1. THE EVOLUTION OF US CLANDESTINE AND LONG-RANGE-PATROL RADIOS 1940-1970.
Al Klase
11 Mar 2008
Rev. 2.0
2 MAR 2019

2. Short-wave Propagation

3. NVIS Near-Vertical-Incident Sky-wave

4. 15:00Z (3 PM) HAP – Hourly Area Prediction

5. 00:00Z (Midnight) HAP - Hourly Area Prediction

6. 10-foot Whip

7. Low Half-Wave Wire

8. Comparison

9. Data from U.S. Army – 1960’s

10. British B-2 Set
Club member Robert Forte has one of these.

11. AR-11 Compact Transceiver for Covert Action 1942 (?)
There’s one of these in RTM.
4-16 MHz – CW (Morse code) only
Power output approx. 10 watts
110/220-volt AC power
Predecessor to slightly larger AN/PRC-5
Allegedly supplied to the French resistance.
ARF Products, River Forest, Illinois 

12. OSS Radios in WWII SSTR-1 in Use

13. OP-3 (Type 30/1) Polish Agents Personal Receiver
N3FRQ Collection
OP-3 (Type 30/1) Polish Agents Personal Receiver

14. POW Canteen Radio Repro
N3FRQ Collection
These drawings come from United States Army in WWII, The Technical Services, The Signal Corps: The Outcome, U.S. Government Printing Office, 1966, pp
     “Nor was concealed radio activity by Signal Corps men in the Philippines confined to the guerrillas.  There was at least one incident of it in prison, involving a radioman, William D. Gibson, who had received his commission as a lieutenant in the Signal Corps only a few hours before the fall of Corregidor. A former U.S. “ham” working in Manila as a civilian radio technician, he had offered his services to the Army on Corregidor after the enemy invasion began.  But his commission had been delayed till the last hours of his freedom because the medical officers, busily treating wounded men, had not given him the required physical examination.  Subsequently, a prisoner in the Cabanatuan concentration camp, he came into the possession of a 1-tube regenerative radio receiver improvised by an officer of the Engineer Corps, Capt. Russell J. Hutchinson, who had built it of scrap parts and placed it inside a GI canteen.  Hutchinson, on being shifted out of the prison, left it with Gibson.  But the set no longer worked.  Its single amplifying tube, a 12SK7, had burned out. Obtaining a different type of amplifier tube, a 6J7, stolen by an American sailor who had a prison job in a Japanese shop, Gibson, rewired the set to accommodate the tube; a cauterizing iron from the prison hospital served as a soldering iron.  Looking like any ordinary canteen, the radio was kept hanging at the lieutenant's bed.  Japanese inspectors passed it by, suspecting nothing.  Its antenna was a No. 22 wire woven inconspicuously into a rope clothesline.  Only the headphones had to be secreted separately. The prisoners furtively operated the receiver in the evening, using battery power, which was available in the prison hospital.  The little set brought in radio programs emanating from Siagon, Tokyo, and San Francisco.  Best of all was the Voice of Freedom broadcast from the Apache after the Leyte Campaign began.  This treasured radio receiver was left behind when the lieutenant, suddenly freed with other prisoners departed in the pell-mell of the daring Cabanatuan raid, 30 January 1945.

15. AN/PRC-1

16. CMS (U.S. Navy) ca. 1940 3-22 MHz 15 watts- CW Regenerative RX
N3FRQ Collection
3-22 MHz
15 watts- CW
Regenerative RX
Crystal or M.O. TX

17. WWII Field Radios N3FRQ Collection N3FRQ Collection SCR-288 / BC-474
KHz
20 lbs. + Power Supply
SCR-284 / BC-654
KHz
45 lbs. + Power Supply
SCR-694 / BC-1306
KHz
30 lbs. + Power Supply

18. AN/GRC-9 ca. 1947 N3FRQ Collection Backpack or Vehicular Transceiver
RT-77/GRC-9
Backpack or Vehicular Transceiver
Receiver Section, covers 2-3.6, , and MHz continuously tuneable in 3 bands AM-CW, 456 KHz IF, 200 KHz Calibration Points. AF and RF Gain Controls and Headset jacks. Tubes 2* 1L4, 3* 1R5, 1* 1S5, 1* 3Q4. Requires 1.4 and 105 Transmitter Section, covers 2-3.6, , and MHz continuously tuneable, or two pre-set channels, AM-CW, Hi-Lo Out-puts 7 or 1 Watt AM, 15 or 5 Watt CW. Uses 2E22 tubes in power amp. With tubes 2* 1L4, 3* 1R5, 1* 1S5, 3* 3A4, and 1* 3Q4. Requires Amps, and 6.9

19. AN/GRC-9

20. RS-1 – AN/GRC-109 1950 3-22 MHz 15 watts- CW Crystal Controlled TX
N3FRQ Collection

21. RS-1 – AN/GRC-109 Receiver RR-2B Transmitter RT-3
Power Supply RP-1 and RP-2
Weight
10 lbs.
9 lbs.
RP-1: 24 1/2 lbs
RP-2: 12 lbs
Frequency Bands
3-6, 6-12, MC
12-15 W, 3-15 MC
10-12 W, MC
Power Output
30 mW into 4K ohms

22. AN/GRA-71 Burst Keyer
N3FRQ Collection

23. RS-6 N3FRQ Collection Receiver RR-6 Transmitter RT-6
Receiver RR-6
Transmitter RT-6
Power Supply RP-6 and RA-6
Weight
3 lb 2 oz
2 lb 14 oz
RP-6: 5 lb 11 oz
RA-6: 3 lb 11 oz
Dimensions
6-3/4" X 5" X 2-1/4"
6-3/4" X 5" X 2-3/32"
RP-6: 8-1/16" X 4" X 2-3/16"
RA-6: 8-1/16" X 4" X 2"

24. Delco 5300 – AN/PRC-64 1962 N3FRQ Collection
Weight: 7.5 lbs with battery
Dimensions: 10" X 5" X 4.5“
Frequency Bands: 3-8 MC, four crystal channels (separate crystals for xmit and recv)
Power Output: 5 watts CW, 1.5 watts AM
Misc. Specs: Receiver sensitivity: 5 uV AM, 2 uV CW.
AF output: 5 mW into 600 ohms.
Antenna: 50 ohm wire
IF freq: 455 KC.

25. AN/PRC-74 Hughes 1964 2-12 (18) MHz 15 watts- CW, USB
N3FRQ Collection
2-12 (18) MHz
15 watts- CW, USB
Synthesized, 1KHz steps

26. The Radio Technology Museum
New Jersey
Antique Radio Club
Meets: 2nd Friday
David Sarnoff Library
Princeton, NJ
InfoAge
Science/History Learning Center Marconi Road Wall, NJ 07719

27. Military Radio Collectors Association
The Old Military Radio Net
Saturdays - 05:00 Eastern
3885 Khz AM
Sundays – 21:00 Eastern
3570 KHz CW