ST, STa, ST-1 SEARCH RADAR
Description.-A 3 cm. range-determining radar for submarine
installation.
Number of operators.-One. Weight installed.-500 lb. excluding indicator. Power supply.-1.5 kva, 115 volts, 60 cps, 1 phase. Maximum reliable range (miles): Battleships 5 Cruisers 5 Destroyers 3 Submarines 3Minimum range 250 yds. Resolution: Range 75 Bearing 20 Accuracy: Range (yd.) 15+-0.1% Bearing +-5 degreesIndication and data output: Range: 5-inch A scope of SJ or SS indicator. Ranges: 10, 30 miles. Bearing: Bearing dial. PPI: None. Provisions for IFF display. The ST uses the same indicator as the SJ or SS. Antenna specifications: Total weight (lb.) Periscope, 2000 lb.; adapter unit, 300 lb. Feed 2-inch by 6-inch horn mounted in the periscope. H.P. beam width: Horizontal 25 degrees. Vertical 12 degrees Polarization Horizontal Gain (db) 15 Scan By hand. Antennas height is variable from 1 to 50 ft. Transmitter specifications: Frequency (Mc) 10 000. R-f source Magnetron, 2J50. R-f lines Wave guide. R-f peak power (kw) 30. R-f average power 0.03.(kw). Pulse rates (pps) 1500+-150; 600+-30. Pulse lengths (micro second) 0.25. Receiver specifications: Type Superheterodyne. Local oscillator 723. Intermediate frequency (Mc) 60. Band passe (Mc) 3 i.f. with SJ; 4 i.f. with SS. Mixer 1N21A. Noise, db above theoretical 14.6.Tube complement.- 1 type 2J50; 1 type 705A; 2 type 724B; 1 type 5021; 1 type 6H6; 4 type 6V6-GT; 10 type 6SN7GT; 1 type 723A/B; 5 type 6AK5; 2 type VR15O/30; 4 type 991 (NE16); 8 type 6AC7; 1 type 2X2/879. Dimensions and weight Unit Navy Type Height Width Depth Weight Pampanito No. Inches Inches Inches Pounds Serial # Selector unit 24AAH 14 3/4 16 9/16 16 13/16 95 #166,C.T. Transmitter receiver 43ACU 19 1/2 15 11/16 27 230 #166,C.R. Selector control unit 23AFP 4 5/8 7 7/8 3 1/2 15 #178,C.T. Periscope adapter 14ABB 48 18 dia. 18 300 Wave guide switching unit 24AAF 3 7/8 10 11 1/2 20 C.R. Echo box 14AAX 15 18 7/8 16 1/4 40 C.R. Wave guide pick-up l4ABJ 3 7/8 8 1/8 11 1/8 16 C.R. Junction box 62ABK 17 9/16 13 1/4 4 7/8 40 C.R. Dummy antenna 66AHT 1 3/4 7 13/16 2 8 C.R. Transmitter mtg. frame 10376 27 15/16 19 1/8 13 19/32 80 C.R.Literature.-Instruction book (NavShips 900,336-IB). REFERENCES:The information enclosed here is excerpted from:Catalogue of Naval Electronic Equipment-April 1946- NavShips 900,116.
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