Navy Receiver Accessories -
AF Switchboard, Jack Panel, Audio Amp, & Loudspeaker

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Shipboard Receiver & Transmitter Switchboard Interconnections

RECEIVER RF PATCH PANELS - See Receiving RF Patch Panels & Switches



Also see Receiver Site AF/RF Signal Distribution Units

NT-49063 Audio Jack for receiver operating positions

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NT-491394 Audio Jack Panel
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Two rows of 13-pairs, 2-conductor
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C-443/G AF Control and Jack Box - installed at receiver operating position
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C-443/G schematic  

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J-939B/U Audio Jack Box - typically installed at receiver operating position


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SB-470/FG Comm station audio patch panel
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Guam - patch panel
Patchboards at NAVCOMMSTA Guam - Note AN/FCC-3 multiplexer in Rack #14 and TH-39/UGT keyer in Rack #15

Older-style audio patch panels always used dual 2-conductor patch cords - with signal on each tip and shield on the sleeves.
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Also see Receiver Site AF/RF Signal Distribution Units

Newer-style audio patch panels used 3-conductor patch cords, with signal lines on tip and ring, and shield on sleeve. If the transmit-and-receive side of a communications circuit is wired to adjacent jack fields, a dual patch-cord assembly may be used to patch both sides of the circuit simultaneously.

SB-3092/U audio patch panel
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These are 3-conductor jacks - signal lines are on tip and ring, shield on sleeve.
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COMMUNICATIONS PATCH PANEL, SB-3092A/U - This is an audio circuit communications patch panel. It has three rows of 26 jacks, each mounted on an open frame suitable for installation on a 19-inch rack. Connections to the panel are facilitated by a terminal block mounted at the rear of the frame (missing in photos above)
    The three rows of jacks are labeled monitor (MON), LINE, and equipment (EQUIP). The MON jacks are wired parallel to the LINE jacks. The LINE jacks are wired directly to the audio source, and the EQUIP jacks are wired to the load or equipment using the audio signal. Under normal conditions, with no patch cords inserted into a jack field, the audio source is wired directly through the audio load. When a patch cord is inserted into a LINE jack, the audio source is removed from the load connected to the EQUIP jack located directly below the LINE jack, and the source now appears at the other end of the patch cord. When this end of the cord is inserted into an EQUIP jack, the audio source appearing on the LINE jack directly above the EQUIP jack is removed from the load, and an alternate circuit has been completed between the two ends of the patch cord. The MON jacks allow the operator to test an audio circuit without disturbing signal flow by inserting a patch cord between the appropriate MON jack and another jack connected to the input of the desired piece of test equipment. The patch panel can accommodate up to 26 audio circuits. If the transmit-and-receive side of a communications circuit is wired to adjacent jack fields, a dual patch-cord assembly may be used to patch both sides of the circuit simultaneously.

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24" patch cord with
NT-491242 plugs
What numbers for other lengths?  manuf CN-491242 
manuf CN-491397
National Electric Machine

AF Level Meters

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AF level meter + amp & speaker
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transistorized - note - schematic is printed on bottom cover

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AF level meter

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octal tubes - note - schematic is inside unit

Manual for TS-629A/U

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AF switching
10 remotes, 5 receivers
(10 outputs, 5 inputs)

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  Spec Sheet - thanks to HNSA

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    Receiver transfer switchboard, type SB-82/SRR, is shown above. The receiver switchboard has five vertical rows of ten single-throw (ON-OFF) switches that are continuously rotatable in either direction. One side of each switch within a vertical row is wired in parallel with the same sides of the other nine switches within the row. Similarly, the other side of each switch is wired in parallel horizontally with the corresponding sides of each of the other four switches in a horizontal row. This method of connecting the switches permits a high degree of flexibility.
    In general, there are more remote stations than radio receivers, hence the audio outputs five receivers are fed to the five vertical rows and ten remote stations are connected the ten horizontal rows. With this arrangement, a selected receiver output is connected to any or all of the remote stations by closing the proper switch(es). When one switchboard is inadequate for accommodating all of : receivers and remote stations installed in ship, several of these switchboards are mounted together and interconnected so that they form a bank of switchboards. 
    The knob of each switch is marked with heavy white line to provide visual indication of whether the switch is in the ON or OFF position Switchboards always are installed with the line positioned vertically when the switch is open (off). To further standardize all installations, receivers usually are connected to the vertical rows of switches, and remote stations are connected to the horizontal rows. Identification of the receivers and remote stations is engraved on the laminated bakelite label strips fastened along the top and left edges of the panel front.
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SB-973/SRR aboard DLG-30
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SB-973/SRR - AF switching - 10 remotes, 5 receivers
   A more recent model receiver transfer switchboard is the SB-973/SRR, illustrated above. This switchboard contains 10 seven position rotary selector switches. Each switch or operating knob relates to a remote control station Switch positions one through five relate to receivers.
    Position X on each switch serves to transfer the remote control stations connected to the original switchboard to the corresponding switches in additional switchboards. In this manner, any number of receivers can be connected to the ten remote control stations. An additional switchboard is needed for each five additional receivers.
    Switchboards providing facilities for additional remote control stations are mounted in vertical sequence, whereas those containing additional receivers are mounted in horizontal sequence.
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AF switching
20 remotes, 24 receivers

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 download pdf manual

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audio amp

5 inputs, 10 watts output

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photo thanks to Dave Guggenheim

AM-215 Info Page - Photos and Spec Sheets for all models

The AM-215( )/U is an audio amplifier unit that amplifies low-level audio signals for reproduction through loudspeakers. As many as five radio receivers and five loudspeakers can be connected to this unit, but only one signal is amplified and reproduced at any one time. The signal to be amplified and reproduced is selected by means of a channel selector switch located on the front of the amplifier unit. Other controls on the unit's front panel are a volume control, a power on-off switch, and a power-on indicating lamp.

