ARC-5

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The AN/ARC-5 Command Radio Set is a series of radio receivers, transmitters, and accessories used to provide two-way Morse code and AM radiotelephone communication for U.S. Navy aircraft during World War II and the years following. It was an improvement of the Navy's ARA/ATA command set. Similar units designated SCR-274-N were used in U.S. Army aircraft. The Army set is based on the Navy ARA/ATA, not the later AN/ARC-5.

1 History
2 Specifications
3 Gallery
4 General Documentation
5 References
6 See also
7 External links

[edit] History

The AN/ARC-5 command set was used by the US Navy from the latter part of World War II into the post-war era. It was fitted in many different aircraft types for communication between aircraft, navigation, and communication back to base. Units were available that covered much of the MF, HF, and VHF spectrum. Despite the use of octal base vacuum tubes, they were compact, rugged and light weight. Many became surplus after the war and were often converted for amateur radio use. ^[1] The term "ARC-5" has come to be a generic, though incorrect, term for all similar command set units, including those designed by the Aircraft Radio Corporation in the late 1930s.^[2]

The ancestor of the AN/ARC-5 system was the U.S. Navy's ARA/ATA system, with initial deployment in 1940. The designations ARA and ATA are a pre-WWII Navy equipment nomenclature. The major units of the ARA are five receivers covering 0.19 to 9.1 MHz, each unit with its own dynamotor power supply. The major units of the ATA are five transmitters covering 2.1 to 9.1 MHz, using a common transmitter dynamotor/screen modulator unit. Most units were made by the Aircraft Radio Corporation (USN manufacturer's code CBY). Many units were also made by Stromberg-Carlson (USN manufacturer's code CCT).

To equip US Army Air Corps planes, the US Army adopted in 1941 a reduced set of these radios known as the SCR-274-N that was electrically almost identical to their ARA/ATA equivalents, except for receiver output and modulator sidetone audio transformer output impedance. It was mechanically almost identical except for most later units being left unpainted aluminum in contrast to the black crackle finish of the Navy sets. The designation SCR-274-N is a pre-WWII Army equipment nomenclature. The Army did not acquire a receiver covering 1.5 to 3.0 MHz, nor a transmitter covering 2.1 to 3.0 MHz. Initially, the Army did not acquire a 3.0 to 4.0 MHz transmitter, nor a 0.52 to 1.5 MHz receiver, but need to communicate on the common civil airfield frequency of 3.105 MHz plus the anticipated USAAF use of the AN/ARR-1 homing adapter (see below) compelled adding these units to the SCR-274-N. Early Army units were made by Aircraft Radio Corporation, but the vast majority was made by Western Electric, plus a few by Colonial Radio and others.

The main units of both the Navy and the Army systems were usually installed in three-receiver racks and two-transmitter racks. Units not in service could be stored on board the aircraft, just as one would store tuning units of other types of radio equipment.

In late 1943, the U.S. Navy fielded an improved and more flexible set of radios known under the new Joint Army-Navy (JAN) nomenclature of AN/ARC-5. A receiver and transmitter were added that provide four-channel crystal-controlled VHF-AM operation, along with a rarely encountered set of transmitters that provide coverage of 0.5 to 2.1 MHz.

[edit] Specifications

The following is a table of ARA/ATA, SCR-274-N, and AN/ARC-5 major components that would comprise a typical three-receiver, two-transmitter installation. In addition, several miscellaneous components are listed. A blank in the component ID column indicates that no equivalent unit existed for that system.

