[Lowfer] Daytime lowfers

[JD]

It's been a while since I read the U3s literature, but doesn't the GPS 
correction procedure require an interruption of the output for at least 
several seconds?  From Garry's capture, it doesn't look like that takes 
place very often, which may be why the thermal effects have ample 
opportunity to show up.

Even on the WM HiFER, which starts each ident cycle pretty much right on 
frequency, just the heat build-up of the device being keyed on sometimes 
causes a downward drift before key-up again, and that's a shorter time 
period than I think we're looking at in this case.

Attached is what I saw in SE Kansas last night from a little before sunset 
to an hour after. The pair of curved traces is probably WM, based on the 
spacing of the DFCW dashes matching what Garry captured. For reference, here 
is also what I captured from SIW during roughly the same hour and a quarter; 
same receiver, two different Argo screens, 800 Hz = 185.300 kHz within 0.1 
Hz.


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