## Shipborne Search Sets

See also CIC Manual for descriptions of radars integrated into Combat Information Centers, PPI, IFF, etc.

## CXAM and CXAM-1 Long Wave Search Sets for Large Ships

CXAM-I Antenna on Battleship

DESCRIPTION AND USES: Long-wave search sets for large ships. They provide range and bearing of surface vessels and aircraft, and are equipped with an "A" scope. (These sets are no longer in production.) PERFORMANCE: With antenna at 130 ft., reliable maximum range on large aircraft is 50 miles, and on large ship, 25,000 yards. Range accuracy is about ± 200 yds. Azimuth accuracy ± 3°. INSTALLATION: Sets have 9 components weighing a total of about 5000 lbs. Heaviest unit is the antenna, which, with pedestal, weighs 1500 lbs. Antenna proper measures 15' x 15'8". PERSONNEL: Minimum operating personnel: one per shift. POWER: Primary power required is less than 5 KW, 110 V. 60 cycles. Motor-generator is supplied with set if ship's power is not suitable.

## SC, SC-1, SC-2 and SC-3 Long Wave Search for Destroyers and Larger

SC-2 on Destroyer

DESCRIPTION AND USES: Long wave search sets, installed on destroyers and larger ships to search for planes and surface vessels and for control of interception. All sets have an "A" scope, provision for IFF connections, and work with a gyro-compass repeater. SC-2 and SC-3 also have PPI scopes, remote PPI's, and built-in BL and BI *antennas.PERFORMANCE: With antennas at 100', SC and SC-1 (without preamplifier) have a reliable maximum range of 30 miles on medium bombers at 1,000' altitude. With preamplifier, SC-1's range is extended to 75 miles -- the same as that of SC-2 and SC-3. Range accuracy of SC is ± 200 yards; later models have an accuracy of ± 100 yds. bearing accuracy of SC and SC-21 is ± 5°; of SC-2 and SC-3, ± 3°. There is no elevation control on any of the sets, but height can be estimated roughly from positions of minimum signal strength. TRANSPORTABILITY: Shipment includes spares for each set. If separate generator is needed, it is included in shipment. Not air transportable. INSTALLATION: Both SC and SC-1 have 5 components weighing a total of 1800 lbs. SC-2 has 6 components weighing a total of 3,000 pounds. Weights and dimensions of antenna assemblies are 450 lbs. 6'11 ^{1}/2" x 8'6" for SC and SC-1; 478 lbs. 4'6" x 15' for SC-2 and SC-3. Antennas should be mounted as high as possible, preferably 100 feet or more, above other superstructures.PERSONNEL: One operator per shift is minimum on all 3 sets. POWER: SC and SC-1 require primary power of 1500 watts at 115 volts, 60 cycles. SC-2 and SC-3 require 2500 watts at 115 volts, 60 cycles. All sets use ship's power of 115 volts, 60 cycles; transformer, if ship's power is 440 volts AC or 220 volts AC; motor generator if ship's power is DC.

*BI is a component of the Mark IV IFF system omitted from this volume.

## SK Long Wave Search Set for Large Ships

SK Installed on Battleship

DESCRIPTION AND USES: Long wave search set for large ships. Furnishes range and bearing of surface vessels and aircraft, and can be used for control of interception. Set has both "A" and PPI scopes, provisions for operating with remote PPI's and for IFF connections, and built-in BL and BI *antennas.PERFORMANCE: Reliable maximum range, with antenna at 100', is 100 miles on medium bombers at 1,000' altitude. Range accuracy is ± 100 yards. Azimuth accuracy, ± 3°. There is no elevation control, but elevation can be estimated roughly from positions of maximum, and minimum signal strength TRANSPORTABILITY: Shipment includes spares, with tubes for 400 hours, and separate generator if ship's power is DC. Not air transportable. INSTALLATION: SK has 10 components weighing approximately 5000 lbs. Heaviest unit (2400 lbs.) is the antenna assembly. Antenna measures 15' x 16'9". Antenna should be 100 ft. or more above water. PERSONNEL: Minimum operators required are one per shift. POWER: Primary power required is 3500 watts, 115 volts, 60 cycles. Source of power is ship's power of 115 volts, 60 cycles.

