46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78* 79 80 81 82 82B 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 107 108 109 110* 111 112 113 114 115 116 117 118 119 120 121 121A 123 124 125 126 127* 128 129 130 131 132 133 134 135 136 137 138 140 144 145 146 147 148 149 151 152 153 154 155 158 159 160 161 162 163A 167 168 170 171 172 173 174 175 176 177A 177B 178 179 180 -*-183 -*-185 -*-186 -*-187 -*-188 188A 189 192 193* 194 195 196 197* 199 200 202 203 204 206* 209* 210* 211* 213* 233 237 238 240 241* 242* 243 244* 245* 246 248 249 250 251 253 254 255 257 258 259 260* 261* 262 263 264 268* 269* 270* 271* 272 273 274N 276 277* 278 279 280 281* 282* -*-283 284* 285 286 287* 288 289 290 291 292 293*
SCR-40 Fixed Station, 3 kilowatt, "developed before 1907, obsolete since 1915"
SCR-41 Field Wireless Wagon, 1-kw quenched spark transmitter, crystal receiver, PE-27 power unit
SCR-42 Radiotelegraph Station, 1 kilowatt, 500-Hz Marconi set for Coast Artillery
SCR-43 A permanent Fixed Station radio installation comprising two 200 ft. structural-steel towers supporting a T-type antenna of 7 wires, each 280 feet long; the power equipment includes a 60 cycle, 20 horsepower induction motor driven by a gasoline engine at a speed of 1,700 rpm; the radio equipment includes a closed magnetic circuit, oil immersed transformer, a relay type key, a condenser consisting of 26 Leyden jars each of 0.002 mfd. capacity, an adjustable inductance, a spark gap and a receiving set similar to that in the field radio pack, but of a larger size.
SCR-44 Field Wireless Set, - obsolete in 1920 - A two way radio pack set; forerunner of the SCR-49.
SCR-45 Receiver, with Cohen crystal detector, National Electrical Supply Co.
SCR-46 Receiver, "Cohen Static-Coupled Receiving Set"
SCR-47 Field Radio ("wagon set"), in artillery caisson, 2 kw, range 75-800 miles.
SCR-48 Radiotelegraph, table-top, 1/4 kilowatt, like SCR-49 but with M-G set, for coast defense
SCR-49 Pack Set (BC-24), crystal receiver, 0.125-1.0 megahertz 1/4-kilowatt quenched gap transmitter, 0.73-1.0 Megahertz GN-8 hand generator
SCR-50 Radio on truck, 2-kilowatt spark xmtr, xtral or VT receiver, 0.15-0.50 Megahertz
SCR-51 Aircraft Transmitter, 500-W quenched-gap and 500-Hz win gen.
SCR-52 Aircraft Receiver, regenerative detector and one audio stage.
SCR-53 V-antenna for training, receiving & transmitting
SCR-54, 54A Receiver, Artillery-spotter (BC-14) (AR-4) Crystal detector; inductively coupled; turned primary and secondary; 150 ft. inverted L antenna; wave-length range, 200-600 meters. Equipment type A-2 Antenna, type AN-1 (1) Bag, Type BG-1 (4) Bag, type BG-2 (1) Equipment, GD-1 (2) Guy, type GY-1 (6) Guy, type GY-2 (3) Hammer, type HM-1(1) Marker, type MR-1 (1) Mast section, type MS-1 (2) Mast section, type MS-2 (8) Plate, type MP-1 (2) Plate, type MP-2 (2) Plate, type MP-3 (1) Reel, type RL-3 (4) Rope, type RP-10 (1) Stake, type GP-1 (6) Equipment type RC-1 Battery, type BA-4 (2) Contact Spring, type M-14 (3) Crystal, type DC-1 (4) Head set, type P-11 (2) Screw driver, type TL-2 (1) Set box, type BC-14 (1) Strap, type ST-5 (1) Wire, type W-20 (300 ft.) Handbook, radio pamphlet No.3.
