WCA, WCA-1 ECHO RANGING LISTENING AND SOUNDING EQUIPMENT
Contract number. -NOs-82337.
Description.-Model WCA and WCA-1 equipments combine in one
system two separate ranging/listening equipments and a sounding equipment.
The two models are essentially the same, differing principally only in
their power requirements. A complete installation includes two ranging/listening
projectors, one Rochelle salt and one magnetostrictive, mounted port and
starboard on the boat; a sounding projector; two drivers, one of which
is used alternately for ranging or sounding; and four receivers. The ranging/listening
projectors are trained independently.
Keying interval.-Ranging-5,000 yards and manual. Sounding-400, 800, 2,000, and 4,000 fathoms.
Maintenance of true bearing.-No.
Maintenance of close contact.-No.
Bearing deviation indicator.-No.
Tuning.-Magnetostrictive system, receivers and driver separate; Rochelle salt system, receiver and driver unicontrolled.
Range indication.-Revolving disc.
Sweep frequency modulation.-Yes; on Rochelle salt system.
Hoist-lower system characteristics.-Theranging/listening projectors are spherical in shape, and may be retracted into sea chests in the hull. In some installations a nonretractable streamlined dome is welded to the hull around one of the projectors, in order to permit operation at higher speeds than would be possible with the unstreamlined sphere. The hoist mechanism is hydraulic, and is not supplied by the contractor but is constructed by the building yard.
Training system characteristics.-Training is electrical, remotely controlled by a d. c. system. A motor generator set supplies the voltage to operate the training motor, the magnitude and polarity of the voltage being regulated by a lever switch at the remote control station which controls the generator field. Limit switches and positive stops restrict training to an arc of 1020 degrees. Slip rings for the projector connections are included in the MATD modification, permitting unlimited training in either direction. Projector bearing is repeated to the control stack by a synchro system.
Power requirements.-WCA-175-335 volts d. c., 6.6 kw. WCA-1-90-150 volts d. c., 6.6 kw.
Tube complement.-9 type 6C6, 13 type 6D6, 8 type 41, 6 type 76, 3 type 874, 4 type 5Z3, 1 type Argon CD 22 CL, 4 type 807, 4 type 838, 3 type 6J5, 4 type 6AB7, 2 type 836, 3 type 5U4G, 3 type 6A6.
Projectors.-Three projectors are used, designated respectively
"QC-JK" (ranging/listening); "QB" (ranging/listening) ; and "NM" (sounding).
Transmitting system.-Two drivers are supplied with each equipment,
one for the magnetostrictive projectors, either ranging or sounding, the
other for the Rochelle salt (QB) ranging projector.
Receiving system.-Four receivers are included in each WCA
system. The sounding receiver is of the tuned radio frequency type, while
the other three, including one for each ranging system and an emergency
listening receiver, are identical superhetrodyne units.
Keying and indicating system.-
Dimensions and weight.-The components comprising the WCA and WCA-1 systems are located in three compartments on the submarine: Forward torpedo room, control room, and conning tower. In the forward torpedo room are located the QC/NM driver, the QB driver-rectifier, spare receiver, MG set, local control unit, the NM projector, and the hoist-training systems for the QB and QC-JK projectors. The sounding amplifier and indicator are installed inn the control room. In the conning tower are located the range indicator, QB and QC-JK receivers, remote control units, and loud-speaker, arranged in a single stack.
NAVY TYPE NUMBERS Pampanito Quantity Unit WCA WCA-1 Serial # 3 Receiver amplifier CBM-46165 CBM-46165 #241,F.T.R., #177,#181 C.T. 2 Receiver power supply CBM-20062 CBM-20062 1 Receiver power supply CBM-20264 CBM-20064 #80,F.T.R. 1 Range indicator CBM-55078 CBM-55078 #72,C.T. 1 Remote train control (QC- CBM-23279A CBM-23336 #95,F.T.R.,#61,C.T. JK). 1 Remote train control (QB) CBM-23279 CBM-23336A #61,C.T. 1 Driver (QC/NM) CBM-52251 CBM-52251 #68,F.T.R. 1 Driver (QB) CBM-52252 CBM-52252 1 Sounding amplifier, includ- ing) 1 Receiver CBM-46166 CBM-46166 1 Indicator CBM-55077 CBM-55077 1 Receiver power supply CBM-20059A CBM-20059A 2 Filter junction box CBM-53029C CBM-53029C 1 Training unit CBM-10035A CBM-10150 1 Training unit CBM-10060 CBM-10149 2 MG set (training) CBP-21356 CBP-21472 P.R. 2 Magnetic controller (train-CAE-21393 CAE-21883 P.R. 1 MG set (power) CBP-21706A CBP-21830 F.T.R. 1 Magnetic controller (power)CAE-21697 CAE-21882 1 Projector (sounding) CBM-78155 CBM-78155 1 Projector (QC-JK) CBM-78153 CBM-78153 1 Projector (QB) CBM-78154 CBM-78154 1 Loud speaker CBM-49032 CBM-49032 F.T.R. 1 Master switch CAE-24127 CAE-24127 1 Double jack box CBM-49057 CBM-49057 1 Single jack box CBM-49056 CBM-49056 1 Jack box CBM-49056 CBM-49056 1 Hand key CJB-26003A CJB-26003A.
DIMENSION AND WEIGHTS OF MAJOR UNITS Unit Height Width Depth Weight Inches Inches Inches Pounds Receiver amplifier 15 15 15 150 Receiver power supply 10 7 7 26 Sounding indicator amplifier 24 15 22 225 Range indicator 24 15 22 103 Remote train control 24 15 11 88 Driver (QC/NM) 30 15 22 290 Driver (QB) 22 15 22 275 Training unit 37 15 20 326 MG set (training) 35 17 16 465 Magnetic controller-training 15 13 20 75 MG set (power) 23 13 10 280 Magnetic controller-power 17 13 20 100 Projector (sounding) 23 13 10 280 Projector (QC-JK) 21 19 19 555 Projector (QB) 21 19 19 510Literature.-Maintenance Manual for WCA, WCA-1, NavShips 900,045.
REFERENCES:The information enclosed here is excerpted from:
Catalogue of Naval Electronic Equipment-April 1946- NavShips 900,116.