AN/GRC-9 Radio Set ("Angry Nine")

The AN/GRC-9 (often called the "Angry Nine") was a 2-12 MHz, AM/CW, low power transportable radio set which can be vehicular mounted (as the AN/VRC-34). It was fielded in the late 1940s and used through the Korean War and later in the 1950s. The AN/GRC-9 replaced the SCR-284, SCR-288 and SCR-694 radios and was in turn replaced by the AN/PRC-62 and AN/PRC-74.

Radio Set AN/GRC-9 installed in jeep (TM 11-5820-453-20)
Radio Set AN/GRC-9 installed in jeep (TM 11-5820-453-20).
Click photo for larger image.

Today in WW II: 15 Aug 1940 Peak day for Luftwaffe sorties against England, including bombing in the North of Britain. More ↓
15 Aug 1942 Operation Pedestal, a last ditch attempt to re-supply Malta and avoid surrender to a German blockade, succeeds as tanker SS Ohio and other convoy ships reach Grand Harbour port.
15 Aug 1943 In the Aleutians, US troops land on Kiska Island to retake it from the Japanese ([5-24 Aug].
15 Aug 1944 Operation Dragoon [aka Anvil] invasion of Southern France.
15 Aug 1945 Japanese surrender, remembered as VJ Day (Victory over Japan) in the U.K. [14 August east of the date line, 15 August in Japan].
Visit the Olive-Drab.com World War II Timeline for day-by-day events 1939-1945! See also WW2 Books.

AN/GRC-9 Radio Set System of Components

Radio Set AN/GRC-9 RT-77/GRC-9

Radio Set AN/GRC-9 and Accessories
Radio Set AN/GRC-9 and Accessories.
Click photo for larger image.

The complete AN/GRC-9 is a set of components for operation on Continuous Wave (CW), modulated CW (MCW) or AM from 2 to 12 MHz across three bands. According to TM 11-263 (1956), range is 30 miles on CW, 20 miles on MCW and 10 miles on AM (voice). Operation in a vehicle had shorter ranges, about half the above.

The main AN/GRC-9 component is the receiver-transmitter unit, RT-77/GRC-9, operating on two pre-set frequencies determined by crystal.

In addition to the electronic components, the complete system includes canvas bags, whip antenna mast with counterpoise 1/2 wave sloping wire (and erecting kit), straps, a T-17 microphone, J-45 telegraph key for CW operation, HS-30 head- set and LS-7 speaker.

AN/GRC-9 Power Options

Multiple options are provided for power supply to allow operation using 6, 12, 24 volt DC or 115/230 volt AC sources:

PE-237 vibrator power supply 6,12, or 24 VDC
DY-88/GRC-9 Dynamotor power supply 6,12, or 24 VDC
DY-105/GRC-9 Dynamotor power supply 24 VDC
PP-317 power supply 115/230 VAC
PP-327 power supply 115 VAC

Other options included the GN-58 hand-cranked generator (photo, right) and the PE-162 gasoline engine generator. When operating the receiver only, BA-48 or any dry battery of proper voltage will operate the set.

GN-58 Hand Generator

AN/GRC-9 Technical Manuals

The original technical manual for these radios was TM 11-263 (Air Force TO 31R2-2GRC9-1.) Later revision was TM 11-5820-453-10 Operators Manual and TM 11-5820-453-20 Organizational Maintenance manual.

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