Navy Receiving Site RF and AF Signal Distribution
 - SDU Type A, B, C & AN/FRQ-9

• Back to Main COMMSTA Equipment Page
• Back to Receiver AF Switchboard & Patch Panel Page
• Back to Main Navy Radio Page
• Please send me e-mail if you have any more info

1950's Shore Station Receiver RF Distribution

		SDU at NAVCOMMSTA Kodiak - 1959 Note R-390 replacing RBC receiver -photo thanks to Tom Lawson	Patchboards at NAVCOMMSTA Guam - Note AN/FCC-3 multiplexer in Rack #14 and TH-39/UGT keyer in Rack #15
AN/FRQ-9 Monitor Set		AN/FRQ-9 Monitor Set

Signal Distribution Unit Type A, B, and C

FUNCTIONAL DESCRIPTION
The Navy Signal Distribution Unit Type A, B, and C are standardized RF and AF manually operated switching and monitoring equipments for use in Naval Shore communication centers. These equipments permit standardization of components, method of installation and maximum operational flexibility when installed.

Standardized components are available from Navy Stock which have been designed to mount in standard 19 inch relay rack cabinets in any desired order. Blank panel space is provided to permit expansion as additional components are required. The necessary Government furnished components may be obtained from Navy Supply Sources.

The Type A consists of three cabinets, the Type B consists of two cabinets and the Type C consists of one cabinet,. Basic operating procedures and components are the same of all three types, but the number, arrangement, and mounting of components are altered to fit the space available.

ELECTRICAL AND MECHANICAL CHARACTERISTICS 

• IMPEDANCE OF RF COMPONENTS: 70 ohms nominal. 
• IMPEDANCE OF RF LOADS; 600 ohms nominal. 
• POWER REQUIREMENTS: 115 v ±10%, 58 to 60 cps single ph, or 230 v ±10%, 58 to 60 cps may be substituted if all internally mounted components served are capable of operation on 230 v.
• CONNECTING CAPABILITIES
  • TYPE A: 32 antenna and 32 receivers. 
  • TYPE B: 22 antenna and 22 receivers. 
  • TYPE C: 11 antenna and 11 receivers.

MANUFACTURER'S OR CONTRACTOR'S DATA 
Airplane and Marine Instruments, Inc.; Clearfield, Pa.
Contract NObsr 30000, dated 23 April 1946.
Contract NObsr 52521, dated 4 June 1951.
Approximate Cost: $3300.00 with equipment spares. (Unit A),
Approximate Cost: $2600.00 with equipment spares. (Unit B),
Approximate Cost: $1500.00 with equipment spares. (Unit C).

REFERENCE DATA AND LITERATURE
NAVSHIPS 91047: Technical Manual for RF and AF Signal Distribution Unit.

SHIPPING DATA
NUMBER    IDENTIFICATION      VOLUME (cu.ft.)      DIMENSIONS (in)         WEIGHT (lbs)

Type A Unit
1 Cabinet CY-597/G including:               45                             25 X 32 X 93                     576 

• (1) Switch Panel SA-137G
• (3) Jack Panel J-238/G 
• (3) Jack Panel J-239/G 
• (2) Jack Panel J-237/G 
• (2) Jack Panel J-243/G 
• (2) Blank Panel Size "B" 
• (2) Blank Panel Size "C" 
• (2) Blank Panel Size "D"

1 Cabinet CY-597/G including:               45                             25 X 32 X 93                       518 

• (1) Jack Panel J-243/G
• (1) Jack Panel J-265/G 
• (1) Mounting MX-571/G 
• (1) Blank Panel Size "A"
• (1) Blank Panel Size "B"

1 Cabinet CY-579/G including                 45                            25 X 32 X 93                        583 

• (3) Jack Mounting Strip NT-491394
• (2) Patchcord Storage Panel MX-814/G 
• (2) Retainer-Pulley Assembly MX-813/G 
• (6) Terminal Board Assembly J-242/G 
• (1) Blank Panel Size "B"
• (1) Blank Panel Size "G" 
• (1) Blank Panel Size "F"

1 Container                                               13                        19 X 27 X 42                          274 

• (2) Technical Manual NAVSHIPS 91047
• (1) AF Switch Panel SA-135/G
• (16) Control C-443/G
• (1) Switchboard Shelf FN-28/G

1 Set of Spare Parts                                   1.3                  9-3/4 X 13-3/4 X 19-1/4               29 

Type B Unit
1 Cabinet CY-597/G                                  45                      25 X 32 X 93                            578 

• (1) Jack Panel J-265/G
• (1) Mounting MT-571/G
• (1) Switch Panel SA-137/G 
• (2) Jack Panel J-238/G 
• (2) Jack Panel J-239/G 
• (1) Jack Panel J-237/G 
• (2) Jack Panel J-243/G 
• (1) Blank Panel Size "B" 
• (1) Blank Panel Size "C" 

1 Cabinet CY-597/G including:                   45                      25 X 32 X 93                            570 

• (5) Jack Mounting Strip NT-491394
• (2) Patchcord Storage Panel MX-814/G 
• (2) Retainer-Pulley Assembly MX-813/G 
• (5) Terminal Board J-242/G
• (2) Blank Panel Size "A" 
• (1) Blank Panel Size "F" 

1  Container                                               10                        16 X 26 X 41                           229 

• (2) Technical Manual NAVSHIPS 91047
• (1) Box of Misc. Hardware, Connectors, Lacing Twine etc
• (1) Speaker Assembly LS-139/G 
• (1) AF Switch Panel SA-135/G 
• (1) Control C-443/G
• (1) Switchboard Shelf FN-28/G

