US Navy HF Transceivers & Transmitter-Receivers

Shipboard HF/MF/LF Transmitters

VHF and UHF Transmitters and Transceivers

WW2 Transmitters and Transceivers

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Made by RCA
Manual NAVSHIPS 91235

2-12 mc AM/CW  
10 crystal controlled channels 
15-20 watts output


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grc13-51.jpg (254824 bytes) C-477/GRC-13 control unit
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NT-26026 key for GRC-13
Legband NT-10531
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Mic for GRC-13 NT-51071
Headset NT-49507-A
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FR-20/U wavemeter for GRC-13
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Crystal pack for GRC-13 NT-10527-A
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PU-158/U Engine- Generator
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part of AN/MRC-55 Jeep

2-20mc 400W, AM/CW/FSK
made by ITT Federal
Technical Description

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R-808/GRC-14 receiver

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AN/SRC-16 Transceiver System (4 rcvr-xmtr units)

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AN/SRC-16 Specifications (from 1964 Collins catalog)

 AN/SRC-16 Checkout/Maintenance Manual 
      - thanks to Francesco K5URG

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SRC-16 Communications Central Control aboard DLG-33
photo thanks to W5JV
modern "Communications Central"

4 independent rcvr-xmtr channels
2-30mc, SSB/CW/NTDS, 500w PEP per channel (plus two 5KW amps)


The AN/SRC-16 is a high capacity, long range HF communication system which provides four independent transmit and four independent receive channels. The system includes two 5 kw linear amplifiers which can be switched into any two transmit channels in lieu of the 500 watt amplifiers normally used. Frequency coverage is in 1 kc tuning increments over the 2.0-29.999 me range. Operating mode choice includes AM, CW, MCW, FSK, SSB, ISB and data communication on each channel. The channel frequency of each transmitter and receiver is phase locked to a primary frequency standard assuring high signal stability.
  • CIRCUIT FEATURES - Linear power amplifiers, high performance filters and low distortion circuitry meet all complex data transmission and reception performance requirements. Compatible AM is transmitted using the upper sideband and a reinserted carrier. Pi network output circuitry assures efficient antenna loading. The converter for FSK-CW mode reception includes an oscilloscope to monitor test tones and to facilitate BFO adjustment on FSK reception.
  • RF LEVEL CONTROL - A variable attenuator, using transistor circuitry, provides automatic control of radiated or received power levels. The RF signal between the transmitter and RF amplifier can be attenuated up to 120 db. Normally, it is automatically controlled by direct current pulses. It can be switched to the receiver input to manually attenuate the RF signal level.
  • ANTENNA SWITCHING - The AN/SRC-16 employs 12 automatic antenna couplers with terminations for three or more antennas. In a typical installation, eight couplers are associated with the 2-6 me antenna, two couplers with the 5-15 me antenna and two with the 10-30 me antenna. Other arrangements are optionally available to meet individual system requirements. An RF switching matrix located in the HF coupler cabinet connects individual channel equipment to the proper antenna couplers. The couplers permit duplex operation on all channels by isolating transmit and receive circuitry, as well as maintaining the correct antenna impedance match. External equipments, such as the AN/URC-32, AN/WRT-2, AN/SRT-14 and AN /SRT-15, can also be connected to the antenna matrix through auxiliary input jacks.
  • INPUT PATCHING - A communication patching switchboard permits connecting remote input audio lines to any of the radio channels. Interlocked pushbutton selectors prevent improper operation, and visual or aural signals indicate equipment status. Voice compression and noise squelching facilitate voice communications. Redundant power supplies prevent central control failure in the event of a single power supply malfunction.
  • SYSTEM TEST FACILITIES - An integral multipurpose test set simplifies system maintenance tests. A two-tone signal can be applied to either transmitted sideband for distortion measurements and check of performance quality. A sidetone containing the signal is sampled at the T /R relay, coupled to the receiver input, demodulated and passed to a distortion measuring circuit which analyzes the hum level at 400 cps and 800 cps, third order distortion products and the second harmonic of the F1 tone. Frequency lock is tested by transmitting one of two tones on both LSB and USB in a closed loop throughout the system.
  • UNITIZED CONSTRUCTION - The entire system is housed in eight separate equipment cabinets. Maintenance and installation are simplified through the use of modular construction. Individual units are mounted on slide cabinet drawers and all electrical connections are made through mating connectors wherever possible. Additionally, the system can be easily expanded as traffic increases by adding units and cabinets. Completely automatic tuning allows the control cabinet to be located up to 900 feet from the other seven cabinets of the installation. It contains facilities for switching of remote input stations, system fault alarm, digital frequency selection, standby-operate control, manual variable RF level attenuation, audio level metering, RF output metering, signal monitoring, with controls and indicators for all modes.
  • COOLING - Each cabinet is water cooled by a closed-cycle cooling system. The inlet of the centrifugal blower is attached to a water cooled heat exchanger and supplies air to a plenum located at the rear or center of the cabinet. This plenum supplies cooling air to all the units in the cabinet through openings in the rear or bottom of the units. When a unit is withdrawn from the cabinet, the plenum opening is closed by a sliding valve.

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The AN/SRC-23(V) is a single channel HF transmitter-receiver communications system which operates in the 2-30 MHz range. The transmitter-receiver is automatically tuned and capable of local or remote control in either simplex or duplex modes of operation for AM, CW, USB, LSB, ISB, AFTS, voice, or data. The equipment has a 1 KW power output; however, an alternate 5 KW RF power output may be obtained using a 5 KW linear power amplifier. 

Designed especially for shipboard installations, this transmitter-receiver group may also be used for shore-base installations and consists of eight basic units located within a cabinet. 

  • The front panel of the transmitter control unit provides the controls for manually selecting the modes of operation for the transmitter and amplifier group.
  • The receiver control unit provides controls for operating the receiver.
  • The frequency selector control unit provides the selector switches for selecting the desired operating frequency for the transmitter and receiver units.
  • The radiofrequency amplifier unit receives the signal from the transmitter and amplifies it to 1,000 watts.
  • The frequency standard unit is optional equipment, which may be installed in the cabinet when external frequency standard equipment is not supplied. It provides an unmodulated 100-kHz output frequency used for calibrating the radio transmitter and receiver. In case of power failure, an internal 28 VDC battery in this unit will automatically supply power for two hours.
  • The electrical equipment cabinet provides mounting space for all of the functional units and other equipment, such as a heat exchanger and blower for cooling the system, patch terminal strips, thermal alarm indicators, a warning panel, primary power circuit breaker, and interconnection system components.

The equipment is completely transistorized except for the use of two electron tubes. A frequency-synthesizer provides transmitter-receiver frequencies separated at 500 hertz intervals across the band. The AN/SRC-23(V) is a single-channel version of the four-channel service test NTDS (Naval Tactical Data System) AN/SRC-l6

AN/URC-7 transmitter-receiver

urc7-uscg-01.JPG (380475 bytes) The AN/URC-7 is an amplitude-modulated transmitter-receiver for short-distance radio-telephone communication. Both transmitter and receiver have six pretuned crystal-controlled channels in the frequency range 2000 to 7000 kc. The transmitter has an output power of 25 watts. The transmitter, receiver, and the modulator-power supply are contained in a single cabinet..
    The AN/URC-7 is used principally in service craft and auxiliary-type ships, such as tugs, transports, tankers, and ships of the amphibious force.

Spec sheets


Click here for photos and more info

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Prototypes only - intended as replacement for TCS

2-20 mc, AM-CW, 42w output

16 present frequencies
PTO or xtal control (4 xtals)

Click here for photos and more info - thanks to K4OZY

AN/URC-8 (XN-2)

CBS Labs prototype 1955 Need info! -


Photos, info and manual downloads

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HF SSB transceiver
2-30mc, CW/SSB, 500w

Collins KWT-6 family

Photos, info and manual downloads

AN/URC-34 (115vac)
AN/URC-34X (115vdc)
USCG only?
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6 channel HF AM transceiver (2-9 mc)

RT-452/URC Transmitter-Receiver
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3 x 6146 final, 2x 6146 modulators

RT-452/URC Transmitter-Receiver
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RT-452/URC Transmitter-Receiver
C-2521/URC remote control
MD-336/URC-34 modulator & p/s
(MD-337 for AN/URC-34X)

Manual NAVSHIPS 93349

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AN/URC-35 Transceiver

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modern HF SSB transceiver
2-30 mc, 100w

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RT-618/URC transceiver
AM-3007/URC amplifier
C-9044/URC-35 remote control
used with CU-937/UR antenna coupler

1967 Introduction

predecessor - General Dynamics SC-series


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C-9044/URC-35 remote control
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(RF Communications RF-301)
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Download manual
(NAVSHIPS 0967-034-8000_

RT-790/URC-58 Rcvr-Xmtr
MT-3504/URC-58 mount

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(Harris RF-280)

1978 Mil Spec MIL-R-28848 


(V) 1 shock mount
(V) 2 rack mount

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RF-280A and URC-94(V)1 
- thanks to KA3EKH

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C-10206/URC-94 control
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J-3641/URC-94 junction box
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AN/URC-109 (Marconi ICS4)

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Harris "Pacer Bounce" RF-350 series

My Restoration Project

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RT-1446/URC 100w transceiver
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AM-7224/URC 1 kw linear amp
PP-7913/URC power supply

AN/URA-38C antenna coupler

C-11329/URC remote control

HFRG Transceiver

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High Frequency Radio Group (HFRG) is a fully automated subsystem of the external radio communications system (RCS) aboard surface ships. The HFRG operates in the Very Low Frequency (VLF), Low Frequency (LF), Medium Frequency (MF) and High Frequency (HF) bands and supports full duplex, half duplex and simplex operation for tactical and long-haul voice, interrupted continuous-wave, teletype and digital data communications in the Lower Sideband (LSB), Upper Sideband (USB), Independent Sideband (ISB), Amplitude Modulation Equivalent (AME) and Link 11 modes of operation. The HFRG consists of three subsystems: the Transmit Subsystem, the Receive Subsystem and the Control/Monitor Subsystem (CMS).
Transmit Subsystem: The Transmit Subsystem operates (in increments of 10 Hz) in the frequency range of 2 Mhz to 30 Mhz and is used primarily for broadband circuits. The Transmit subsystem is designed to allow all exciters to operate in the Link 11 mode, but contains the assets required to support two (2) 1kW narrowband circuits which are the primary HF Link 11 circuits. The operational capabilities of the transmit subsystem require both broadband and narrowband antennas. The operational configuration of the transmit subsystem is accomplished in response to commands from the CMS and frequency changes (except narrowband) are completed in less than 100 milliseconds. The transmit subsystem reports to the CMS when the system is configured and also reports detected failures.
Receive Subsystem: The Receive Subsystem operates (in increments of 10 Hz) in the frequency range of 14 Khz to 1.619 Mhz and 2 Mhz to 30 Mhz. The receive subsystem requires at least two broadband antennas and 1 or 2 additional antennas dedicated to the use of the Ship Signal Exploitation Equipment (SSEE). The operational configuration of the receive subsystem is accomplished in response to commands from the CMS and frequency changes are completed in less than 20 milliseconds. The receive subsystem reports to the CMS when the system is configured and also reports detected failures.
Control/Monitor Subsystem (CMS) The Control/Monitor Subsystem is the backup point of control for the HFRG when the system is being controlled by the Surface Ship Automated Communications Control System (SSACCS) (part of the Communications Support System (CSS)). The SSACCS normally controls the HFRG through an interface with the CMS, but if the SSACCS becomes inoperable the CMS automatically assumes the functions of remote control, performance monitoring, test, operator interface, and display of the operational characteristics. The CMS is used to send configuration commands to the transmit and receive subsystems and, in turn, receive configuration completion and operational characteristics from these subsystems.

