This is a survival radio that transmits on either 121.5 or 243 MHz. It's KoreanConflict, Vietnam Era vintage and uses vacuum tubes.
The thing that's most noticable is that it weighs a lot (2lbs 13 oz without the battery or battery cable).
Movie credits: Ice Station Zebra, The Bridges at Toko-Ri, Bombers B-52, Flight from Ashiya, Battle Taxi
This is a Hoffman Radio Corp. RT-159A/URC-4 s/n: 31263
Both V3 & V4 are USAF 6147 pencil tubes.
RT-159A - the doubler tubes V3 & V4 changed from 5851 to USAF 6147 & wiring, resistor, bias and capacitor changes
RT-159B - JAN 2E32 used for V4 after s/n 16,000 CK6397 & JAN5678 used for V3 & V4.
BA-1264/U Mercury Battery
B+: 136/115 (replace at 120)
A: 1.3/1.18 (replace at 1.2)
Manual 5 Oct 1950 revised 5 May 1960
The Y1 crystal in the only crystal in the radio. It's in an axial lead machined cylindrical package and snaps into place just behind V1
Marking engraved on crystal:
CR-24/U CAIJ 30.375 MC
Note: 4 * 30.375 = 121.5 MC
Note: 2* 121.5 = 243.0 MC
Examples of the CR-24/U crystal package:
2 each CZX 28.24000 MC
2 each CCSO 32.91250 MC
What do the letters CAIJ CZX and CCSO mean? Let me know.
|Fig 7 Schematic RT-159A
||Fig 8 Inside V1 at top
||Fig 9 Y1 Crystal
V1 in front of Y1, then V2, then V3 & V4 as a pair.
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