[SADXA] Frequency Measurement Tests

[Wes]

The latest FMT is over and the results are in.

Prior to the test, in an effort to improve my capabilities I acquired a BG7TBL 
GPS disciplined-crystal-oscillator (GPSDO).  I also acquired, and mounted on the 
roof,a high gain GPS antenna.  I was going to wire this up with RG-6 using 
quality F-connectors. So I bought some RG-6 from DXEngineering using the gift 
certificate I won at one of the club meetings (Thanks K7NN) and ordered some 
crimping tools and connectors from various other sources.  Unfortunately, 
"One-day" shipping now means, "One day we'll get around to shipping your 
stuff."  And thanks to COVID, UPS disavows any promises of delivery dates.

So the external antenna remains unconnected and I had to use one inside my 
concrete block house.  (I won't elaborate about the roof being unsafe for human 
habitation anyway because a swarm of killer bees decided to take up residence in 
my chimney and fireplace.)

For the test K5CM transmitted a signal on 20 meters in the morning local time, 
once with his beam east, the second with the beam to the west.  I was able hear 
and measure both signals. Night brought one 40-meter signal and a couple on 80 
at different times.  Propagation was really random with up to 30 dB fades, 
indicating multi-path with attendant Doppler.

One other wrinkle was that the key down times were only one minute.  This is not 
enough time to do real time FFT analysis, so recording is a necessity.  If 
anyone is interested, I can describe further my setup and technique.  For now 
suffice it to say that while comparatively speaking, I didn't do as well as in 
the last two tests, my worst measurement (40-meters) was within 95 mHz of the 
"official" frequency.

I figure that as long as I can beat this guy 
http://www.k5cm.com/k6OQK%20FMT%20NEW.htm who does this for a living I'm doing okay.

Wes  N7WS