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))
RECEIVING RF SIGNAL DISTRIBUTION - (reference NAVSHIPS 91047 and NAVSHIPS 900,121) |
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| SDU | RF and AF Signal Distribution Unit Type A,
B, C  |
for communication station receiving sites | manual is NAVSHIPS 91047 | - |
| AN/FRA-3 |  |
 |
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 |
  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 |  |
antenna patch panel 12 receivers, 3 antennas type C connectors for patch cords?, type N connectors for rcvrs & antennas - need more info  |
  |
Photos to left look like two units in one cabinet?
manuf Federal Television |
| COMPONENTS | ||||
| J-237/G |    |
RF jack panel used in shore station installations - contains
eleven UG-294/U feed-through jacks
|
UG-294/U - Navy Type jack feed-through to UHF jack on
rear
|
manuf CN - National Electrical Supply |
| J-238/G |
|
RF bridging jack panel used in shore station installations - contains
eleven NT-491729 modules |
NT-491729 module with 4 front NT-49120
jacks and 3 rear UHF
jacks all tied together
 |
manuf CIA - Dumont Radio |
| J-239/G | 
|
RF switching jack panel used in shore station installations - contains
eleven NT-491388 modules 
|
NT-491388 module |
"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 |
| NT-28006A | need photo | Receiver Protective Device 50 or 100 watt light bulb in a cylindrical can to protect rcvr front end, |
- | - |
| NT-49120 | |
mating jack for NT-49121 plug | - | - |
| NT-49121 NT-49121A |
 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. |
|
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 |
 |
 |
4 position selector switch | - |
| SA-275/U switch |
 |
 |
6 position selector switch | - |
| SA-598/U |  |
switching jack module - replaces NT-491388 in J-239/G but
with TMC QDS front panel jacks
Note - Mating plug is UG-968/U |
 |
manuf TMC model SW-195 |
| SB-931/U |  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 |  |
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 |
Rear (with one UHF-connector module) |
 |
manuf TMC model SPP |
| TMC SW-224 | Dual "Normal-Through" modules used in SPP |
 |
Plug not inserted |
Plug inserted |
