AN/GRC 26

Voici un premier article d'une nouvelle série concernant les stations radio US de la seconde guerre mondiale, utilisées par la suite par les Transmissions françaises, cela rappellera des souvenirs à certains d'entre vous.
Par manque de temps je n'ai pas traduit la documentation, mais celle-ci reste largement compréhensible dans son ensemble, cependant pour ceux qui en désire une, copiez le texte dans un convertisseur en ligne comme Google Tranlate .

The AN/GRC-26 Series

 

The first high power mobile radio systems were the SCR-299, and later the SCR-399, during WWII.  It was from these that the first AN/GRC-26 evolved in approximately 1950.  The early sets were installed in GMC CCKW 2-1/2 ton trucks and eventually were mounted in many different 2-1/2 ton series of trucks.  My unit had the 26A version mounted in M-211 and M-135 GMC trucks in 1969.  We will list the components found in each version, in the sections below.

SCR 399

From The Manual

The 26 series consists of a transportable assembly of equipment providing facilities for transmission and reception of radio teletype signals on an frequency shift basis over a frequency range of 2 to 18 Mhz. Maximum power output is approximately 400 watts.  Facilities are provided for operation of full duplex, half duplex or one way reversible circuits. CW and AM may be used alone or simultaneously with teletype operation. Shelter S-55/GRC, containing all the communication equipment is normally transported by a 2-1/2 ton cargo truck.  Power unit PE-95(*), installed in a 1 ton trailer, is towed by the cargo truck.  The complete radio set may also be transported in a C-82 aircraft.
CW and voice can be used in motion or at a halt. For teletype communication it is recommended that the vehicle be brought to a halt.
For mobile, one way reversible operation, three whip antennas are used; two for receiving and one for transmitting.  Mobil at halt operation normally utilizes whip antennas.  If time permits, however, a doublet transmitting antenna should be erected to improve transmitted signal strength.  For semi-fixed installations, doublet antennas are used for both transmitting and receiving with two receiving antennas for dual space diversity reception.
The internal equipment consists of Joint Army/Navy receivers, transmitter, teletype equipment and radio teletype components.  These have been modified for this application.  Components of the radio teletype equipment are in special, compact, shock mounted cabinets to allow them to be located in a limited amount of space.  All operating components are located on tables and shelves in the shelter.

The "Plain" Model

• Radio Set, AN/GRC-26
• JAN Type: AN/GRC-26
• Nomenclature: Radio Set
• Reference: TM 11-264, TM 11-5820-202-XX
• NSN: 5820-00-186-9250
• Transmitter: T-213/GRC-26 (modified BC-610(*)
• Receivers: (2) R-336/GRC-26 (modified BC-342-N)
• Power Unit: PE-95-G
• Frequency Shift Exciter: O-39B/TRA-7
• Dual Diversity Converter: CV-31B/TRA-7
• Page Printers: (2) TT-55/MGC
• Reperforator-Transmitter: TT-56/MGC
• Antenna Tuning Unit: BC-939()
• Control Box: C-345A/MRC-2
• Control Unit: C-292B/TRA-7
• Radio teletypewriter Control: C-535/GRC-26
• Radio Set Control: GRA-14
• Shelter: S-55/GRC
• Weight: 5660 +/- Lb.
• Size: 2-1/2 Ton Shelter
• Mode: TX: 6A3, 0.1A1, 1.1A1, RX: 6A3, 0.1A1, 1.1A1, 3A3A
• Frequency Range: TX: 2.0-18 MHz, RX: 0.5-18 MHz
• Power Input: 115 VAC 50-60 Hz
• Power Output: AM: 400W, CW: 450 W
• Number of Channels: Continuous Tuning
• Updated by: GRC-26A
• Replaced By: GRC-122
• Remote Control: GRA-14
• Description: The GRC-26 is a medium-power, shelter-mounted, radio teletypewriter station designed for use in mobile, fixed, or semi fixed application. In addition to the RATT operation, it is also capable of AM voice and CW communications. Not compatible with speech security devices. Capability for space diversity operation with two receiving antennas spaced 600 to 900 feet apart.
• Source: TM 11-264, 1950; Signal Reference Data ST 11-154-2
• Manufacturer: Hallicrafters,  B & W,  AMF and Avco
• Cost: $10,793
• Produced: 1950-????

The "A" Model

• Radio Set, AN/GRC-26A
• JAN Type: AN/GRC-26A
• Nomenclature: Radio Set
• Reference: TM 11-5820-202-XX
• NSN: 5820-00-186-9250
• Transmitter: BC-610(*)
• Receivers: (2) R-388/URR
• Power Supply: PP-712(*)/GRC-26A
• Oscillator: O-39(*)/TRA-7
• Frequency Shift Converter: CV-182(*)/GRC-26A
• Page Printers: (2) TT-55/MGC; Later TT-4A/TG
• Reperforator-Transmitter: TT-56R; Later TT-76
• Radio Frequency Tuner: BC-939
• Teletypewriter Control: C-808/GRC-26A Radio
• Radio Set Control: GRA-14
• Weight: 5660 +/- Lbs.
• Mode: TX: 6A3, 0.1A1, 1.1A1, RX: 6A3, 0.1A1,1.1A1, 3A3A
• Frequency Range: TX: 2-18 MHz, RX: 0.5-32 MHz
• Power Input: 115 VAC 50-60 Hz
• Power Output: AM: 400W, CW: 450 W
• Number of Channels: Continuous Tuning
• Updated by: GRC-26B
• Replaced By: GRC-122
• Security Devices:
• Remote Control: GRA-14
• Description: The GRC-26A is a medium-power, shelter-mounted, radio teletypewriter station designed for use in mobile, fixed, or semi fixed application. In addition to the RATT operation, it is also capable of AM voice and CW communications.  Not compatible with speech security devices. Capability for space diversity operation with two receiving antennas spaced 600 to 900 feet apart.
• Source: TM 11-264A, 1958, Signal Reference Data:  ST 11-154-2
• Produced: 1953-????