SCR-55 Detector, One-tube (BC-19/DT-3) for SCR-54
SCR-56 Aircraft Training Transmitter, low-power R/B SCR-65
SCR-57, 57A First Aircraft Intercom (BC-10), for pilot and observer-gunner
SCR-58 Transmitter, sending unit of SCR-68
SCR-59, 59A Receiver (BC-12), receiving unit of SCR-68, U/W SCR-65 xmtr
SCR-60 Wavemeters, General Radio Co., total coverage ca. 0.15-6.0 Megahertz with A, B, C versions
SCR-61 Wave meter (BC-37), Western Electric Co. lab unit, 0.125-2.0 Megahertz
SCR-62 Observation-Balloon Radio (SCR-54 receiver plus SCR-73 xmtr)
SCR-63 Transmitter, Aircraft Radiotelegraph
SCR-64 Aircraft Transmitter, rotary gap powered by wind generator
SCR-65, 65A Aircraft Transmitter (BC-15, BC-15A), with quenched gap
SCR-66 Battery-Charging Set
SCR-67, 67A Ground Radiophone (BC-13A), receiver 500-1500, xmtr 0.67-1.2 Megahertz
SCR-68, 68A Aircraft Radiophone (BC-11), receiver 500-1600, xmtr 0.67-1.5 Megahertz
SCR-69 Aircraft CW Transmitter (BC-34), 0.20-0.50 Megahertz (one VT-12; first Signal Corp VT transmitter)
SCR-70 Receiver (BC-23), one-tube regenerative, 0.20-0.50 Megahertz
SCR-71 Ground-Return Telegraph Set (BC-16), French TPS (telegraphic par sol) type, for trench use
SCR-72, 72B Ground Telegraph Set (BC-17), SCR-71 with VT amp in receiver
SCR-73 Aircraft CW Transmitter (SCR-64) modified for 0.545-1.50 MEGAHERTZ)
SCR-74, 74A Ground Transmitter (BC-18, BC-18A ), unturned inductance
SCR-75 Aircraft Receiver-Interphone (BC-10, BC-20), 0.355-2.0 Megahertz
SCR-76, 76A Ground Telegraph (BC-21, BC-21A), combining SCR-71 and SCR-72
SCR-77 Radio Set, CW "short wave" (BC-38), VT-1 tubes
SCR-78* Tank Radiotelegraph Set (BC-39 and BC-40), 0.273-0.60 Megahertz. Transmitting and receiving for use in 6- ton tank wave length range 500 - 1,100meters;specially designed for a small antenna of about 65 micro-mfd.; capacitance ; transmitting circuit comprises four tubes, VT-2 inductively coupled for oscillation generation to the antenna circuit; receiving circuit comprises one tube, Type VT-1 used as detector and two as amplifiers; a tuning wave meter is furnished w/the set; the battery charging outfit used w/the set is furnished by the Tank Corps. Equipment, type A-7 Mast section, type MS-6 (3) Mast section, type MS-7 (3) Equipment, type PE 22 Battery, type BB-17 (12) Box, type BC-25 (1) Dynamotor, type DM-1 (1) Equipment, type RE-6A Band, type FT-11 Battery, type BA-2 (4) Battery, type BA-4 (3) Box, type BC-33 (1) Cloth, emory, 5 sheets Cord, type CD-41 (2) Cord, type CD-42 (3) Cord, type CD-44 (2) Cord, type CD-45 (2) Cord, type CD-46 (42) Cord, type CD-51 (3) Cord, type CD-52 (3) Fixture, type FT-10 (1) Head set, type P-11 (2) Key, type J-12 (2) Lamp, type LM-4 (4) Lamp, type LM-5 (4) Pad, type M-9 (6) Pliers, type TL-19 (1) Rain Shield, type M-10 (4) Screw and Washer (6) Screw eye (4) Screwdriver, type TL-21 Set box, BC-39 (1) Set box, BC-40 (1)
SCR-79 Radiotelegraph Set (BC-32), 0.273-0.60 Megahertz, 4 tubes
SCR-80 Aircraft Radiotelegraph Set (BC-52), 0.40-0.55 Megahertz; three VT-1, one VT-4
SCR-81 Triode Tube Tester (BC-41A); tests VT-1 as modulated RF osc.