*BI is a component of the Mark IV IFF system omitted from this volume.

## SG Microwave Search Set for destroyers and Larger

SG on Destroyer

DESCRIPTION AND USES: Microwave search set installed on destroyers and larger ships to search for enemy surface ships, to coordinate attack by surface vessels, and to aid in navigation. Furnishes range and bearing on PPI and "A" scopes. SG has provisions for IFF (identification) connections, and equipment is being supplied for connecting to remote PPI's. PERFORMANCE: Reliable maximum range is 15 miles on large ships; with antenna height of about 100 feet. Range accuracy is ± 100 yds. Azimuth accuracy: ± 2°. TRANSPORTABILITY: Complete shipment includes spares and testing equipment, and is crated in 15 units weighing about 4289 lbs. Largest package is 13'4" x 12" x 10" and weighs 359 lbs. Heaviest package (1425 lbs.) is 28" x 41" x 80". INSTALLATION: SG has 5 components weighing approximately 2200 lbs. Heaviest unit (1180 lbs.) is the transmitter-receiver -- 73 ^{7}/8" x 34" x 22^{3}/8". Antenna, which weighs 350 lbs. with pedestal and measures 44" x 49^{1}/2" in diameter, should be mounted as high as possible, preferably more than 100 feet above water and above adjacent superstructure.PERSONNEL: One man per shift is minimum requirement. POWER: Primary power required is 115 volts, 60 cycles: 2.8 KVA. Source is ship's main line.

## SA and SA-1 Long Wave Search Sets for Destroyers

SA-1 on Mine Sweeper

DESCRIPTION AND USES: Long wave search sets. SA is installed on destroyers or vessels of similar size, SA-1 on ships lighter than destroyers. Both sets provide range and bearing on "A" scopes only; PPI's will be added later. SA has provisions for transmitting range and bearing to remote repeaters. Both sets have provisions for IFF connections, for identification of targets, and the SA also has built-in BL and BI *antennas.PERFORMANCE: For SA the estimated reliable range is 40 miles on medium bombers at 10,000', with antenna at 100'. Range accuracy is ± 100 yds. Bearing accuracy, ± 1°. For SA-1 the estimated reliable range is 25 miles on large aircraft, 8 miles on battleship. Range accuracy is ± 100 yds. Bearing accuracy is 3° to 5° on SA-1, 1° on SA (lobe switching). There is not elevation control on either set. TRANSPORTABILITY: Shipments of both sets include spares. SA is packed in 24 units, weighing when crated 3300 lbs. Largest SA package is 110" x 69" x 33 ^{1}/2", and weighs 642 lbs. SA-1 is packed in 23 units weighing when crated 2444 lbs. Largest package is 78" x 65^{1}/2" x 34^{1}/2" and weighs 338 lbs.INSTALLATION: SA has 12 components and weighs a total of approximately 1500 lbs. SA-1 has 12 components and weighs a total of approximately 900 lbs. SA antenna measures 5' x 8'8". Including pedestal, it weighs 500 lbs. SA-1 antenna measures 5' x 6', and weighs (including pedestal) 100 lbs. On both sets the antenna should be mounted as high as possible, preferably 100 feet or more above the water. PERSONNEL: For both sets a minimum of one operator per shift is required. POWER: Primary power required by SA is 1950 watts at 115 volts, 60 cycles; by SA-1, 2 KVA, 115 volts, 60 cycles.

*BI is a component of the Mark IV IFF system omitted from this volume.

## SH Microwave Search and fire Control set for Cargo ships

SH on Cargo Ship

DESCRIPTION AND USES: Microwave search and fire control set, for cargo ships and large auxiliary transports. Range and bearing are shown on a PPI scope and an "A" scope. Lobe-switching is used for fine determination of bearing. Used to detect surface vessels, to aid navigation, and to direct gunfire. PERFORMANCE: With antenna at 100', SH has an estimated reliable range of 10 miles on large ships. Range accuracy is ± (15 yds. + 1% of measured range). Bearing accuracy is ± 1°. TRANSPORTABILITY: SH is packed in 16 units for shipment, including spares. Total crated weight is 4468 lbs. Largest package is 44" x 43" x 61" and weighs 910 lbs. INSTALLATION: Set has 9 components, weighing a total of approximately 2770 lbs. Antenna, which weighs 700 lbs. and measures 51" x 36 ^{1}/2" in diameter, should be mounted as high as possible.PERSONNEL: One operator per shift is required for each set. POWER: Power required is 2.3 KVA, 115 V., 60 cycles. A transformer is supplied for operation from 440-volt supply.

