References:
https://f5xg.jimdo.com/antennes/syst%C3%A8me-duo-bande-2-4ghz-10ghz/
http://www.hb9afo.ch/articles/pll-lnb/10ghz_pll-lnb.htm
https://www.oe7forum.at/viewtopic.php?f=7&t=284&start=135#p1519
https://www.qsl.net/zs6bte/LNB%20Test%20Results.htm
https://forum.amsat-dl.org/index.php?thread/7-modification-of-octagon-oslo-pll-lnb-for-external-frequency-reference/