SCR-82 Battery Charger, 25 & 115 V, 2 kilowatt M-G set, Dyneto Electric Co.
SCR-82B SCR-82 modified for 50 V, 2 kilowatt
SCR-83 Direction Finder (BC-42), 0.375-1.0 Megahertz, 6-ft folding loop ant.
SCR-84 Radio Compass, for Handley-Page aircraft
SCR-85 Radiotelegraph Set
SCR-86 Aircraft Radio Maintenance Set
SCR-87 Decremeter, to measure bandwidth of spark transmitters
SRC-89 Aircraft Interphone
SCR-88 Mobile Radio-repair Set
SCR-89 Interphone Set
SCR-90 Aircraft Radiotelephone
SCR-91 Aircraft Radiotelephone
SCR-92 Aircraft Transmitter
SCR-93 Aircraft Radiotelephone
SCR-94 Transmitting-Tube Tester
SCR-95 Wave meter (BC-40)
SCR-96 Radiotelegraph Set
SCR-97 Truck Radio (SE-1420 receiver, 0.038-1.5 Megahertz; transmitter 0.1-0-3 Megahertz), six pliotrans
SCR-99 Radiotelegraph Set (BC-45, BC-49), 0.16-0.33 Megahertz
SCR-100 Aircraft Transmitter (SCR-64 powered by M-G) (too late for WWI)
SCR-104 Aircraft Interphone
SCR-105 Radiotelegraph Set (BC-53)
SCR-107 Ground Telegraph
SCR-108 Radio Set, truck-mounted
SCR-109 Ground Radiotelephone, like SCR-67, limited production
SCR-110* Battery Charger, 50 V, 1.5 kilowatt; M-G set from J.L. Yarian Co.
SCR-111 Wave meter
SCR-112 Radio Set (BC-47), 500-Hz spark transmitter; loop antenna
SCR-113 Aircraft Transmitter (SCR-64 powered by M-G) (too late for WWI)
SCR-114 Aircraft Radio (BC-114), like SCR-68 but less interphone
SCR-115 Aircraft Receiver (BC-12), like SCR-59A but less interphone
SCR-116 Aircraft Radio (BC-11A), like SCR-68A but less interphone
SCR-117 Aircraft Receiver
SCR-118 RF Wire Telegraph Set, used 18-, 23-, 27-, 43-kHz tones; VT-3
SCR-119 Aircraft Direction-finding Receiver
SCR-120 Battery Changer, 125 V, 5 kilowatt M-G set
SCR-121 Audio Amplifier (BC-44A), two-stage
SCR-121A Amplifier (BC-69), like BC-121, with 5-ft loop
SCR-123 Battery-Changing Set
SCR-124 Wave meter, National Electrical Supply Co.
SCR-125 Wave meter
SCR-126 Radiotelephone Set, VT-2 and VT-3 tubes
SCR-128 Wave meter
SCR-129 Aircraft Radio Compass, like SCR-84, 0.285-0.30 megahertz
SCR-130 Pack Radio Set, like SCR-127
SCR-131 Field Receiver-Transmitter (BC-148), 4-4.36 Megahertz (orig. 0.545-1.75), powered by dry batteries and GN-35 hand generator; LP-7 loop antenna for sending and receiving; TM 11-237
SCR-132 Radio Set, CW-1M, receive 0.25-0.545 Megahertz, send 0.16-0.355 Megahertz; TM 11-233
SCR-133 Radio, Plane-to-Plane (BC-129), receive 0.25-1.75 Megahertz, send 0.86-2.0 Megahertz; ca 1925
SCR-134 Scout & Bomber Radio (BC-114), CW-AM, receive 0.25-2.0 Megahertz send 0.25-0.355 Megahertz; TM 11-201
SCR-135 Scout & Bomber Radio (BC-114), variant of SCR-134
SCR-136 Radio Set, CW-AM, for artillery fire control; also used with SCR-134; receive 0.25-1.75 Megahertz, SEND 0.33-0.86 Megahertz; TM 11-230, 1926
SCR-137 Wave meter
SCR-138 Wave meter
SCR-140 Transmitter, medium frequency, high power
SCR-146 Heterodyne Set
SCR-151 Radio Set
SCR-152 Radio Set
SCR-153 Radio Set
SCR-154 Radio Set
SCR-155 Aircraft Interphone, ca. 1925
SCR-158 Interphone Set
SCR-159 Radio Set
SCR-160 Aircraft Interphone, U/W SCR-134, ca. 1925
SCR-161 Field Receiver-transmitter (BC-151) for artillery nets, 4.37-5.1 Megahertz version of SCR-131; TM 11-237
SCR-162 Radio Set, for coast artillery, ship and shore
SCR-163A Radio, for tank & cavalry use, 2.3-2.7 Megahertz, PE-40 power unit;TM 11-236, 1940
SCR-167 Interphone Set
SCR-168 Interphone Set
SCR-169 Battery Charger PE-HH-43; TM 11-302, 1945
SCR-170 DF Receiver, 1.7-3-3 Megahertz regen, five 864s, U/W BC-164
SCR-171 Field Radio Set (BC-156), 2-3 Megahertz; powered like SCR-131 but uses wire antenna and counterpoise; TM 11-234
SCR-172 Radio Set
SCR-173 DF receiver (BC-164), used three tuners
SCR-174 Radio Set
SCR-175 Radio Set
SCR-176 Radio Set
SCR-177A Transmitter BC-191, 75W, 0-4-1.0 & & 1.5-2.5 Megahertz; BC-189 receiver. Also see RC-47
SCR-177B* Same transmitter, but with BC-312 & BC-314 receivers; TM 11-232, 1941. Ground transportable AM frequency. range for xmtr 400-800kc; 1500-1800kc for radio receiver (BC-314). 150-1500 kc for receiver BC-312 MO control; rated power output of xmtr 75 w. Power unit PE-49-C is 365 w @14.4 v DC rec 4.2 ampat 12v DC. 'use crowfoot ant 0.4 mc and 1/4 wave inverted L w/ counterpoise for 1.5 -4.5 mc. TM 11-232.
SCR-178 Field Radio Set (BC-186 receiver, BC-187 transmitter, BC-188 screen modulator), 2.4-3.7 Megahertz, powered by dry batteries and LV-HV generator; TM 11-231
SCR-179 Cavalry saddle version of SCR-178 (same Bc's); TM 11-231
SCR-180 Radio Set, BC-189
SCR-*-183 Aircraft Radio, 14-V command set, (BV-192, 199, 229, -230); receive 0.2-0.4 and 2.5-7.7 Megahertz; send 2.5-7.7 Megahertz, 3.5 W CW, designed by Aircraft Radio Corp and made by WE Co., Stromberg-Carlson, and Philico; TM 11-200, 1932 (SCR-AS-183 is in AN 8-10-158, 1943.) Also see SCR-283.
SCR-*-185 Radio Set, 1-12 Megahertz (BC-191, BC-219)
SCR-*-186 Radio Compass Unit
SCR-*-187 Aircraft Radio, 14-V liaison set (BC-224 receiver, 1.5-18MHz BC-191 transmitter, 1-12 Megahertz; CW, 75 Watts)
SCR-*-188 Ground Base (BC-191 transmitter, 1-12 Megahertz; BC-189 receiver); TM 11-233, 1942. Also see RC-47. Ground Transportable uses for gnd to gnd or gnd to air com. intended for semi-fixed uses where commercial AC is available. AM; frequency range xmtr 1.2-12.5 mc. Rec1.5-18.0 mc; CW tone, voice; transmission range CW 100 miles, tone 70 miles, voice 30 miles. Xmter rated output 75 w (less at Frequency above 8.0
MO Xmtr uses 115v or 230v 60 cyc or 200 watts , 12 v DC and 350 w 1000 v From rect; rec uses 85 w 115 v, 60 cyc. Set can be remotely controlled over 5 miles of wire W-110-B uses 1/4 or 3/4 wave inverted; L ant w/ counterpoise. TM 11-233
SCR-188A SCR-188, but with BC-312, BC-314 rcvrs & RC-47 remote control
SCR-189 Radio Set; TM 11-270, 1940
SCR-192 Transmitter (BC-192); TM 11-200, 1932
SCR-193* Vehicular Transmitter-Receiver, 12-V (BC-191 and BC-189 or BC-312, 15' whip); TM 11-273, 1941. Also see RC-47. Basic 12v unit; vehicular; for com between stationary or moving units. AM; freq range xmtr 1.5-6.2 mc, rec 1.5-18.0 mc; CW, tone or voice transmission range; stationary, CW 60 miles, tone 40 miles voice 20 miles,; moving, CW 30 miles, tone 20 miles, voice 15 miles. Xmtr rated out put 75 w. MO control Power source vehicular 12v battery; dynamoter integral w/ unit; Power requirements for xmtr 57 amp @14.2 v vehicular batt gen, rec 4.2 amp @12v DC. uses 15 ft whip antenna or 22 1/2 ft wire in semi fixed location TM 11-273
SCR-194 Radio Set (BC-222), 27-65 Mhz, first "walkie-talkie," TM 11-238. Also see RC-63.
