[Lowfer] Tuesday in the field... (was: 'Monday In'...)

[us66soft at aol.com]

My original plan was to stich together both the previously mentioned 
Tuesday NC trace and the SiW & MP traces over the span of half an hour, 
then synchronize them into one image.  Very busy day, however, so that 
didn't happen!  Here's a more modest two-captures-into-one that still 
illustrates what happened pretty accurately.  I think I've got NC 
synched within about a second of the other two.  Just imagine the whole 
thing being repeated time and again over the course of the 
afternoon...sometimes a receding Doppler shifted copy of the signal 
appears next to SiW and MP, almost but not always entirely 
simultaneously.  Sometimes it goes away again for a while.  Other 
times, the "original" signal fades and the Doppler copy is the dominant 
one for several seconds.   Meanwhile, NC fades in and out but remains 
substantially constant in frequency and does not bifurcate.

Apparently, dual traces have not been uncommon on 10 meters lately, 
too.  KC0TKS and KL7UK both sent me some fascinating captures.  The one 
Laurence sent was taken about two hours before the attached image.  
Wonder what about the ionosphere could be moving that fast on a 
continuous basis, in the same direction, for that long a time?


-----Original Message-----
From: us66soft <us66soft at aol.com>
To: lowfer <lowfer at mailman.qth.net>
Sent: Wed, Nov 30, 2011 1:33 am
.... There were two sustained episodes where (HF) MP and SIW
split up into two spectral lines each, about 1 Hz apart.  When either
of the stations was strong enough to hear, its beat note with itself
was distinctly audible.  Both MP and SIW went into this odd behavior at
the same time, and it ended at the same time.  For what it's worth, I
was simultaneously running an Argo instance on NC, which did NOT
exhibit anything similar!
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