## SF Microwave Search Set for Destroyer Escorts and Lighter

SF on PC

DESCRIPTION AND USES: Microwave set installed on destroyer escorts and lighter vessels for surface vessel search, navigation, and fire control. Provides range and true bearing on "A" and PPI scopes. Beginning with serial No. 525, sets will also be equipped for remote PPI's. There are provisions for IFF connections for identification of targets. PERFORMANCE: estimated reliable range is 15 miles on large ship, with antenna height of about 100 ft. Range accuracy is ± (1% + 100 yds.) Azimuth accuracy is ± 2°. TRANSPORTABILITY: Shipment includes spares for approximately 1500 hours. Complete shipment is packed in 13 boxes (including spare parts), the largest of which is 33" x 35" x 42". When crated, the shipment weighs 2200-2300 lbs. INSTALLATION: SF has 10 components, weighing a total of approximately 900 lbs. Heaviest unit (300 lbs.) is the motor generator--16 ^{1}/4" x 40^{1}/4" x 13^{1}/2". Antenna, which weighs 125 lbs. and measures 36^{1}/4" high by 30^{3}/4" in diameter, should be mounted as high as possible, with transmission line not exceeding 50 ft. in length.PERSONNEL: Minimum operating personnel required: one per shift. POWER: Primary power required is less than 2 KW. Source of power is 400 cycle, 115 volt DC motor generator and 440 V 3 phase AC motor. Generator is supplied with set.

## SE Microwave Search Set for small Ships

SE on Small Auxiliary

DESCRIPTION AND USES: Microwave search set, installed on small vessels and cargo ships, and used to detect surface vessels and aid in navigation. Set is equipped with an "A" scope, and has provisions for IFF (identification) connections. PERFORMANCE: SE, with antenna height of 100' has estimated reliable ranges of 12 miles on large ships, 8 miles on destroyers, and 4 miles on surfaced submarines. Range accuracy is ± 100 yds. + 15 of range. Azimuth accuracy is ± 2°. TRANSPORTABILITY: Packed in 19 units for shipment, weighing a total of 3300 lbs. Largest package is 55" x 42" x 64" and weighs 510 lbs. INSTALLATION: Set consists of 8 components weighing a total of approximately 2770 lbs. Antenna assembly weighs 280 lbs., and measures 58 ^{1}/2" x 48^{3}/4" x 26^{1}/2". It should be installed as high as possible on the ship.PERSONNEL: One operator per shift is required. POWER: Required power of 2.1 KVA is provided by motor generator, supplied from ship's power of 32 V. DC or 115 V. DC.

## SL Microwave Search Set for Small Ships

SL on Light Mine Layer

DESCRIPTION AND USES: Microwave search set for small ships. Furnishes range and true bearing of surface vessels on PPI scope. The set has provisions for IFF connections. PERFORMANCE: Estimated reliable range, with antenna at 100', is 20 miles on large ships. Range accuracy is ± 25 yards or 5% of full scale. Azimuth accuracy, ± 2°. TRANSPORTABILITY: Complete shipment, including spares and testing equipment, is packed in 11 units weighing a total of 2972 lbs. Largest package is 57" x 57" x 55" and weighs 600 lbs. Heaviest package weighs 862 lbs. INSTALLATION: SL has 3 components weighing a total of approximately 1300 lbs., plus power conversion equipment if needed. Antenna, which weighs 300 lbs. with hood and measures 45" x 48" in diameter, should be mounted as high as possible above water. PERSONNEL: Minimum operating personnel required is one man per shift. POWER: Power required is 1.4 kW, 115 V. 60 cycles.