From "Jane's Military Communications"- The AN/ URC-131(V) High Frequency Radio Group (HFRG) system is an integrated, solid-state naval communications suite, designed to provide a balance between transmitter and receiver performance in a co-located shipboard environment. The three main communications components of the AN/URC-131 (V) are the Broadband Transmit Group (BTG), the Narrowband Transmit Group (NTG) and the receive system. The third-generation BTG is of solid-state design and provides coverage of the 2 to 30 MHz band. Three BTG variants have been produced - a 4 kW (8 circuit) system, an 8 kW (17 circuit) system and a 12 kW (26 circuit) system. All three systems use only two topside broadband antennas. The NTG consists of up to three solid-state 1 kW transmitters with power post-selectors and digital antenna couplers. The NTG can be tuned in the presence of adjacent antenna interference and offers completely silent tuning. It has a rapid-tune digital antenna coupler. It can also serve as a stand-alone system aboard small ship platforms. The receive system's R- 2557A/URC receiver operates over the full LF, MF and HF frequency range from 10 kHz to 30 MHz. Other features include: up to 49 receive circuits; passive antennas, which require no electronics topside; and an atmospheric noise-limited design. The HFRG's HFRG Remote Control/ Monitor Subsystem (RCMS) is designed for 'lights out' operation in the transmitter and receiver compartments. Its features include: a ruggedized, PC workstation with full ASCII keyboard and pointer for function selection/ activation; redundant control buses and subsystem controllers for system survivability.

Digital Modular Radio (DMR)


General Dynamics


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AN/WRA-1 SSB Transceiver

RT-645/WRA-1 SSB Transceiver
CN-513/WRA-1 Voltage Regulator
CU-701/WRA-1 Line Coupler

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CN-513 is a regulated screen supply for TBL

CU-701 is a buffer amp to drive TBL

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1963 AN/WRC-1 article

AN/WRC-1 procurement

AN/WRC-1B and CU-937/UR Manual
NAVSHIPS 0967-LP-427-5010
 - download 40MB pdf

ET A School HF Transmitter/Receiver Sub-Systems (1982)   - covers AN/WRC-1B and AN/URT-23(V)
Vol 3 part 1 - exercises - download pdf
Vol 3 part 2 - diagrams - download pdf

modern HF SSB transceiver
2-30mc, 100w

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R-1051/URR receiver
T-827/URT exciter
AM-3007/UR power amplifier
CU-937/UR antenna coupler
J-1265/U junction box

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T-827B/URT exciter

predecessor equipment- General Dynamics SC-series

Eldico S-100 SSB transmitter-receiver

1959 spec sheet
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4-channel , 2.2-30 mc SSB

R-100 receiver
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R-100 receiver
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A small number were installed for interim testing before military SSB equipment was procured.

R-100 receiver
T-100 transmitter
M-100 Antenna Tuner
M-102 DC supply remote control

Used with SRA-25 antenna tuner

T-100 Transmitter
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T-100 Transmitter
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T-100 Transmitter
(photos thanks to Brian WA5UEK)
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RCA SSB-1 Transceiver

More SSB-1 photos and info 

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RCA SSB HF transceiver 60 watts
4-channel, crystal controlled 3-15 mc
pair of 6146 output (3x 6146 in later models)

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Commercial unit used extensively by USN before military SSB equipment was procured



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SSB-1 block diagram

used with AN/SRA-20 antenna tuner

More SSB-1 photos and info