The "B" Model

• Radio Set, AN/GRC-26B
• JAN Type: AN/GRC-26B
• Nomenclature: Radio Set
• Reference: TM 11-5820-202-XX
• NSN: 5820-00-186-9250
• Transmitter: BC-610(*)
• Receiver: 2 ea R-388/URR
• Power Supply: PP-712(*)/GRC-26A
• Oscillator: O-39(*)/TRA-7
• Frequency Shift Converter: CV-182(*)/GRC-26A
• Page Printers: (2) TT-4A/TG
• Perforator-Transmitter: TT-56
• Radio Frequency Tuner: BC-939
• Radio Teletypewriter Control: C-808/GRC-26A
• Radio Set Control: GRA-14 R
• Weight: 5660 +/- Lbs.
• Mode: TX: 6A3, 0.1A1, 1.1A1, RX: 6A3, 0.1A1, 1.1A1, 3A3A
• Frequency Name Range: TX: 1.5-18 MHz, RX: 0.5-32 MHz
• Power Input: 115 VAC 50-60 Hz
• Power Output: AM: 400W, CW: 450 W
• Number of Channels: Continuous Tuning
• Updated By: GRC-26C,D
• Replaced By: GRC-122
• Security Devices:
• Remote Control: GRA-14
• Description: The GRC-26B is a medium-power, shelter-mounted, radio teletypewriter station designed for use in mobile, fixed, or semi fixed application. In addition to the RATT operation, it is also capable of AM voice and CW communications.  Not compatible with speech security devices. Capability for space diversity operation with two receiving antennas spaced 600 to 900 feet apart.
• Source: Signal Reference Data ST 11-154-2
• Produced: 1955-????

The "C" Model

• Radio Set, AN/GRC-26C
• JAN Type: AN/GRC-26C
• Nomenclature: Radio Set
• Reference: TM 11-5820-202-XX
• NSN: 5820-00-186-9250
• Transmitter: BC-610(*)
• Receivers: (2) R-388/URR
• Power Supply PP-712(*)/GRC-26A
• Oscillator: O-39(*)/TRA-7
• Frequency Shift Converter: CV-182(*)/GRC-26A
• Page Printers: (2) TT-4A/TG
• Perforator-Transmitter: TT-76/GGC
• Radio Frequency Tuner: BC-939
• Radio Teletypewriter Control: C-808/GRC-26A
• Radio Set Control:GRA-14
• Weight: 5660 Lbs.
• Mode: TX: 6A3, 0.1A1, 1.1A1, RX: 6A3, 0.1A1, 1.1A1, 3A3A
• Frequency Range: TX: 2-18 MHz, RX: 0.5-32 MHz
• Power Input: 115 VAC 50-60 Hz
• Power Output: AM: 400W, CW: 450 W
• Number of Channels: Continuous Tuning
• Updated By: GRC-26D
• Replaced By:GRC-122
• Security Devices:
• Remote Control:GRA-14
• Description: The GRC-26C is a medium-power, shelter-mounted, radio teletypewriter station designed for use in mobile, fixed, or semi fixed application. In addition to the RATT operation, it is also capable of AM voice and CW communications.  Not compatible with speech security devices. Capability for space diversity operation with two receiving antennas spaced 600 to 900 feet apart.
• Source: Signal Reference Data ST 11-154-2
• Produced: ????-????

The "D" Model

• Radio Set, AN/GRC-26D
• JAN Type: AN/GRC-26D
• Nomenclature: Radio Set
• Reference: TM 11-5820-256-XX
• NSN: 5820-00-518-0398
• Transmitter: T-368/URT
• Receivers: (2)  R-390/URR
• Modem: MD-239
• Converter: CV-116
• Page Printers: (2) TT-98
• Perforator-Transmitter: TT-76/*
• Radio Frequency Tuner: TN-339
• Weight: 5660 Lbs.
• Mode: TX: 6A3, 0.1A1, 1.1A1, RX: 6A3, 0.1A1, 1.1A1, 3A3A
• Frequency Range: TX: 1.5-20 MHz, RX: 0.5-32 MHz
• Power Input: 115 VAC 50-60 Hz
• Power Output: AM: 400W, CW: 450 W
• Number of Channels: Continuous Tuning
• Replaced By: GRC-122
• Security Devices:
• Remote Control: C-1474/GRC
• Description: The GRC-26D is a high power, shelter-mounted, radio teletypewriter station designed for use in mobile, fixed, or semi fixed application. In addition to the RATT operation, it is also capable of AM voice and CW communications.  Not compatible with speech security devices. Capability for space diversity operation with two receiving antennas spaced 600 to 900 feet apart.
• Source: Signal Reference Data ST 11-154-2
• Produced: 1961-????