	MHz	ARA/ATA	SCR-274-N	AN/ARC-5
Navigation Receiver (Beacon Band)	0.19 - 0.55	CBY-46129	BC-453-B	R-23A/ARC-5
Navigation Receiver (Broadcast Band)	0.52 - 1.5	CBY-46145	BC-946-B	R-24/ARC-5
Communication Receiver	1.5 - 3.0	CBY-46104 (1)		R-25/ARC-5
Communication Receiver	3.0 - 6.0	CBY-46105 (1)	BC-454-B	R-26/ARC-5
Communication Receiver	6.0 - 9.1	CBY-46106 (1)	BC-455-B	R-27/ARC-5
Communication Receiver - Four Channel	100 - 156			R-28/ARC-5
Special Use Transmitter	0.5 - 0.8			T-15/ARC-5
Special Use Transmitter	0.8 - 1.3			T-16/ARC-5
Special Use Transmitter	1.3 - 2.1			T-17/ARC-5
Communication Transmitter	2.1 - 3.0	CBY-52232		T-18/ARC-5
Communication Transmitter	3.0 - 4.0	CBY-52208	BC-696-A	T-19/ARC-5
Communication Transmitter	4.0 - 5.3	CBY-52209	BC-457-A	T-20/ARC-5
Communication Transmitter	5.3 - 7.0	CBY-52210	BC-458-A	T-21/ARC-5
Communication Transmitter	7.0 - 9.1	CBY-52211	BC-459-A	T-22/ARC-5
Communication Transmitter - Four Channel	100 - 156			T-23/ARC-5
Communication Transmitter - Four Channel	100 - 146			T-126/ARC-5
Transmitter Modulator		CBY-50083	BC-456-B	MD-7/ARC-5
Transmitter Modulator Mount		CBY-50084	FT-225-A	MT-76/ARC-5
MF/HF Antenna Relay		CBY-29125	BC-442-A	RE-2/ARC-5
MF/HF Antenna Relay Mount		CBY-29126	FT-229-A	MT-77/ARC-5
Receiver Air-Track ILS Adapter				MX-19/ARC-5
Receiver Homing Adapter Power Adapter		CBY-62036	FT-310-A	MX-20/ARC-5
Receiver Remote Control Adapter		CBY-49107	FT-230-A	MX-21/ARC-5
Receiver Local Tuning Control		A.R.C. 6743	A.R.C. 6743	A.R.C. 6743
Receiver Local Control		CBY-23154 (1)	FT-260-A	C-24/ARC-5
Nav. Receiver ANT-LOOP Remote Control				C-25/ARC-5
Single Tunable Receiver Control Box		CBY-23261	BC-473-A	C-26/ARC-5
Single Lock-Tuned Receiver Control Box				C-27/ARC-5
Single Tunable Receiver Control Mount		A.R.C. 7053	FT-235-A	MT-4/ARR-2
Three-Receiver Remote Control Box		CBY-23251	BC-450-A	C-38A/ARC-5
Three-Receiver Remote Control Mount		A.R.C. 7054	FT-222-A	MT-98/ARC-5
Four-Transmitter Remote Control Box		CBY-23243	BC-451-A	C-30A/ARC-5
Four-Transmitter Remote Control Mount		A.R.C. 7083	FT-228-A	MT-80/ARC-5
Three-Receiver Rack		CBY-46149	FT-220-A	MT-65/ARC-5
Three-Receiver Rack Mount		CBY-46150	FT-221-A	MT-64/ARC-5
Two-Transmitter Rack		CBY-52212	FT-226-A	MT-71/ARC-5
Two-Transmitter Rack Mount		CBY-52213	FT-227-A	MT-70/ARC-5
Audio Jack Box				J-22/ARC-5
Audio Jack Box Mount				MT-78/ARC-5
Receiver Dynamotor		CBY-21531	DM-32-A	DY-2A/ARR-2
Transmitter Dynamotor		CBY-21626	DM-33-A	DY-8/ARC-5
Receiver Remote Tuning Shaft		A.R.C. 6151	MC-215-A	A.R.C. 6151
Tuning Shaft Right Angle		A.R.C. 6357	MC-211-A	MX-22/ARR-2
Homing Adapter	234 - 258	ZB-series	R-1/ARR-1	R-1/ARR-1
Homing Receiver	234 - 258			R-4A/ARR-2

(1) Also a component of the Navy's earlier RAV aircraft receiver system.

Audio frequency receiver output and modulator sidetone impedance for the ARA/ATA and the AN/ARC-5 is 300 to 600 ohms. In the SCR-274-N, "A" version receiver and modulator impedance is 4000 to 8000 ohms, while "B" version units have a 300 to 600 ohm tap on the AF transformers which can be connected.

ARA/ATA units and equivalent SCR-274-N units are interchangeable between systems, aside from audio impedance differences. However, AN/ARC-5 units generally are not interchangeable with the units of the earlier systems.

In contrast to ARA and SCR-274-N receivers, all AN/ARC-5 receivers have automatic volume control and a modified tube complement. The AN/ARC-5 navigation receivers have terminals and a switch to connect a DU-series direction finding loop to the receiver, and have a special audio line for an MX-19/ARC-5 adapter to allow the receiver to serve as an LF/MF localizer for the Navy's short-lived AN/ARN-9 Air-Track (related to ZA, ZAX) instrument landing system. These two capabilities were rarely if ever utilized. Otherwise, equivalent receivers of all three systems can interchange as a unit.

Few transmitter components of the AN/ARC-5 are interchangeable with ATA or SCR-274-N equivalent units. Mechanically, the transmitter rear power connector is slightly different, so inserting the wrong transmitter in a rack can damage either the rack or the transmitter power connector. Electrically, AN/ARC-5 transmitters use high-level final amplifier plate modulation, and the output tank circuit is shunt high voltage fed. The two earlier systems use less effective screen modulation, and the output circuit is series high voltage fed. The only electrical components of the AN/ARC-5 transmitter system that are interchangeable with the earlier systems are the dynamotor and the antenna relay.

Unlike earlier systems, none of the AN/ARC-5 control boxes have audio jacks for the microphone, headphone, or key. A separate jack box is used instead. AN/ARC-5 transmitter control boxes contain no Morse key.

The broadcast band receiver in all of these command sets is intended to host a homing adapter for the Navy ZB/YE homing system. The homing adapter demodulates a signal near 246 MHz that is modulated with a broadcast band carrier. The output is sent to the broadcast band receiver tuned to the modulating frequency to further demodulate the carrier for voice messages or for a Morse code letter indicating to the pilot his bearing from the homing transmitter. All broadcast band receivers came with a power adapter to supply power to the homing adapter. The adapter under the Navy nomenclature system is the ZB-series. The identical unit under JAN nomenclature is the AN/ARR-1. This system was used by both the Navy extensively and the Army much less so. To put the system into operation on the aircraft, the beacon band receiver would be replaced in the rack by the broadcast band receiver. The antenna post is connected to the output of the homing adapter, and a power cable is connected from the homing adapter to the broadcast band receiver. The normal control that had been used for the beacon band receiver also serves this homing system without further reconfiguration.

Western Electric developed the AN/ARR-2, an all-in-one homing receiver that replaced the broadcast band receiver and external homing adapter and had other enhancements as well. The R-4A/ARR-2 uses the same dynamotor as the AN/ARC-5 sets, fits in the same racks, and can be controlled by special AN/ARC-5 control boxes. The AN/ARR-2 replaced the earlier R-24/ARC-5 and R-1/ARR-1 combo in AN/ARC-5 installations.

Western Electric developed a four-channel crystal-controlled VHF-AM receiver and transmitter for the U.S. Army's SCR-274-N system. The Army did not adopt these VHF components and continued use of the Bendix SCR-522 VHF-AM set until the arrival of the AN/ARC-3. The Navy adopted modified versions of the Western Electric units as the R-28 receiver and T-23 transmitter. The T-126/ARC-5 is a late variant of the T-23 which allows the four channels to be grouped lower in a 100 to 146 MHz tuning range than does the T-23.

A typical installation of ARA/ATA or SCR-274-N sets would consist of a 3.0 to 6.0 MHz, a .19 to .55 MHz, and a 6.0 to 9.1 MHz receiver in a three-unit rack. Any two transmitters covering the desired frequency ranges would be in the transmitter rack. The two transmitters would be fixed-tuned before take-off, with the pilot able to select the desired transmitter and control the mode (Voice, MCW, CW) at the transmitter control box. The receivers were tuned at the pilot's control box by electrical cables and long mechanical tuning shafts, allowing remote control of power, mode, frequency, and volume.

