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

AN/FRQ-9 Monitor Set
frq9-spec-01.JPG (199786 bytes)


frq9-spec-02.JPG (58571 bytes)

Please let me know if you have a copy of the AN/FRQ-9 manual for sale or loan for me to scan

-- Guam - patch panel
Patchboards at NAVCOMMSTA Guam

SDU Signal Distribution Unit

rf-af-01.JPG (279071 bytes) kodiak-sdu-1959.jpg (98475 bytes)
SDU at NAVCOMMSTA Kodiak - 1959 - Note R-390A replacing RBC receiver -photo thanks to Tom Lawson
   

sdu-fn28g-01.jpg (460348 bytes)

sdu-block-61.JPG (87581 bytes)- RF Wiring

sdu-block-62.JPG (81169 bytes)

AF Wiring

sdu-block-64.JPG (89349 bytes)

AF Jack Wiring

sdu-block-63.JPG (61528 bytes)

Navy Type -491394 is a size A panel which includes mounting for 52 Telephone Jacks, Navy Type -491395, arranged in two rows of 26 jacks each. Wiring, which is installed by the installation activity, is so connected that horizontally adjacent pairs connect to the two sides of a single circuit. Only the tips of the twin plug patchcords make connection. The vertically adjacent jacks are connected in parallel in such a fashion that when a patchcord is inserted into the top pair, the normal circuit to the load is broken and a new connection substituted; but when a patchcord plug is inserted into the bottom jacks., the normal circuit is unaltered and the patchcord is then in parallel. Thus, a total of 13 circuits may be connected into any one lack Mounting Strip.
NT-491394 Audio Jack Panel
jack-491394-01.JPG (1354197 bytes)

jack-491394-03.JPG (1436567 bytes)

Two rows of 13-pairs, 2-conductor
jack-491394-02.JPG (1307658 bytes)
jack-491394-05.JPG (1175109 bytes) jack-491394-04.JPG (1327414 bytes)

Control C-443/G

Control C-443/G is the connecting link between the Signal Distribution Unit and the AF output from two radio receivers at each operator's position within the station, or any remote position included in the Distribution System. This component which is designed for mounting under the front edge of a Standard Navy Operator's Table consists essentially of a three position rotary selector switch used for selection of either or both receiver outputs to the operator's phones, a set of toggle switches for connecting the receiver audio circuits to the Distribution Unit, and four pairs of phone jacks for the operator's headset connections. The operator's headset is normally connected to the set of jacks designated "SEL" which permits either or both receiver outputs to be impressed on the phones by the action of the three position rotary selector switch. The set of jacks designated "U" may be connected from a utility line to the operator's position. The jacks marked Receiver "A" and Receiver "B" are connected in parallel with the receiver outputs and are used to connect the operator's headset to each receiver without the use of the selector switch. The construction of all jacks is such that headsets equipped with Navy Type -49109 single plugs are inserted in the left hand jack, and those equipped with Navy Type -491242 twin plugs are inserted in both jacks.

The toggle switches connect the receiver outputs to the audio lines between Control C-443/C and the Receiver Output Terminal Boards J-242/G. With the switches open, the operator has the receiver outputs available at his phones, and the selector switch permits either or both receiver outputs to be heard.

C-443/G AF Control and Jack Box
- installed at each receiver operating position
c443-g-01.JPG (4035869 bytes)
C-443/G schematic  

c443-g-03.JPG (3697627 bytes)

c443-g-05.JPG (3813170 bytes) c443-g-04.JPG (4017510 bytes)
LM-15A frequency meter in RL-10624 mount - used in Type C SDU rl10624-lm15-01.jpg (29559 bytes) rl10624-lm15-03.jpg (54203 bytes) rl10624-lm15-04.jpg (36499 bytes)
rl10624-lm15-05.jpg (56255 bytes) rl10624-lm15-02.jpg (39408 bytes) rl10624-lm15-06.jpg (72791 bytes) rl10624-lm15-07.jpg (75747 bytes)

NAVSHIPS 91047 SDU Manual - 36 MB pdf download
(thanks to AWA library)

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 

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

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

1 Container                                               13                        19 X 27 X 42                          274 

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

1  Container                                               10                        16 X 26 X 41                           229 

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 Container

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 LM-15a with:                 8-23/32 X 15-i/2 X 19             123 
                        Mounting Adapter Kit NT-RL-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