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

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RECEIVER AF PATCH PANELS

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.

NT-491397
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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
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AF Level Meters

ID-1185/FRA
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AF level meter + amp & speaker
id1185-fra-07.JPG (84778 bytes) id1185-fra-09.JPG (99789 bytes) Used in COMMSTA AF/RF Signal Distribution Unit 

transistorized - note - schematic is printed on bottom cover

TS-629B/U
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AF level meter

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ts629-u-1212-03.JPG (43181 bytes) Used in COMMSTA AF/RF Signal Distribution Unit - barely visible at upper left of Guam photo above.

octal tubes - note - schematic is inside unit

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RECEIVER AF TRANSFER SWITCHBOARDS

SB-82/SRR
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AF switching
10 remotes, 5 receivers
(10 outputs, 5 inputs)

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3-47.jpg (84724 bytes) 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.
SB-973/SRR
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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.
SB-2727/SRR
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AF switching
20 remotes, 24 receivers

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sb2727-srr-54.jpg (53058 bytes) NAVSHIPS 0969-124-8010

 download pdf manual

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AUDIO AMPLIFIERS & LOUDSPEAKERS

AM-215/U
AM-215A/U
AM-215B/U
AM-215C/U
AM-215D/U
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

AM-413/G
AM-413A/G
audio amp & compressor

Adjustment procedure and info

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

am413-g-91.JPG (86157 bytes) am413-g-92.JPG (72570 bytes) Manuf - 
  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 -- --
AM-6222/U
AM-6223/U
audio amp

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AN/GSA-33
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

NAVSHIPS 93433

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
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Communications Loudspeakers

LS-139/G

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 procurement - manuf Adek)
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NAVSHIPS 93095

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LS-185/U for AN/SQS-1 Sonar
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LS-195/U
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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-474/U
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Manuf Fidelity Amplifier
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Red for classified circuits
Manuf Tabet
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LS-474/U + AM-3729/SR amplifier
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LS-474/U + AM-3729/SR amplifier aboard USS Midway
NT-49545
amp/speaker

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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
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cul45946-12.jpg (24098 bytes) general radio use
manuf CUL University
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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.
NT-49583
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spkr-49583-02.jpg (35266 bytes) - manuf CZY Allied Radio
NT-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)

LS-305/SIC
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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

LS-388/SIC
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70v line
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LS-444/WIH

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LS-530/SIC
ls530-sic-50.JPG (77135 bytes)
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70v line input
ls530-sic-52.JPG (42589 bytes) manuf Telectro Systems
LS-543/SIC
ls543-sic-01.jpg (19720 bytes)
ls543-sic-02.jpg (21862 bytes) - manuf University
MI-2915-FA
spkr-MI-2915-FA-01.jpg (18786 bytes)
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MI-2961
MI-2961-01.jpg (20551 bytes)
MI-2961-02.jpg (16414 bytes) - manuf RCA
NA-10001
na10001-spkr-01.jpg (10496 bytes)
na10001-spkr-03.jpg (16382 bytes) na10001-spkr-02.jpg (11157 bytes) manuf Jensen