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
nt91397-01.JPG (138586 bytes)
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
id1185-fra-06.JPG (62233 bytes)
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

Manual for TS-629A/U

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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)

sb82-101.jpg (11504 bytes)

sb82-1402-02.jpg (63427 bytes)   SB-82/SRR  manual  

  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
sb2727-01.jpg (56777 bytes)
AF switching
20 remotes, 24 receivers

sb2727-srr-52.jpg (50991 bytes)

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

am215a-u-01.JPG (172182 bytes)
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

AM-413/G manual download

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 - Manual

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AM-4453/U
am4453-dj-04.jpg (164952 bytes)

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

Photos and manual thanks to Daniel K6YIC

 

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AM-6222/U
AM-6223/U
audio amp
am6223-u-1103.JPG (11734 bytes)

am6223-u-1102.JPG (19981 bytes) am6223-u-1100.JPG (96936 bytes) am6223-u-1101.JPG (86178 bytes)

AN/GSA-33
audio amp & compressor
gsa33-01.jpg (21763 bytes)

Amplifier Group
5 channel compressor

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

Adjustment procedure and info

gsa33-02.jpg (22434 bytes)

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
af-atten-01.JPG (1288025 bytes)

shipyard built item
aboard USS Midway
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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

manual

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LS-139/G

Rack mount twin speaker
used in Comm Stations

ls139-g-41.jpg (37241 bytes)

ls139-g-21.jpg (38467 bytes)

Version without phone jacks
Manuf Westlab & others
ls139-g-1303-02.jpg (127537 bytes)

Version with phone jacks
manuf Airplane & Marine Instruments
ls139-g-42.jpg (45165 bytes)

Another version 
(DSA, not USN - manuf Adek)
ls139-g-31.jpg (29302 bytes)

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Another version (not USN)
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ls139-g-1303-01.jpg (182335 bytes)

NAVSHIPS 93095

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LS-169/G

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)

LS-195/U
ls195-1306-01.JPG (337951 bytes)

   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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ls195-1904-01.jpg (181942 bytes) ls195-1904-02.jpg (159947 bytes) ls195-1904-03.jpg (157618 bytes) ==

LS-199/U (for AN/URR-23A)
ls199-1412-01.jpg (126464 bytes)

ls199-1412-02.jpg (163572 bytes) LS-228/U (for AN/URR-39)
ls228-u-91.jpg (74855 bytes)
ls228-u-92.jpg (60729 bytes)

LS-474/U
ls474-u-01.jpg (23533 bytes)

ls474-int.JPG (1839939 bytes) Manuf Fidelity Amplifier

ls474u-95.jpg (257895 bytes)

spkr-ls474-cv41-01.JPG (3036314 bytes)
LS-474/U + AM-3729/SR amplifier aboard USS Midway

CMX-49131 amplifier-loudspeaker
spkr-CMX49131C-1210-01.JPG (467291 bytes)

Information - specs

Schematic & Parts List

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Manuf Magnavox

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spkr-CMX49131C-1210-09.JPG (336312 bytes) spkr-CMX49131C-1210-10.JPG (606975 bytes) == ==

CMX-49155 (for TBS)
spkr-tbs-49155-120401.JPG (311130 bytes)

 

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CMX-49545 amplifier-loudspeaker

spkr-49545-1208-01.jpg (126428 bytes)

    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

Specifications

cul45946-10.jpg (136380 bytes)

cul45946-12.jpg (24098 bytes) general radio use
manuf CUL University
manuf Tabet
cul45946-11.jpg (50453 bytes)
49546-int-01.JPG (5290377 bytes)
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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.

CZY-49583
spkr-49583-1511-01.jpg (255891 bytes)

spkr-49583-1511-02.jpg (297408 bytes)

manuf CZY Allied Radio

spkr-49583-1511-05.jpg (280695 bytes) spkr-49583-1511-04.jpg (226095 bytes)

CZC-49587 (used with RCH)

spkr-49587-rch-2001-01.jpg (95580 bytes)

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CMX-49620  amp/speaker
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spkr-nt49620-1103.jpg (111588 bytes)

Amp & 8" Speaker

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cmx49620-103.jpg (127307 bytes) cmx49620-108.jpg (14826 bytes)

cmx49620-106.jpg (9692 bytes)

manuf CMX Magnavox-

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CCI-491120
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General Purpose & PA loudspeakers (Interior Communications)

AM-2320A/WIC amplifier-loudspeaker
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LS-305/SIC
ls305-sic-01.jpg (6640 bytes)
ls305-sic-02.jpg (13381 bytes)
70v line input. Transformer taps give up to -24dB attenuation
ls305-sic-03.jpg (6483 bytes) manuf Tabet, Dynalec

Download spec sheet

LS-306A/SIC
ls306a-sic-1207-01.jpg (289085 bytes)
ls306a-sic-1207-02.jpg (286249 bytes) ls306a-sic-1207-03.jpg (238599 bytes) ==
LS-388/SIC
ls388-sic-01.jpg (59768 bytes)
ls388-sic-02.jpg (64355 bytes)
70v line
ls388-sic-03.jpg (68726 bytes) ls388-sic-04.jpg (58902 bytes)
LS-444/WIH

ls444-wih-1308-1.JPG (62282 bytes)

ls444-wih-1308-2.JPG (56036 bytes) ls444-wih-1308-3.JPG (39219 bytes) ls444-wih-1911-02.JPG (2648866 bytes)
LS-519/SIC
ls519-sic-01.jpg (66343 bytes)
ls519-sic-02.jpg (232363 bytes)    
LS-530/SIC
ls530-sic-50.JPG (77135 bytes)
ls530-sic-51.JPG (78578 bytes)
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
RCA MI-2915-FA
spkr-MI-2915-FA-01.jpg (18786 bytes)
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
spkr-74404-1207-01.jpg (206610 bytes)
spkr-74404-1207-04.jpg (166089 bytes) spkr-74404-1207-05.jpg (367389 bytes) manuf RCA
spkr-74404-1207-03.jpg (214441 bytes)
RCA MI-2961
MI-2961-01.jpg (20551 bytes)
MI-2961-02.jpg (16414 bytes) - manuf RCA
Jensen NA-10001
na10001-spkr-01.jpg (10496 bytes)
na10001-spkr-03.jpg (16382 bytes) na10001-spkr-02.jpg (11157 bytes) manuf Jensen
VRS-1 recording equipment
spkr-vrs1-01.JPG (166917 bytes)
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Speakers for use with Underwater Sound Equipment

LS-185/U for AN/SQS-1 Sonar
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ls185-1804-01.jpg (48286 bytes) ls185-u-1303-02.jpg (338274 bytes) ls185-u-1303-03.jpg (384453 bytes)
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
spkr-cbm49225-02.jpg (69327 bytes)
spkr-cbm49225-01.jpg (71883 bytes) == ==
CJS-49235 for QJB Sonar
spkr-49325-1207-01.jpg (21212 bytes)
spkr-49325-1207-02.jpg (36128 bytes) spkr-49325-1207-03.jpg (23913 bytes) ==