## SD-A, SD-1, SD-2, and SD-3 Long Wave Search for Submarines

SD-2 on Submarine

DESCRIPTION AND USES: Long-wave aircraft warning sets. SD-a, SD-1, and SD-2 are installed on submarines and give range only. SD-3, for small auxiliaries, supplies range and bearing. All sets are equipped with "A" scopes, and have provisions for IFF (identification) connections. PERFORMANCE: SD-a, SD-1 and SD-2, with antenna at 40' above water, have a reliable maximum range of 15 miles on medium bombers at 10,000' altitude. SD-3, with antenna at 80 ft. has a reliable maximum range of 25 miles on a medium bomber at 10,000'. Range accuracy is ± 500 yards. Bearing accuracy of SD-3 is ± 10°. TRANSPORTABILITY: There is no standard packing procedure for SD-a. SD-1 is packed in 20 units, SD-2 in 17, and SD-3 in 23. The heaviest package for each of these sets is 417 lbs. When crated SD-1 weighs 2036 lbs; SD-2, 1318 lbs; SD-3, 2548 lbs. INSTALLATION: The number of components and approximate total weight of each set are: SD-a -- 8 units, 500 lbs; SD-1 -- 6 units, 800 lbs; SD-2 -- 8 units, 550 lbs; SD-3 -- 9 units, 700 lbs. In each set the transmitter is the heaviest unit, weighing 300 lbs. Antenna assembly of SD-a, SD-1 and SD-2 weighs 34 lbs; of SD-3, 78 lbs. They should be mounted as high as possible above the water. PERSONNEL: Each set requires one operator per shift. POWER: For SD-a, SD-1, and SD-2, the primary power required is 115 volts, 60 cycles, 1130 watts. SD-3 requires 1277 watts.

## SJ Microwave Search and Torpedo Control for Submarines

SJ on Submarine

DESCRIPTION AND USES: Microwave search and torpedo-control set for submarines only. Present sets have an "A" scope only and use lobe-switching for fine determination of bearing. Later sets will also be equipped with PPI scopes. Set has provisions for IFF connections. For torpedo launching, Mark 1, 2, or 3 torpedo data computer is used. PERFORMANCE: Reliable maximum range, with antenna at 33', is 5 miles on a medium ship. Range accuracy, ± (15 yards + 0.1%). Azimuth accuracy, ± ^{1}/4°.TRANSPORTABILITY: Complete shipment includes spares for 80 days, is packed in 22 units, and weighs when crated a total of 3022 lbs. Largest package is 50" x 20" x 20", and weighs 507 lbs. INSTALLATION: SJ has 14 components weighing a total of 1850 lbs. Motor generator is heaviest unit - 440 lbs., 14 ^{5}/8" x 42^{1}/42" x 13^{7}/16". Antenna, which weighs 35 lbs. and measures 21^{1}/2" x 30" x 19^{5}/8", should be mounted as high as possible.PERSONNEL: Minimum operating personnel: one per shift. POWER: Primary power required is 1.5 KVA, 115 volts, 60 cycles. Motor generator is supplied with set, if ship's power is not suitable.

## SO Series Microwave Search and Torpedo Control for Small Craft

SO on PT Boat

DESCRIPTION AND USES: Microwave search set and torpedo control for small craft. SO and SO-3 are installed on PT boats; SO-1, SO-2, and SO-4, on escort and patrol vessels. An SO-7M, to be mounted in a one-ton reconnaissance car, is contemplated for Marine Corps use. Sets provide range and bearing of planes and surface vessels on a PPI scope. All later sets will work with gyro-compass repeaters and show true bearing indication on the PPI. There are provisions for IFF identification connections. PERFORMANCE: Estimated range with antenna at 15' is 8 miles on a large ship. Range accuracy is ± 500 yards. Azimuth accuracy is ± 4°. TRANSPORTABILITY: Complete shipment is packed in 7 units, and with crating weighs 1161 lbs. Largest package is 114 ^{1}/2" x 38" x 24" and weighs 420 lbs; but tripod can be shipped without packaging box when air transport is necessary, thus reducing the weight from 420 lbs. to 165 lbs.INSTALLATION: SO has 8 components weighing approximately 375 lbs. Heaviest unit is the motor alternator and modulator assembly -- 15 ^{1}/2" x 14^{1}/2" x 24^{1}/2" -- with a weight of 93 lbs. Antenna assembly, which weighs 59 lbs., should be 15 ft. above water, preferably higher.PERSONNEL: Minimum operating personnel: one per shift. POWER: Required power of 400 cycle 115 volts is supplied by motor generator, furnished with set. Different models of SO are supplied with motor generators suitable for various ships' power.

