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: 22 Jul 1942 Japanese invade Papua, New Guinea at Basabua then move along the northeast coast of New Guinea to Buna, beginning a long campaign. More 
22 Jul 1942 Daily gassing of Jews from Warsaw begins at Treblinka; 4000 men, women, children killed daily, the largest slaughter of any single community during the Holocaust [22 Jul-12 Sep].
22 Jul 1944 Setbacks in the Japanese war effort force the resignation of Hideki Tojo as Prime Minister of Japan.
Visit the 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.

Find More Information on the Internet

There are many fine websites that have additional information on this topic, too many to list here and too many to keep up with as they come and go. Use this Google web search form to get an up to date report of what's out there.

For good results, try entering this: grc-9 radio. Then click the Search button.

Especially recommended: