SJ, SJa, SJ-1 SUBMARINE SURFACE SEARCH RADAR
Description.-A 10 cm surface-search and torpedo- control for installation on submarine. Number of operators.-One. Power supply.-SJ-1.5 kva, 115 V, 60 cps. SJa, SJ-1-1.4 kva, 115 v, 60 cps. SJ SJ-1 Maximum reliable range (miles): Bombers, 500 ft. 5. 5. Battleships 8. 12. Cruiser 8. 12. Destroyers 6. 8. Submarines (sur- faced) 3. 6. Beacons S Band Horizon. same. Resolution: Range (yd.) 50. 50. Bearing (deg.) 5. 5. Accuracy: Range (yd.). 25+-.l%. 15+-.1% (precision sweep). Bearing (deg.) +-0.3. 0.3 degree (with lobe switch). Minimum range (yd.) 250. 250.Indication and data output: Range: 5-inch A-scope with range step and dial. Main Sweep: 60,000 yd. Expanded Sweep 20,000 yds. Precision sweep on 40,000 yds. 1,500 yds. either side of mark. Bearing: Relative bearing read from train indicator. Pip match is optional. PPI: A 5-inch PPI is provided with SJ-a and SJ-1 Ranges: 8,000, 20,000, 80,000 yd. 160,000 yd. delayed sweep. Other: Provisions for IFF indication are present. Transmitter specifications: Frequency (Mc) 3000. R-f source Magnetron, 606AY. R-f lines Wave guide. Pulser type Thyraton-SJ; Peterson Co: 1 SJ2. R-f peak power (kw) SJ-20; SJ-1-50. R-f average power (kw) 0.018-SJ. Pulse rate (pps.) SJ-600 & 1800; SJ-1- 1500+-150. Pulse length (micro second) 0.25. Receiver specifications: Type Superheterodyne. Stages. 6 i-f; 3 video. Local oscillator 707A; SJ-1-726B. Intermediate frequency (Mc) 60. Band pass (Mc). 5 i-f; 5 video. Mixer Crystal SJ-1; grounded. grid triode-SJ. Noise, db above theoretical. 10. Antenna specifications: Total weight (lbs.) SJ-300; SJ-1-330. Feed Wave guide. Reflector: Old type Solid unhoused reflector. New type Slotted. Shape Truncated paraboloid. Size SJ-10" high x 30" wide. H.P. beam width: Horizontal 9 degrees. Vertical 29 degrees. Polarization Horizontal. Gain (db) 19 (SJ-1). Scan Continuous rotation through 360 degrees at 1 to 8 r.p.m. by motor or it may be trained manually. Left-right lobe switching. Divergence is 5 degrees. Elevation fixed.Tube complement.-1 type 705A, 1 type 706A or 706AY, 1 type 707A, 1 type 708A, 1 type 709A, 1 type 713A, 1 type 722A, 1 type 2X2/879, 1 type 5HP1, 4 type 5U4G, 1 type 6AB7, 14 type 6AC7, 1 type 6H6, 10 type 6L6, 10 type 6SN7GT, 4 type 6SQ7, 2 type VR-105/30, 3 type VR-150-30, 1 type 813, 2 type 836, 4 type 991. Dimensions and weights (SJ-1) Unit Navy Type Length Width Depth Weight Pampanito No. Inches Inches Inches Pounds Serial # Antenna assembly CW-66AFC 31 1/2 30 15 350 Transmitter re- CW-43AAF-1 20 5/8 18 7/8 13 190 #12,C.T. ceiver. Range indicator CW-55AAL-1 16 3/4 11 3/8 20 3/4 110 Plan position in- CW-55ADE 14 3/8 13 1/8 19 7/8 120 #6,C.T. dicator. Range unit CW-23ACC 6 9/16 9 1/2 18 3/4 67 #67,C.T. High voltage rec- CFZ-2OAAR-1 10 5/16 12 18 7/16 100 #6,P.R. tifier. Regulated recti- CFC-2OAAQ 18 1/4 10 21/32 17 5/8 115 #6A,6B P.R. fier (2). Main control unit. CFC-23ADH 14 1/4 15 1/4 13 125 C.T. Bearing indicator CW-55ADD 8 12 8 20 C.T.,C.R. Motor generator CW 12 37 3/4 12 110 control unit. Adapter control CW-23ABX 5 3/4 5 3/4 4 5/8 6 1/2 C.T.,P.R. unit. Junction box (2) CW-62AAB 14 17 9/16 4 5/8 32 Motor generator CG-21AAS 15 1/8 13 7/16 44 3/8 450 set. Range transmitter 6 1/2 9 1/32 9 1/2 26 Test Equipment.-ABM wave meter and OBU echo box included. OBU,C.T.Literature.-SJ instruction book (Eng. 188). SJ-1 instruction book (Ships 258). REFERENCES:The information enclosed here is excerpted from:Catalogue of Naval Electronic Equipment-April 1946- NavShips 900,116.
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