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====== AN/GRC-26 radio teletype system ======
Produced by various U.S. manufacturers.

The high-performance AN/GRC-26 radio teletype station was used by the U.S. Army in different configurations and was also used by the German Armed Forces after 1956. In addition to a transmitter, the station equipment included two receivers and two teleprinters with the necessary accessories, which were usually housed in a shelter on a lorry.

The predecessor station in the Second World War was the SCR-299 / SCR-399 radio station, which was introduced in Switzerland as [[http://armyradio.wiki/doku.php?id=de:se-402|SM 46 or SE-402]].

{{:images-small:mil-usa-an-grc26.jpg?direct&400|AN/GRC-26}}
===== Technical data =====
  * [[Principle]]: Radio station with separate receivers and transmitters
  * [[Operation modes]]: [[A1]], [[A2]], [[A3|AM (A3)]], [[FSK|F1B, F2b (FSK)]]
  * [[Frequency range]]: SW (2 - 18 MHz)
  * [[Frequency display]]: Analogue dial
  * [[Frequency memory]]: none
  * [[Signal strength indicator]]: [[S-meter]]
  * [[Signal processing]]: 
  * [[Features]]: 
  * [[Sensitivity]]: [[A3|AM (A3)]] / [[Selectivity]]: kHz (-6/-60 dB)

==== Power supply ====
  * Mains operation]]: 115 V, from mains or generator PE-95

==== Dimensions ====
  * mm, weight kg

==== Accessories ====
  * HS-30 headphones or LS-3 loudspeaker
  * Hand-held microphone T-17 or dynamic microphone T-50
  * Knee morse key J-45

----

===== Station material =====
The equipment of the shortwave teletype station is housed in a shelter on a offroad truck; the original sets were replaced in various stages.

==== AN/GRC-26 (1950) ====
  * [[Transmitter]] BC-610 (-F or -G) or T-213; 2 - 18 MHz, 400 watts
  * Frequency converter O-39/TRA-7; 2 - 6 MHz (frequency shift exciter)
  * BC-614 modulation amplifier
  * Antenna tuning unit BC-939-A
  * Two receivers [[BC-342]] or R-336
  * Diversity adaptor CV-31B/TRA-7
  * Two teleprinters TT-55, one teleprinter TT-56 with tape punch
  * C-292 teleprinter connection device
  * Whip antenna 4.5 m or dipole antenna
  * Frequency meter [[BC-221]]

==== AN/GRC-26A / B / C (1956) ====
  * [[Transmitter]] BC-610 (-H or -I); 2 - 18 MHz, 400 Watt
  * Frequency converter O-39B/TRA-7; 2 - 6 MHz (frequency shift exciter, transmitter side)
  * BC-614 modulation amplifier
  * Antenna tuning unit BC-939-B
  * Two [[Collins]] receivers [[R-388A]]
  * frequency converter CV-182 (440 - 510 kHz) (FSK converter, receiver side)
  * one teleprinter TT-4A
  * C-808 teleprinter connection set
  * Whip antenna 4.5 m or dipole antenna
  * [[BC-221]] frequency meter
The A version of the AN/GRC-26 radio teletype station was supplied to the early Bundeswehr in 1956; the SCR-506 and AN/GRC-9 sets were often used to communicate with.

==== AN/GRC-26D (1956) ====
  * [[Transmitter]] T-368; 1.5 - 20 MHz, 400 - 450 Watt
  * MD-239 frequency converter (frequency shift exciter, transmitter side)
  * Antenna matching device BC-939-B
  * Two [[Collins]] receivers [[R-390A]]
  * frequency converter CV-116B (frequency shift converter, receiver side)
  * Two TT-98 teleprinters, one TT-76 teleprinter with hole punch
  * Whip antenna 4.5 m or dipole antenna
In the D version, the AN/GRC-26 radio teletype station with the modernised T-368 transmitter and two [[R-390A]] receivers was introduced around 1962.

===== Technical principle =====
Radio teletype station with one transmitter, two receivers, one FSK modulator and one FSK modem, two teletypewriters and one teletypewriter / tape punch.

==== Components ====
The station is fully equipped with tubes.

===== Technical documentation =====

==== Development ====
{{gallery>:images?mil-usa-an-grc26*.jpg&0&80x80&lightbox&showtitle&titlesort}}
==== Further information ====
* [[https://www.radionerds.com/index.php/AN~GRC-26|AN/GRC-26 on the website of www.radionerds.com]]