Navy Receiving RF Patch Panels & Switches

note - NT means "Navy Type" and is replaced with manuf code (e.g. CN-49121A is NT-49121A plug manuf by National Electrical Supply (code CN))

1950's Shore Station Receiver RF Distribution

RECEIVING RF SIGNAL DISTRIBUTION - (reference NAVSHIPS 91047 and NAVSHIPS 900,121)

SDU RF and AF Signal Distribution Unit Type A, B, C  
rf-af-01.JPG (279071 bytes)
for communication station receiving sites

photo,  info, manual download

manual is NAVSHIPS 91047    -
AN/FRA-3 fra3-01.JPG (300287 bytes) fra3-02.JPG (240556 bytes) RF switching group for shore station installations

Allows 5 operators to remotely select one of 40 antennas

RF distribution diagram

NAVSHIPS 91500 - please send e-mail if you have a manual or any parts of AN/FRA-3

NT-23404
NT-23405
NT-23406
NT-23407
nt23406-01.JPG (102237 bytes)
nt23406-02.JPG (105940 bytes)
 NT-23406
receiving antenna patch panels
23404 - 30 antennas, 30 rcvrs
23405 - 18 antennas, 18 rcvrs
23406 - 9 antennas, 18 rcvrs
123407 - 2 antennas, 12 rcvrs
each antenna (or interspace cable) is connected to 4 jacks, 1 directly and 3 through 600 ohm decoupling resistors

uses NT-49120 jacks and NT-49121 plugs

-
SB-346/S 3-46.jpg (21915 bytes) antenna patch panel
12 receivers, 3 antennas
type C connectors for patch cords?, type N connectors for rcvrs & antennas - need more info
sb346-01.JPG (10227 bytes)
sb346-02.JPG (6414 bytes)
Photos to left look like two units in one cabinet?

manuf Federal Television

COMPONENTS
J-237/G j237-g-04.JPG (27065 bytes)
j237-g-07.JPG (32852 bytes)
j237-g-05.JPG (33512 bytes)
RF jack panel used in shore station installations - contains eleven UG-294/U feed-through jacks
j237-g-09.JPG (12656 bytes)
UG-294/U - Navy Type jack feed-through to UHF jack on rear
j237-g-08.JPG (30165 bytes)
manuf 
CN - National Electrical Supply
J-238/G

j238-g-05.JPG (60258 bytes)

RF bridging jack panel used in shore station installations - contains eleven NT-491729 modules
j238-29.JPG (29572 bytes)
NT-491729 module with 4 front NT-49120 jacks and 3 rear UHF jacks all tied together
j238-31.JPG (44586 bytes)

manuf CIA - Dumont Radio 
CIA-491729

J-239/G j239-g-61.JPG (14640 bytes)

j239-g-62.JPG (21170 bytes)

RF switching jack panel used in shore station installations - contains eleven NT-491388 modules 
sb-switch-02.jpg (6508 bytes)

 

NT-491388 module
sb-switch-01.JPG (27079 bytes)
"Normal-Through" operation - the loop between two UHF jacks on rear is broken when NT-49121 plug is inserted in front jack

manuf CIA - Dumont Radio 
CIA-491388

NT-28006A need photo Receiver Protective Device
50 or 100 watt light bulb in a cylindrical can to protect rcvr front end,
- -
NT-49120 j237-g-05.JPG (33512 bytes) mating jack for NT-49121 plug - -
NT-49121
NT-49121A
patch-49121A.JPG (8229 bytes)
photo thanks to W7QHO
Connector used for RF patch cords
(also for RBB/RBC and other receivers)

Type CN-49121A Antenna Plug, Navy Stock Number N17-C-71120-4869

Connector, Plug: 1 round female contact; straight type; over-all 2-7/8" long by 13/16 " diameter; RF connector; cylindrical body; brass; nickel plated; Bakelite insert; 13/32 max cable opening.


nt-coax-assy-02.JPG (107487 bytes)
Assembly Instructions

manuf
CN - National Electrical Supply 
CN-49121A
NT-49122
NT-49123
NT-49150
need photos Patch cords using NT-94121 plugs
49122 - 18" long
49123 - 36" long
49150 - 48" long
    - -
SA-136/G
SA-137/G
SA-138/G
need photos RF switch panels used in shore station installations
SA-136/G is 20 position panel
SA-137/G is 40 position panel
SA-138/G is 60 position?
- -
SA-274/U
switch
sa274-u-02.JPG (34707 bytes) sa274-u-03.JPG (32112 bytes) 4 position selector switch -
SA-275/U
switch
sa275-u-01.jpg (10769 bytes) sa275-u-03.jpg (11493 bytes) 6 position selector switch -
SA-598/U sa598-u-01.JPG (45082 bytes) switching jack module - replaces NT-491388 in J-239/G but with TMC QDS front panel jacks

Note - Mating plug is UG-968/U

sa598-u-02.JPG (7748 bytes) manuf TMC model SW-195
SB-931/U sb931-u-01.JPG (5335 bytes)
need better photo
replaces J-237/G panel but with eleven TMC QDS front panel jacks QDS on front, UHF on rear manuf TMC model QDP-411A
SB-932/U sb932-u-01.JPG (110966 bytes) RF switching jack panel used in shore station installations - eleven modules
- replaces two J-239/G - uses two TMC QDS jacks on front and two UHF jacks on rear
Dual "Normal Through" - the loop between two UHF jacks on rear is broken when QDS plug is inserted in either front jack manuf TMC model SPP-3

 

TMC SPP like SB-932/U but with BNC jacks on rear
tmc-spp-04.JPG (126845 bytes)
tmc-spp-03.JPG (112297 bytes)

Rear (with one UHF-connector module)
tmc-spp-02.JPG (110545 bytes)

tmc-spp-01.JPG (186344 bytes) manuf TMC model SPP
TMC SW-224 Dual "Normal-Through" modules used in SPP
tmc-sw224-01.JPG (81185 bytes)
tmc-sw224-04.JPG (164314 bytes) Plug not inserted
tmc-sw224-03.JPG (157748 bytes)
Plug inserted
tmc-sw224-02.JPG (172659 bytes)