1 Set of Spare Parts                                     1.3                9-3/4 X 13-3/4 X 19-1/4                 26 

Type C Unit
1 Cabinet CY-597/G including:                      45                 25 X 32 X 93                                  539 

• (1) Jack Panel J-237/G
• (1) Jack Panel J-238/G 
• (1) Jack Panel J-239/G 
• (1) Jack Panel J-243/G
• (2) Jack Mounting Strip NT-491394
• (1) Patchcord Storage Panel MX-814/G 
• (1) Retainer-Pulley Assembly MX-813/G 
• (2) Terminal Board Assembly J-242/G 
• (1) Blank Panel Size "A"
• (1) Blank Panel Size "E"

1 Container

• (2) Technical Manual NAVSHIPS 91047
• (1) Box of Misc Hardware, Connectors Lacing Twine etc
• (1) Speaker Assembly LS-139/G 
• (1) Switchboard Shelf FN-28/G

1 Set of Spare Parts                              0.86                 8-3/4 X 10-3/4 X 17-1/8               16

EQUIPMENT SUPPLIED DATA

A    B    C
3     2     1     Cabinet CY-597/G including:             22-3/8 X 26 X 87-1/2      276
                         Mounting Strips and appropriate mounting clips
1     1     1     Switch Panel SA-134/G       2-7/8 X 6-31/32 X 20-5/8     10 
1     1     2     Conduit end Cover
1     1     -     Switch Panel SA-135/G       5-7/32 X 11-3/4 X 19     10.3
1     1     -      Switch Panel SA-137/G     12 X 12-7/32 X 19     25
16   11   -      Control C-443/G                 5-7/32 X 7 X 7-3/4     5
2     1     1     Jack Panel J-237/G             1-23/32 X 2-1/8 X 19     2.3
3     2     1     Jack Panel J-238/G             3 X 5-7/32 X 19         10.2
3     2     1     Jack Panel J-239/G             1-23/32 X 4-i1/4 X 19     4.9
3     2     1     Jack Panel J-243/G             7 X 8-23/32 X 19         70.3
1     1     -     Jack Panel J-265/G             1-23/32 X 2-1/8 X 19     14
6     5     2     Terminal Board Assembly J-242/G         3-15/32 X 4 X 19         2.9
1     1     1     Speaker Assembly Panel LS-139/G     6-1/4 X 8-23/32 X 19     8.9
1     1     1     Switch Board Shelf FN-28/G     8-23/32 X 16-3/4 X 22-1/2         45.5
1     1     -     Mounting MT-571/G            1-23/32 X 16-7/8 X 19         12.1
6     5     2     Jack Mounting Strip NT-491394         1-23/32 X 3-3/8 X 19         5.8
2     2     1     Patchcord Storage Panel MX-814/G          1-1/4 X 1-23/32 X 19         2
2     2     1     Retainer-Pulley Assembly MX-813/G         2-3/4 X 3- /u X 20-1/4         8.5
5     6     3     Blank Panels Size "A"                 3/16 X 1-23/32 X 19         0.6
5     3     2     Blank Panels Size "B"                 3/16 X 3-15/32 X 19   1.3
2     2     1     Blank Panels Size "C"                 3/16 X 5-7/32 X 19   1.9
2     3     1     Blank Panels Size "0"                  3/16 X 6-31/32 X 19   2.5
1     1     1     Blank Panel Size "E"                   3/16 X 8-23/32 X 19   3.1
1     1     -     Blank Panel Size "F"                    3/16 X 10-15/32 X 19   3.7
1     -     1     Blank Panel Size "G"                   3/16 X 12-7/32 X 19   4.4
1     -     -     Blank Panel Size "H"                    3/16 X 13-31/32 X   19 5 
263 186 77  Connectors NT-49190
20   15   10   Panel Screws    #10/32 X 1/2 RH 
2     2      2    Code Marker Sets
22   22   11   AF Patchcords installed in MX-814/G NT-491397A     36 in. lg     0.5 
1     1     1     Spool #6 lacing twine
12   8     4     Cabinet holding-down bolts (1/2 in. X 3 in. lg bolts)
36   24  12    Clamp Bars each Complete with 3 #10/32 X 1 in. round screws 11-3/4 in. lg
1     -     -      Set of equipment Spares         6-1/4 X 10-1/4 X 13-1/4             19
-     1     -      Set of Equipment Spares         6-1/4 X 10-1/4 X 13-1/4             16
-     -     1      Set of Equipment Spares         5-1/4 X 7-1/4 X 11-1/8 9             2 
2     2     2     Technical Manual NAVSHIPS 91047

GFE
1     1     1     Ohmmeter ZM-1/u             3-15/32 X 11 X 19             11.9
1     1     1     Multimeter OBQ-4             5-7/32 X 19 X 7-1/2             12
1     1     1     Volume Level Indicator TS-629/U         3-15/32 X 19 X 20
1     1     1     Oscilloscope OBL-3a with:                     6-31/32 X 15-1/2 X 19         26.7 
                          Mounting Adapter Kit NT-RL-10625
1     1     -     Frequency Meter LR-1                             17-1/2 X 19 X 22-3/4             155
-     -     1     Frequency Meter IM-15a with:                 8-23/32 X 15-i/2 X 19             123 
                        Mounting Adapter Kit NT-R1-10625
1     -     -     Radio Receiver RBC Series with:               14-3/4 X 19 X 20-1/8             82 
                        Rack Mounting Cabinet NT-10350
1     -     -     Power Supply NT-20130 with:                   10 X 14 X 19                         52 
                        Rectifier Mounting Shelf NT-10348
1     1     1     Set of Electrical Accessories
1     1     1     Set of Tools