Radio Teletypewriter Set AN/GRC-46 -1963 US Army Film

The AN/GRC-46 series was a tactical, transportable, Radio Teletype (RATT) station, designed to be mounted on the M-37 series 3/4 ton truck. The AN/GRC-46 series was initially fielded in 1958 and was used up into the 1980s. Army Reserve and National Guard units used them into the 1990s.
The AN/GRC-46 series used the Collins designed, Auto-tune, 100 Watt transmitter, T-195 and the tactical version of the Collins designed R-390 receiver, the R-392. It was powered by 28VDC from the vehicle or an external generator. The teletypewriter equipment consisted of the Kleinschmidt TT-98* page printer and TT-76* reperforator and tape reader. Encryption equipment was originally the TSEC/KW-9 and by 1967, the TSEC/KW-7.
The AN/GRC-46 series stations were used for primary communications at the company level and as back-up for larger communications centers. They operated "one-way reversible", meaning they could send and receive, but not simultaneously. The AN/GRC-46 series was replaced, starting in about 1967, by the AN/GRC-142, which was similar, but had a 400 Watt transmitter. There was a version of the AN/GRC-142, known as the AN/GRC-122 that could transmit and receive simultaneously using separate antennas and a second receiver.
The Antique Wireless Museum has an operational AN/GRC-46B, with part of the shelter cut away for easier viewing.
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[@davidhtims]

I used one if these when I was assigned permanent duty in Frankfurt Germany. Was a well worn unit in 1973. Shortly after w=was replaced with an/grc 122 or 123 units can’t remember which. Was way better.

[@davisnewman8278]

In 1962 I was in the 2ndBG/12th Infantry, !st ID. We used this with the KW-7 cypher machine. We could encrypt/decrypt teletype in line. We sent using the Tape reader. When you typed a message a perforated tape was made. You put the tape in the reader, pushed a button and it would encrypt and send it faster than you could type.

[@WirelessMuseum]

That is a great, concise explanation of how it worked. Thanks.

[@mikemiller3446]

I used one while in Germany 1st/94th FA 1971-1973. It also had a Crypto Box which was the state-of-the-art transmitting and receiving coder/decoder.

[@timothyj1962]

I was in the Army 81-86. I was using either a AN/GRC-142 mounted on a Gamma Goat.or a AN/VSC-3 (housed in a M577 command post carrier). The transceiver was a AN/GRC-106. Affectionally(?) called an "Angry 106. The teletypes were like you see here. A TT-98, and a TT-76 punch tape machine. The Crypto was the KW-7 (wire type). In the latter years the TT-98 was replaced with a AN/UGC-72. Around 1985, news came down that the KW-7 and it's keylist had been compromised. It had been going on for nearly 20 years. Look up the "Walker Spy Case". INT ZBK INT ZBZ K

[@ashadowawhisper]

Just saw one of these bad boys for sale on Facebook Marketplace

[@kfourom]

I used one of these things during my 6 years in the USAR. Never sent a message. Did some rag chewing on 40 and 75, CW on 40 and rtty on 40. Leadership was impressed that we could communicate with anybody. Radio hut was way too small for any long use. I am 6'6" and the other ops were above 6'. The commo section booze was secured in the crypto safe.

[@user-lo7dy9yk5n]

ER Baseball 😮🎉❤.

[@n8ux1963]

Thanks for uploading this fine historical resource! 73 de N8UX

[@timothyj1962]

N8UX de B9V10 INT ZBK INT ZBZ K