Have the schematic for an army RX type R-19D 17 tube FM rx. What was it used
for ?

Ralph

If this is the R-19/TRC-1, 70-100 Mcs, it was used for point to point
communications...The TRC-1 equipment landed with the troops at D-Day...by
island hopping, and gun platforms, it relayed traffic between the beechs and
England.. The same for Korea, island hopping to Japan... I have always thought
that this equipment (AN/TRC-1) was possibley the best rig to come out of WW-2.
Receive was, double conversion, both oscillators controlled by one
crystal...Transmit, a 1 crystal mc, gave an output at 96 mc, at 50 watts, from
a pair 829s...By using CF-1 and CF-2, carrier equipment, as i recall 4 voice
channals and 12 teletype channals could be carried over the TRC-1...T/Sgt
E.P.Reed USAF Retired Radio repairman 1952-1972...73`s WB7NGI