I know nothing about this additional prototype:
AN/URC-8 (XN-2) Trans-Receiver Radio Set.
CBS LABS NEW YORK
NAVSHIPS 92927
Info from John K4OZY:
First, a thousand thanks to Ken Bodensteiner @ Rockwell/Collins who came up with
some advertising brochures for the URC-8. Turns out it was intended as a
replacement for the TCS! You can view the brochures by clicking here: URC8
Brochure [PDF File]
URC-8 consists of
Mil Name | Collins Part # | Description |
---|---|---|
R-627 | 522-9273-004 | Receiver, 2-30 Mc, 4 bands, AM/CW only, 2 mech filters, 107 lbs PTO or xtal control internal p/s - 115/230 v ac input 50-60 or 400 cps |
T-474 | 522-0583-006 | Transmitter, 2-30 Mc, AM/CW, 102 lbs PTO or xtal control 42w output to 15-35' whip antenna |
PP-1190 | 522-0584-006 | Power supply for transmitter, 137 lbs 115/230 v ac input 50-60 or 400 cps |
Optional Motor-Generators | ||
PU-340(XN-1)/U | -- | 12 v dc input |
PU-340(XN-1)/U | -- | 28 v dc input |
PU-340(XN-1)/U | -- | 115/230 v dc input |
Thanks to Jim Jones (W0NKN) @ Rockwell/Collins for the Collins P/N's! URC-8 is listed on various military equipment lists, which generally say that the receiver requires PP-1190. This is clearly not the case, as the receiver has an internal power supply (see pix below). The PP-1190 must, therefore, power the T-474. There's also an auxiliary DC Converter (187 lbs) that allowed running the set off a variety of DC and AC supply voltages.
The manuals are NAVSHIPS 92831 and 92927 (1957). Robert Downs (THANKS!) supplied the following additional info:
Old Number | New Number | Description |
---|---|---|
NS 92831 | -- ? | RADIO SET AN/URC-8(XN-1), IB 26 JUL 1956 |
NS 92927 | 0280-LP-417-2000 | RADIO SET AN/URC-8(XN-2), IB JAN 1957 |
Anyone know the cross-reference for the 92381 document?
If you have ANY information about this receiver or the URC-8 equipment group, please send me mail
T-474(XN-1)/URC-8 |
T-474(XN-1)/URC-8 |
T-474(XN-1)/URC-8 |
R-627(XN-1)/URC-8 |
R-627(XN-1)/URC-8 |
PP-1190(XN-1)/URC-8 |
Nick's June 2011 notes on R-627/URC-8 s/n 4 - Dual conversion, general
coverage 2-30 mc in 4 bands.
One piece of info says 455kc 2nd IF and there are two empty mechanical filter
sockets in the IF/BFO/AF module
There is a 70H-10 PTO (2.58-4.58 mc) as the HF oscillator.
I had been trying to figure out the conversion scheme and beyond figuring the
PTO was multiplied as follows, had been scratching my head as I saw only one
crystal socket that could act as the fixed LO for the 2nd converter.
Band (mc) multiplier
PTO x multiplier (mc)
2-4
x1
2.58-4.58
4-8
x2
5.16-9.16
8-16
x4
10.32-18.32
16-32
x8
20.64-36.64
Then eureka, I finally found 4 xtals buried deep within the RF deck - this is a
really compact bugger, but with flashlight and magnifier I managed to read the
freqs. Here is my guess at the conversion scheme - using mid-band for
illustrative purposes.
(freq in kc)
RF input PTO x mult 1st-IF
XTAL 2nd-IF
3000
3580
580 1035
455
6000
7160
1160 1615
455
12000 14320
2320 2775
455
24000 28640
4640 5095
455
Yep, I found a couple of IF transformers with 4 coils/housing so it probably
really does have a different 1st IF for each band.
And the extra xtal socket I had identified earlier is for the 100kc calibrator
xtal.