AN/ARC-5 set composition and control differed markedly from the earlier systems. Three-unit receiver racks were still predominant, but the receiver line-up was quite different. One receiver would usually be a R-4A homing receiver, another the VHF R-28, and the last an MF/HF communication receiver. The transmitter rack would hold a VHF T-23 and an MF/HF transmitter corresponding to the MF/HF receiver. AN/ARC-5 communications receivers usually have a yellow circle-S stamped on the front panel to indicate that the receiver is a frequency-stabilized version. Such receivers were not remotely tuned by the pilot, but were instead lock-tuned to the associated transmitter's frequency before take-off. AN/ARC-5 navigation receivers are not so stabilized, and if installed in the rack a control that allows remote tuning is required.

Because of these characteristics, AN/ARC-5 close equivalents to the control boxes of the ARA/ATA and SCR-274-N are rare or never existed. The most common AN/ARC-5 receiver remote control box is the C-38/ARC-5, which allows control only of audio volume of the VHF and MF/HF receivers. No power, mode, or frequency controls are present. The C-38 also has controls for the R-4A homing receiver. A common AN/ARC-5 transmitter control box C-30A/ARC-5 has controls for selecting the MF/HF transmitter or the VHF transmitter, and a switch to select the channel for both the VHF transmitter and receiver. Mode controls are normally set for voice and covered.

The typical AN/ARC-5 three-receiver, two-transmitter installation reflects system capabilities that are quite sophisticated compared to the earlier systems, allowing VHF homing, four channel VHF-AM communications, and one channel MF/HF-AM communications. All unnecessary controls have been eliminated to simplify operation of this more capable system.

Aircraft Radio Corporation, along with Stromberg-Carlson, made most AN/ARC-5 units except for the Western Electric VHF units.

The AN/ARC-5 (along with the AN/ARR-2) is the ultimate development of the pre-war MF/HF command set. During and after WWII, the Navy proceeded to use VHF-AM for command functions with the AN/ARC-1 ten-channel VHF-AM set, and by the late 1940s progressed to the currently-used UHF-AM military aircraft band with the AN/ARC-12 (UHF version of the AN/ARC-1) and AN/ARC-27 sets. But the AN/ARR-2 continued into service well into the 1950s, and the beacon band R-23A/ARC-5 receiver was still to be found in some older US Navy aircraft as late as the 1970s.

LF/MF/HF receivers all use a similar same 6-tube superhet design: r.f. amplifier (12SK7), converter (12K8), two i.f. stages (two 12SK7's, or 12SK7/12SF7), diode detector/BFO (12SR7), and one audio stage (12A6). Transmitters use four tubes: 1626 oscillator, two 1625 finals, and 1629 magic-eye tuning. The latter gives a visual indication, viewable by raising a small cover, when the oscillator's frequency matches that of an internal crystal, thus allowing a check of the dial calibration. ^[3]

[edit] Gallery

SCR-274-N: Receivers BC-454-B, BC-453-B, BC-455-B in Rack FT-220-A.	SCR-274-N: Transmitters BC-457-A, BC-459-A in Rack FT-226-A.	SCR-274-N: Receiver Control BC-450-A, Transmitter Control BC-451-A, Modulator BC-456-B, Antenna Relay BC-442-A.	SCR-274-N and AN/ARR-1: Broadcast Band Receiver BC-946-B, Homing Adapter R-1/ARR-1.
AN/ARC-5 and AN/ARR-2: Homing Receiver R-4A/ARR-2, HF Receiver R-26/ARC-5, VHF Receiver R-28/ARC-5 in Rack MT-65/ARC-5.	AN/ARC-5: VHF Transmitter T-23/ARC-5, HF Transmitter T-20/ARC-5 in Rack MT-71/ARC-5.	AN/ARC-5 and AN/ARR-2: Receiver Control C-38/ARC-5, Transmitter Control C-30A/ARC-5, Audio Jack Box J-22/ARC-5, Modulator MD-7/ARC-5, Antenna Relay RE-2/ARC-5, DC Power Filter F-5/AR.	AN/ARC-5: Single Tunable Receiver Control C-26/ARC-5, Beacon Band Receiver R-23A/ARC-5 with ILS Adapter MX-19/ARC-5, Broadcast Band Receiver R-24/ARC-5 with Local Control C-24/ARC-5, Local Control Shorting Plug MX-2/ARR-2.