SCR-195 Radio Set (BC-322), 53-66 Mhz version of SCR-194.
SCR-196 Frequency Meter
SCR-197* Mobile HF Station (BC-325 transmitter, 1.5-18 Mhz, 400 W; receivers: three BC-342, one Hallicrafters "Sky Champion," one BC-325; BC-119 control box; in truck-trailer combination; 45' vertical for sending, 15' whip for receiving; R/B SCR-399; TM 11-241, -805.Also see RC-47
SCR-199 Radio Set
SCR-200 Radio Set, receiver 1.5-18 Mhz, transmitter 2.2-2.6 Mhz
SCR-202 Radio Set
SCR-203 Radio Set, mule-pack, 2.1-3.1 Mhz CW-MCW-AM, 7.5 W; TM 11-239, 1941. R/B SCR-245. Pack, low power portable command set deigned to clamp on a phillips Pack Saddle. for animal pack transportation and operation. AM; freq range xmtr 2.2-3.06 mc, rec 2.1-3.1 mc. transmission range; stationary CW 30 miles, tone 20 miles, voice 5 miles. Moving CW 10 miles, tone 6 miles, voice 3 miles. Rated xmtr power output 8.5 w on CW, 7.5 w on tone or voice. MO(bias); rec power supplied by Generator (hand) GN-35 and battery BA-2 (plate) . rec power supplied by 4 battery BA-23 (filament), 4 battery BA-2(plate), and 1 Battery BA-27 (bias). uses 25 ft whip antenna.TM 11-239 Replaced by SCR-245
SCR-204 Pack Radio Set, receive 2.1-2.1 Mhz, send 2.2-3.06 Mhz
SCR-206* Receiver, portable, transmitter-locator, 0.2-18 Mhz; TM 11-240 Direction finding, receiving only; freq 200-18,000 kc. In addition, provides for conversation by telephone wires to another similar radio set for purposes of coordination when position by triangulation from which radio waves originate. such telephone comm does not include ringing feature.