AM-215B/U, AM-215C/U, AM-215D/U manual - NAVSHIPS 91626 pdf

audio amp & compressor

Adjustment procedure and info

AM-413/G manual download

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  Harmon-Kardon AM-413/G
  Amer. Measuring Instrument - AM-413A/G


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AM-3729/SR audio amp
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transistorized replacement for AM-215/U - Manual

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Speaker-Amp - Specs
5 input, 10 watt, transistorized

Photos and manual thanks to Daniel K6YIC


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audio amp
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audio amp & compressor
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Amplifier Group
5 channel compressor

AM-1910/G amplifiers
PP-2310/G power supply

Adjustment procedure and info

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Manuf Melcor


Please send me email if you have a manual I can borrow/buy

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RMHP 22C-102
5 channel audio attenuator
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shipyard built item
aboard USS Midway
-- --

Communications Loudspeakers & Amplifier-Loudspeakers

AM-2631/U Amplifier-Loudspeaker

general purpose speaker with built-in audio amp. Five input channels, 5 watts.
Replacement for NT-49545


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Rack mount twin speaker
used in Comm Stations

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Version without phone jacks
Manuf Westlab & others
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Version with phone jacks
manuf Airplane & Marine Instruments
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Another version 
(DSA, not USN - manuf Adek)
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Another version (not USN)
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manual download (includes AM-413/G)

 A single-speaker version of the LS-139/G ls169g-01.jpg (126939 bytes) ls169g-02.jpg (96929 bytes)

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   A general-purpose communication loudspeaker is the LS-195/U. Like the NT-49546, this unit is used mainly for monitoring voice channels. Unlike the NT-49546, however, the unit cannot withstand prolonged exposure to the weather; it is designed for installation in protected areas only. In addition, it has a front panel volume control and is transportable, whereas the NT-49546 has a preset, covered volume control and is mounted permanently.

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LS-199/U (for AN/URR-23A)
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ls199-1412-02.jpg (163572 bytes) LS-228/U (for AN/URR-39)
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LS-474/U + AM-3729/SR amplifier aboard USS Midway

CMX-49131 amplifier-loudspeaker
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Information - specs

Schematic & Parts List

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Manuf Magnavox

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CMX-49155 (for TBS)
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CMX-49545 amplifier-loudspeaker

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    The Navy type 49545 amplifier-speaker unit is a combination audio amplifier and loudspeaker assembly. Its reproduction qualities are considered good. Aboard most ships, it is installed in berthing and messing compartments as an entertainment loudspeaker.
    All operating controls of the unit are located on the front panel. They consist of a power on-off switch, a power-on indicating lamp, a tone control, a volume control, and a channel selector switch that permits selection of up to five different entertainment (or communication) channels.

Manual NAVSHIPS 900,853 download

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NT-49546 Loudspeaker


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cul45946-12.jpg (24098 bytes) general radio use
manuf CUL University
manuf Tabet
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Although it is a general-purpose communication loudspeaker, the NT-49546 is used principally for reproducing voice transmissions. The unit can be connected directly to a radio receiver, or it can be operated through an audio amplifier unit, such as the AM/215( )/U. Best results are obtained with the audio amplifier unit. The loudspeaker, designed as a watertight and shockproof unit for installation in exposed areas, also is used extensively in such spaces as the pilothouse and CIC. It usually is mounted on the bulkhead above or near its controlling amplifier unit.

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manuf CZY Allied Radio

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CZC-49587 (used with RCH)

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CMX-49620  amp/speaker
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Amp & 8" Speaker

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manuf CMX Magnavox-

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General Purpose & PA loudspeakers (Interior Communications)

AM-2320A/WIC amplifier-loudspeaker
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70v line input. Transformer taps give up to -24dB attenuation
ls305-sic-03.jpg (6483 bytes) manuf Tabet, Dynalec

Download spec sheet

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70v line
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70v line input
ls530-sic-52.JPG (42589 bytes) manuf Telectro Systems
ls543-sic-01.jpg (19720 bytes)
ls543-sic-02.jpg (21862 bytes) - manuf University
RCA MI-2915-FA
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spkr-MI-2915-FA-02.jpg (18711 bytes) spkr-MI-2915-FA-03.jpg (9912 bytes) manuf RCA
RCA MI-2917-J
spkr-mi2917j-01.jpg (52938 bytes)
spkr-mi2917j-02.jpg (52033 bytes) spkr-mi2917j-03.jpg (55347 bytes) manuf RCA
RCA 2917-S
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spkr-74404-1207-04.jpg (166089 bytes) spkr-74404-1207-05.jpg (367389 bytes) manuf RCA
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RCA MI-2961
MI-2961-01.jpg (20551 bytes)
MI-2961-02.jpg (16414 bytes) - manuf RCA
Jensen NA-10001
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VRS-1 recording equipment
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Speakers for use with Underwater Sound Equipment

LS-185/U for AN/SQS-1 Sonar
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ls185-1804-02.jpg (40667 bytes) ls185-1804-03.jpg (32048 bytes) manuf Dumont ==
CRV-49145 for NMC equipment
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CBM-49225 for NMC-1 equipment
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CJS-49235 for QJB Sonar
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