REMOTE CONTROL SYSTEM EQUIPMENT SUMMARY LISTINGS
The equipment is listed in the identical order to that of the source material.
Model	Description	Comments
AN/URA-501 consisting of:	Remote Control System
RCU1/C 5120	Remote Control Unit	Single channel unit. No cover. Stock #5820-21-402-2002
RCU1A/C 5120A	Remote Control Unit	Single channel unit with watertight cover. Stock #5820-21-402-2006
RCU4/C 5121	Remote Control Unit	Four channel unit. Can select up to 4 radio systems. No cover. Stock #5820-21-402-2003. See Featured Equipment section.
RCU4A/C 5121A	Remote Control Unit	Four channel unit. Can select up to 4 radio systems with watertight cover. Stock #5820-21-402-2007
RSU/SB 5055	Receiver Switching Unit	Stock # 5820-21-402-2005.  See Featured Equipment section.
CSU	Channel Switching Unit	Supports up to 10 RCU's and 5 CAU's. A row of red and green lamps indicate receive/standby or transmit status of each of the 5 radio channels. Stock #5820-21-402-2004
CAU/AM-5143	Channel Amplifier Unit	Vacuum tube version. Stock #5820-21-400-2004
CAU/AM-5143	Channel Amplifier Unit	Solid state conversion with speech compression feature. Stock #5820-21-400-2004
AN/SRA-504 consisting of:	Remote Control System
AM 5224	Amplifier Power Supply	See Featured Equipment section.
SB 5086/SRA-504	Audio Patch Panel	See Featured Equipment section and SRA-504 system description.
C 5205/SRA-504	Control Indicator	See Featured Equipment section.
C 5206/SRD-504	Control Indicator	For AOR Class.  (Image courtesy RCN)
C 5207	Control Radio Set	See Featured Equipment section and SRA-504 system description.
OJ 5002/SRA-504	Remote Operate Console	See Featured Equipment section and SRA-504 system description.
C 5208	Control PS	See SRA-504 system description.
MX 5128	MF Adapter	Same function as HF adapter.
MX 5129	HF Adapter	See SRA-504 system description.
MX 5130	VHF Adapter	See SRA-504 system description.
MX 5131/SRA-504	Adapter Control To Intercom	See Featured Equipment section.
J 5091	Jackbox	See SRA-504 system description.
PP 5200	Power Supply	See SRA-504 system description.
AM 5233	Audio Amplifier	See SRA-504 system description.
SAC	Switch Assembly Converter	See Featured Equipment section.

C 5205/SRA-504
Control indicator for DDH 280 designed to accept 20 transmit/receive circuits and provide a ready/busy status indicator for the TX section of these circuits. In addition, any of the 10 circuits can be allocated to the 10 channels of the Control Radio Set. It also allows any one of the 20 transmit/receive circuits to be switched into any of the 5 monitoring positions.

C 5206/SRA-504
Control indicator for the AOR is designed to accept 10 transmit/receive circuits and provide a ready/busy indicator. In addition any of the 10 circuits can be allocated to the monitoring position.

SA 5042/SRA-504
Matrix signal routing switch providing the capability of connecting 10 six level inputs to any of 10 six level outputs. (Not shown)

OG 5001/SRA-504
Amplifier Power Supply Group (APS) provides the following functions:
a) amplifies the received signal to drive the CRS.
b) while transmitting, provides a side tone for the CRS.
c) Presence of keyline voltages is detected and "Ready" indicators are energized.
d) Operation of a PTT switch or key connected to the circuit is detected and the associated transmitter is keyed as well as the "Busy" indicator is illuminated.

C 5207/SRA-504
Control Radio Set (CRS) permits the remote operator to obtain access to anyone of ten communications channels available from the associated matrix.

SB 5086/SRA-504
Switchboard patching Communications is where the audio and keylines from transmitters, receivers and adapters enter the Receiver/ Transmitter Control system and are allocated to various channel amplifier modules or in some cases (such as RATT and Link 11) to equipment outside the receiver/transmitter control system.

