[R-390] R-1247/GRC-129 Information

[Les Locklear]

Found this with a Google search:  http://www.fernblatt.net/m11.html


R-1247/GRC-129
Radio receiver,HF,500 Kc to 32 Mc. High stability version of R-390A/URR 
using external ultra-high-stability oscillators. Used by NASA for the 
Apollo program.
Contract info: Manson Labs, contract AF30(635)30962 ,Part No 224-0A2

Additional info per Tom, N5OFF:
" All the Oscillator outputs were seriesed through sets of 2 DPDT relays 
that
appeared to allow the R390A to use its own Oscillators,Import external 
oscillator
signals,or export its internal oscillators to a set of BNC jacks on the 
rear panel.

By all the oscillators I mean PTO,17Mcy XTAL,and the 1st conversion 
xtal. These
relays required external power via a small connector labled CONTROL.

The relays were Mil Spec commercial units mounted on well machined casts 
that
fit into the OSC tube sockets on the PTO and Hetrodyne osc and the one 
for 17mhz xtal
plugged into the socket for crystal oven. There were 2 small dia. color 
coded coax
cables going to each relay.The R390a worked normally with no connections 
to any of
the connectors."