldwide.
For spots, please use your favorite
"retail" DX cluster.

Looking for an explanation for a weird experience I recently had, which 
*may* fall in the category of RFI.

I was tuning my K3 across 40M CW during theWAE CW contest, while at the 
same time watching the band using HDSDR with my QS1R, which was also 
running CWSL_Tee and both CW and RTTY Skimservs.  The QS1R's antenna was 
being split off the K3's external antenna loop.

I noticed on the HDSDR waterfall what looked like SSB signals, way down 
in 40 CW (one even below the band edge). Curious, I tuned several of 
them in on HDSDR. All were obviously hams, and I inferred from what they 
said that they were on 40 phone.  Even weirder, the signals were on 
upper sideband!

After a few minutes of this, I shut down both Skimservs and turned my 
attention back to the contest.  When I returned a few minutes later, 
HDSDR showed NO SSB signals at all down in the CW band, even with the 
two Skimservs restarted. It has not recurred.

More information about the RFI mailing list