[amsat-bb] UHF Reference frequency for setting ppm offset in SDR.

[Roy Dean]

I did a google search on how I could better calibrate my el-cheapo SDR to
receive HuskySat-1 (I use NOAA weather stations to calibrate roughly to
VHF), and I found this article by WA1CYB:

https://www.amsat.org/wordpress/wp-content/uploads/2018/02/2017Symposium-SDR-Freq-Calibration.pdf

Sure enough, Channel 17 had a strong pilot tone at 488.309441 for me to use
as a half-way decent reference!    Hoping this can help others in the
future.

--Roy
K3RLD