SCR-209* Armored-Vehicle Radio (BC-189 or BC-312 receiver, 1.5-18 megahertz transmitter 2.2-2.6 Megahertz, 8 W, 15' whip); R/B SCR-508, SCR-528
SCR-210* Vehicular Receiver (BC-189 or BC-312 and 15' whip; TM 11-72, 1942
SCR-211* Frequency Meter (BC-221-*); TM 11-300, 1943
SCR-213 Radio Set
SCR-233 Radio Set, air-ground liaison
SCR-237 Transmitter, ten-crystal channel version of SCR-188
SCR-238 Radio Set (BC-307 transmitter, BC-224 receiver)
SCR-240 Aircraft Radio, command set, Westinghouse (BC-225, BC-338); apparently not made in quantity; R/B SCR-274N
SCR-241* Instrument Landing Navigational Aid (BC-302, BC-303 and BC-902); AN 08-10-142, 1943
SCR-242* Radio-Compass Receiver (BC-310), LF-MF, 14 V; AN 08-10-27, 194-
SCR-243 Receiver, Monitoring (BC-197), 0.10-20 Megahertz
SCR-244* Receiver, like SCR-243 (BC-779, BC-794, or BC-1004); Receiving only; CW, tone, voice; frequency range 540 kc-20 mc; normally operates from 105/125 v 50/60 cyc AC; average power consumed 180 w; will also operate from a storage batt for heater power and "B" batt for the plate and "C" bias voltages; has 600 ohm and 8000 ohm output plugs TM 11-866
SCR-245* Mobile Radio (BC-223 transmitter, BC-312 receiver, PE-125 vibrapack, 15' whip); R/B SCR-508, SCR-528; Dynamoter Unit PE-55 loud speakers LS-3 and when used in scout cars (T-7),(Cordoning equipment CB-15 TM 11-272, 1942
SCR-246 Radio-Compass Receiver, DF, LF, 12 volt
SCR-248 Radio Set
SCR-249 Radio Set
SCR-250 Radio Set
SCR-251 Blind-landing navigational system
SCR-253 Radio Set
SCR-254 Radio Set
SCR-255 DF receiver (BC-903, BC-904); Direction Finding Semi portable; gnd station; freq range 550 kc-30 mc. Operates as an aural null DF employing a rotating Adcock ant system Radio Transmitter BC-904-A as a target xmtr tower is completely enclosed by detachable panels that provide a weather proof shelter. Power is supplied by two 6v storage batteries in parallel. TM 11-861
SCR-257 Radio Set
SCR-258 Receiver, Radiosonde. See SCR-658.
SCR-259 Aircraft Liaison Radio (brief usage)
SCR-260* Radio Set (BC-348 receiver, BC-349 transmitter)
SCR-261* 28-V version of SCR-240 (BC-352 receiver, BC-353 transmitter)
SCR-262 Radio Set
SCR-263 Aircraft Liaison Radio (brief usage)
SCR-264 Aircraft Radio, 100-130 megahertz (VHF version SCR-274N), R/B SCR-522
SCR-268* Radar, first Army set, 205-Mhz searchlight director (BC-406, BC-407, BC-409, BC-412, BC-423, BC-435 to BC-438, BC-670 to BC-672, BC-968, BC-1068, BC-1070, BC-1161); tested with RC-68; TM 11-1306, -1506. Also see RC-148. Finds and tracks aerial targets by means of a radio echo. It determines the azimuth, angular elevation and altitude of the target and it transmits this information to a searchlight or a gun director. The functioning of unit remains unimpaired even though t a plane may be hidden by smoke or clouds or darkness. It is designed to search for aerial targets as far as 40,000 yd. Away. It supplies a continuous flow of data which locate aircraft positively w/ reference to the detecting unit. These data, covering azimuth, angular elevation, and altitude, are instantly available in usable form. The ability of Radio Set SCR-268 to locate aircraft depends upon the functioning of three separate ant systems each w/ directional characteristics.
By a simple mechanical system the arrays may be pointed as one unit in any desired direction. Simultaneously a powerful beam of high frequency energy from of these ant traverse back and forth over a given section of sky. Aerial targets in the field of the beam will reflect or reradiate portion of the energy back to the unit. Here, reception of the reflected signal or echo by the two remaining direction-finding ant arrays will permit further adjustment of the beam, and a close determination of the azimuth and angular elevation of the target. In addition, the time taken by a radio pulse to travel from the unit to the target and back is determined by electrical means providing in this manner a measure of the distance traveled by the pulse. This time interval is then converted by mechanical means into the slant range of the target. A mechanical computer, in turn from the slant range and angular elevation data, determines the altitude of the target.
SCR-269* Aircraft Radio Compass, 12-V, 0.20-1.75 megahertz (BC-433 receiver, BC-434 control box, PL-21 antenna, I-81 and I-82 indicators)
SCR-270* Radar, second Army set, 105 Megahertz air search, mobile, 100 kilowatts peak (BC-402 to BC-405, BC-424, BC-439, BC-758 to BC-760, BC-780, BC-785, BC-968, BC-986, BC-988, BC-1070, BC-1232, BC-1239, BC-1270, BC-1310; RD-4, RA-60 rectifier, PE-74, -138, -139 power units); TM 11-1510, -1570. Also see RC-148, -150.