OJ 5002/SRA-504

Console consists of the following:
a) Up to 8 remote controls for AN/SRC 503/ WRC 501
b) Up to 6 TX/RX controls or AF/RF indicators for the AN/SRC 23
c) CCR monitor positions 1 and 2
d) Intercom System (AN/SIC503)
e) Control indicator (either C5205 or C5206)
f) Matrix switch assemblies (SA5042)
g) Control Power Supply (C5208)
h) Waste paper container
i) Jacks for headset/handset and CW keying
j) Automatic ship's telephone
k) Pull out shelf for typewriter.
l ) Two drawer filing cabinet

C5208/SRA-504
Control Power Supply contains main breaker, subsidiary switches, fuses and a fault alarm for the PP 5200

MX 5129/SRA-504
Adapter provides facilities for the conversion of the HF transmitter (AN/SRC 23) audio and keyline to the standards of the AN/SRA 504 system

MX 5130/SRA-504
Adapter provides for the conversion of VHF/ UHF transmitter and receiver (AN/SRC 509, AN/VRC 49, AN/SRC 503, AN/WRC 501) audio and keyline to the standards of the AN/ SRA 504 System

MX 5131/SRA-504
Adapter control intercom accepts the outputs of two CRS and the ships intercom system and combines them into a binaural headset (Intercom on left ear and selected CRS right ear)

J 5091/SRA 504
Jackbox provides facilities for connecting an operator in the CCR to the AN/SRA 504 system (three monitor position).

PP 5200/SRA-504
Power Supply provides DC power to operate the matrix and all the indicator lights in the control indicator. Control located in console but power supply in separate rack -not shown

AM 5233/SRA-504
Amplifier, audio frequency provides audio amplification of the maximum CRS output available from the handset/headset jacks to the level required for the landing Safety Officer console positions. (not  shown)

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FEATURED EQUIPMENT

CAU/AM-5143. This is the vacuum tube version of the CAU. In spite of a difference in capability offered by the speech compression feature in the solid state version of the CAU, they both bear the same designators and stock numbers. (Image courtesy Canadian Navy)

CAU/AM-5143 - Solid state version. The only difference between the vacuum and solid state versions of the CAU is the inclusion of the Compression In/Out switch just above the nameplate.  Otherwise, they are completely identical when viewed from the front. (Photo by Jerry Proc)

CAU/AM-5143. Top view of the solid state version. (Photo by Jerry Proc)

CSU.  Each unit in this array allows up to ten different Remote Control Units to be switched or shared between five different transmitter/receiver pairs. By moving a slide switch, any RCU could be connected to any available radio channel. Once a slide switch was set to a particular position, the RCU could only communicate with one particular transmitter/receiver pair. There can only be a maximum of 4 RCU's attached to one radio channel. (Image courtesy Canadian Navy)

In this 3 by 3 CSU installation aboard HMCS HAIDA, all the CSU's have been swung into the maintenance position. (Photo by Jerry Proc)

RCU1/C 5120. Single Channel RCU. (Photo by Jerry Proc)

RCU4/C 5121. With the selector switch, this RCU can connect the operator to four different radio channels. This unit does not have the telephone style handset installed. Morse keys could be hardwired to the RCU or plugged into the key jack.  (Photo by Jerry Proc)

RSU/SB 5055. A pair of Receiving Switching Units is picture here. This switching arrangement provides flexibility in the useage of LF/MF/HF receivers and provides a method of muting the receivers. Up to 6 receivers can be wired to the input of the RSU. Each receiver can then be switched to five different outputs. (Image courtesy Canadian Navy)

SAC. Used in conjunction with a two channel frequency shift converter to enable any two audio inputs from four receivers to be selected as inputs to the converter. No AN designator is assigned to this device.  (Image courtesy Canadian Navy )

Top: AM 5224/SRA-504 Amplifier Power Supply (APS). These audio amplifiers provide sufficient amplification for the maximum number of Control Radio Sets (CRS) be used in the system. Bottom: SB 5086/SRA 504 Audio Patch Panel. Provides interconnection between the receiver /transmitters and the teletype terminal equipment or the remote control system. (Image courtesy Canadian Navy)

C5205/SRA-504 Control Indicator. Provides a means of selecting up to 10 of the 20 circuits allocated at the SB5086 switchboard patching unit for use at the CRS and up to 5 of the 20 circuits for use at the monitor positions.  (Image courtesy Canadian Navy)

OJ 5002/SRA Remote Operate System Console. See SRA-504 system description for details. (Image courtesy Canadian Navy)

C5207/SRA-504 Control Radio Set. Provides for the selection of any 1 of 10 channels available at the CRS and a ready/busy indication for the selected channel. (Image courtesy Canadian Navy)

MX 5131/SRA-504 Adapter Control.  This adapter control intercom accepts the outputs of two CRS and the ships intercom system and combines them into a binaural (2 ear) headset. (Image courtesy Canadian Navy)

Contributors and Credits:

1) RCN's AOR/TRBL/ISL/265/IRE/MACK Class Equipment Handout. September 1985.
2) Tom Brent <tgb(at)telus.net>

Aug 05/08