[Lowfer] MLS Friday night-Sat. AM

[JD]

It took an hour and 15 minutes, the amount of time covered in the attached 
capture, to get nicely acceptable captures of MLS. The past month and a half 
or so, there have been loud carriers nearby. A strong pair about 50 Hz up 
were joined by a couple more about 50 Hz below. In addition to depressing 
the receiver's gain through AGC action, the beat notes produced lots of 
distortion products in the audio chain external to the receiver, which 
started showing up in the Argo window!

None of those lines were present as RF where they show in the waterfall, 
fortunately, so if I could get rid of at least some of the real RF sources, 
the distortion products might also go away.  It took a lot of playing with 
the dual passband shift, aided by a couple more Argo windows running QRSS3 
and NDB modes to guide what I was doing without also depressing the signal, 
but I finally found a good compromise.  Then QSB set in, so I wasn't sure 
for a while longer whether it worked.

Fortunately, it did.  The last capture here even showed up nicely in QRSS30 
Normal speed.

(Sorry, I meant to post this one in the wee hours of the morning, but I 
literally fell asleep at the keyboard, and then later in the morning got 
busy with all today's captures.)

John 
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