SCR-271* Fixed version of SCR-270, same BC numbers, used for long range air craft detection used for air defense of U.S. coasts; TM 11-1100 (1942), -1310, -1370, -1410, -1510. Also see RC-150. operation frequency 104-112mc. pulse recurrence frequency 104-112 and 621 cps. It comprises an operation building which houses all the components, and 100 ft tower (TR- A)upon which is mounted the rotating array, ANTENNA AN-46. operates on 120/208 v 3 ph 4 wire, 60 cyc AC w/ peak power out put of approx 50 kw. SCR-272 Radio Set
SCR-273 Radio Compass (BC-413)
SCR-274 N Command Set, famous aircraft set of one to three receivers (BC-453, BC-454, BC-455, BC-942, and/or BC-946) and up to four transmitters (BC-457, BC-458, BC-459, BC-696, BC-946, BC-950, and/or BC-961), BC-456 modulator, BC-442 antenna relay control box (BC-450, BC-451, BC-461, BC-473, BC-496, OR BC-938); BC-608 timer, I-155 A test set for VHF xmtr; designed by Aircraft Radio Corp. and made by WE Co., Colonial Radio, et al; based on Navy ARA/ATA system, hence "274N"; predecessor of Navy AN/ARC-5 equipment; AN 08-10-50, 1943. Tested with IE-65, RC-54, and RC-55.
SCR-276 Radio Compass, 28-V version of SCR-246 (BC-383)
SCR-277* Transmitter, radio-range nav aid, 0.20-0.40 Megahertz (BC-467, BC-468) Mobile; trailer mounted loop type radio range homing equipment for broadcasting tone tg identification signals to aircraft fitted w/std command sets but without radio compass. frequency range 200-400 kc for transmission, 1,500- 18,000 kc for reception.
SCR-278 Radio Set
SCR-279 Radio-Compass Receiver, 14-V version of SCR-269
SCR-280 Radio Compass (BC-431)
SCR-281* Transmitter-Receiver, for harbor vessels, 1.7-2.25 megahertz (BC-441, BC-619); TM 11-244, 1945. Marine radio tp transmission and receiving for use on coastal and harbor or in land stations. operates on 4 xtal controlled frequency in the 1,700-2,750 kc band; output 25 w to ant. Power from 115 v. 60 cyc AC source. Uses but does not include single wire ant.
SCR-282* Radio Compass, 28-V version of SCR-242, AN 08-10-27, 1940
SCR-*-283 Aircraft Radio, 28-V version of SCR-183 (BC-398 control box, SCR-399 or BC-408 ant. relay, BC-429 receiver, BC-430 transmitter); TM 11-200
SCR-284* Radio Set, Crosley, 3.8-5.8 Megahertz, 25 watt CW, 12 W AM (BC-654, GN-45A hand generator, PE-103 dynamotor, PE-104 vibrapack), R/B SCR-694; TM 11-275. Also see RC-289, -290 and -302.microphone T-17 microphone t-45 Basic unit. Gnd;; vehicular pack; transportable AM; frequency range
SCR-285 Radio Set, like SCR-284 (brief use)
SCR-286 Radio Set
SCR-287* Aircraft Radio (BC-348 and BC-375), 28-V version of SCR-187
SCR-288 Receiver-Transmitter, RCA, 2.3-6.5 Megahertz (BC-474, batteries, GN-44A hand generator), R/B SCR-284 TM 11-250, 1942
SCR-289 Radar Set, improved SCR-270, SCR-271
SCR-290 Radio Set
SCR-291 Receiver, DF, 2-10 Megahertz with CRT display, made by FTR Co.; TM 11-243, 1950. Also see RC-223. Radio direction finder for the location of friendly aircraft of the pursuit or interception type. A light weight portable set including com facilities for radio and wire. 4000-8000 kc. Range 150 miles.
SCR-292 Receiver (BC-1004); TM 11-866, 1944
SCR-293* Transmitter-receiver, first FM set for Armor, 20-28 Megahertz, 25 W (BC-499 and BC-500), R/B by SCR-508, SCR-528