The Janet 737s have been visiting Goodrich Aviation at KPAE. Comparing page counts from the FAA I already purchased, it looks like on N5294M is the
only 737 that has had it documentation updated. [It is possible the page count record provided by the FAA is wrong.]
I purchased the FAA records for the whole Janet fleet. The 737s are not very fancy.
N623RA is the most up to date of the Beech aircraft, being mode-s equipped. The Beech have UHF radios using dual-band blade antennas. I need to go
back and look if the 737s have mil air. I made a summary of the avionics on the Janets: www.lazygranch.com...
[I put the nitty gritty in a gif to at least make it take some work for other websites to rip me off. ;-)] Ah, I see the 737s have UHF.
Most ATC (now we're back to the base, not the birds) simulcast on VHF and UHF. Groom Lake tower doesn't do this all the time, presumably to make it
harder to find the military frequency, i.e. comsec.