## SN and

*SQ Portable Microwave Sets

SQ Used as Navigating Aid in Landing Operations

DESCRIPTION AND USES: Portable microwave set, used as standby equipment for short-range search and as a navigational aid. Sets can be stowed on ships below armor and set up on deck when other radars have been damaged, or can be set up on landing barges, or carried short distances by hand for use on beaches. Both sets provide range and bearing, and SQ has provisions for IFF identification connections. SN has an "A" scope only; SQ presents "B", B and PPI indication, as desired, on a single scope. PERFORMANCE: With antenna at 20', estimated reliable range of SN is 5 miles on a large ship; of SQ, 6 miles. Range accuracy is ± (2% plus 150 yards). Azimuth accuracy, ± 3°. TRANSPORTABILITY: Shipment includes spares and is air transportable. SN when crated has 5 packages and weighs 726 lbs., the heaviest package weighing 231 lbs. and the largest package being 33" x 26" x 39". The total weight of SQ when crated will be about 100 lbs. heavier than SN. INSTALLATION: Without motor drive (approx. 100 lbs.) and spare parts (approx. 85 lbs.) SN weighs about 265 lbs. and SQ weighs about 350. Heaviest SN unit is the modulator-rectifier-indicator -- 18" x 17" x 23 ^{1}/2" with a weight of 153 lbs. Heaviest SQ component is modulator-rectifier-indicator -- 22" x 20" x 21" with weight of 170 lbs. The sets should be as high as possible above water.PERSONNEL: For both sets the minimum personnel required is one per shift. POWER: SN requires 300 W at 90-130 V, 60 cycles. SQ requires 350 W at 90-130 V, 60 cycles. Generators may be supplied if needed.

*Available for issue in latter part of 1943.

*SW Portable Medium Wave Set

DESCRIPTION AND USES: Portable medium wave aircraft detector used by Naval and Marine Corps aircraft and amphibious forces as a pack set for "jiggers" operation -- advanced bases, isolated troop concentrations, small military installations. Range and bearing are supplied with "A" type indication. PERFORMANCE: Estimated reliable range with antenna 10' above ground is 40 miles on a medium bomber at 1,000'. Bearing accuracy is approximately 10°. TRANSPORTABILITY: Shipment includes generator and spares for maintenance in the field. When crated in 6 packages the complete set weighs less than 500 lbs. The largest package weighs 72 lbs. and is 1 ^{1}/2' x 6' x 1'.INSTALLATION: Site should be elevated, but this requirement is not critical. Station can be constructed in 10 minutes by 4 men. The set has 6 components weighing a total of 300 lbs. PERSONNEL: 6 men are recommended personnel for 24-hour operation and maintenance. POWER: Primary power of 500 watts, 115 V., 400 cycles is supplies by a gasoline-driven motor generator requiring 100 octane or ordinary auto fuel.

*SB Portable Medium Wave Set

DESCRIPTION AND USES: Medium wave portable search set for detection of planes and surface vessels at advanced bases. Set provides range and bearing, and is equipped with an "A" scope. PERFORMANCE: Reliable range is not known. Range accuracy is 1,000 yards. Azimuth accuracy about ± 5°. TRANSPORTABILITY: Complete shipment, including antenna, is packed in 3 units and weighs 672 lbs. Largest package is 56" x 26" x 30" and weighs 251 lbs. INSTALLATION: Set has 3 components weighing a total of approximately 500 lbs., and can be installed in a tent in 30 minutes. Antenna height is 13' above ground. Heaviest unit (177 lbs.) is carrying case for transmitter -- 27 ^{5}/32" x 17^{15}/32" x 33^{1}/16PERSONNEL: Two operators per set are minimum requirement. POWER: Primary power required is 1.5 KVA, 800 cycles, 115 volts. Power source is gasoline-driven generator, supplied with set.

*Available for issue in latter part of 1943.

[B L A N K]

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