SCR-129 - Aircraft Radio Compass, like SCR-84, 0.285-0.30megahertz
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-170 - DF Receiver, 1.7-3-3 Megahertz regen, five 864s,
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-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-204 - Pack Radio Set, receive 2.1-2.1 Mhz, send 2.2-3.06Mhz
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-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-8A)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-274N - 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-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 - Series of Transmitter/receivers, first FM set for Armor, 20-28 Megahertz, 25 W (BC-499 and BC-500), R/B by SCR-508, SCR-528
SCR-294 - Series of Receivers, 20-28 Megahertz FM, R/B SCR-538.Vehicular; rec only of radio set SCR-293; FM; frequency range 20.0-27.9 mc; voice only.
Power supplied by 12v vehicular batt; power requirements 4 amp at 14
v DC.
SCR-295 - Radio Set
SCR-297 - Navigation Aid, early SHORAN (Short Range Navigation), R/B AN/APN-5 and AN/CPN-2, 1943
SCR-298 - Mobile FM Radio Set, early, 30-40 Mhz, 35 W; based on Link 25-XMTR police-car set; TM 11-609
SCR-299 - Mobile HF Station, 2-8 Mhz, 350 W, R/B SCR-399 (see -399 for
components); TM 11-280 Ground mobile AM. Freq range, xmtr 2.0-8.0
mc, rec; 1.5-1.8 mc CW or voice; Transmission range 100 miles, voice
or CW, stationary or moving. Xmtr rated output 400 w CW, 300 w voice.
MO or xtal control. Power supplied by Power Unit PE-95 (p/o Trailer
K-52) and 12v storage batt or 115 v, 60 cyc AC commercial power and 2
spare 6 v storage batt in Truck K-51; power requirement: 2000 w, 115
v, 60 cyc plus 1500 ww for heater and lights. May be remotely
controlled up to a distance of 1 mile using 2 Telephone EE-8-() and
Wire W-110-B, supplied. Remote equip provides for remotely keying or
voice modulating the xmtr, remotely listening to the rec, and for
communicating w/operator of the radio station who assists in the
foregoing operations. Entire unit comes in Truck K-51 except Power
Unit PE-95 which is p/o Trailer K-52. Frequency Conversion Kit
MC-503 gives coverage down to 1 mc. Frequency Conversion Kit MC-516
gives coverage to 12 mc, and Frequency Conversion Kit MC-517 gives
coverage to 18.0 mc. Rec uses 9 ft whip ant and xmtr uses 15 ft whip
ant while moving; may use 21 ft whip ant while stationary or 45 ft
auxiliary wire ant for 2.0 to 4.5 mc.
SCR-300 - Radio Set, Backpack, Motorola (BC-1000), 40-48 Mhz, FM, 2W, TM
11-242, 1945. Also see RC-291, -292, -296. Pack designed primarily
for "back-pack" or "on-gnd" operation. FM; freq range 40-48 mc;
voice only; transmission range 3 miles (w/lg ant). Xmtr rated output
0.5 w. MO, xtal calibrate control. Power supplied by either Battery
BA-70 or Battery A-80; power requirements; xmtr, 0.5 amp at 4.5 v, 25
ma at 90 v and 45 ma at 150 v; rec, 0.3 amp at 4.5 v and 25 ,a at 90
v. Uses 10 ft 8" WHIP ant, or 33" whip ant end loaded. Short whip
gives less distance range than 1.2 wave whip. Antenna Equipment
RC-291 is available for use w/the set for increasing the distance
range obtained by virtue of increase in ant h; not supplied, must be
ordered separately.
SCR-399 - Mobile HF Station, 2-20 Mhz, 400 W CW, 300 W AM; (two BC-342
receivers, Hallicrafters BC-610 transmitter, BC-614 speech amplifier,
BC-939 ant. tuner, BC-1052 multimeter, RA-63 rectifier, in HO-17
shelter on 6 X 6 truck; PE-95, -197 power units in K-52 trailer).
Developed into AN/GRC-26 & AN/MRC-2. Also see SCR-299, SCR-499 TM
11-281, 1945. MC-543 provides added equipment for two-kW RITTY
operation. Gnd, mobile; set is similar to Radio Set SCR-299-C except
set is installed in Shelter HO-17 combined w/power plant normally
carried in Trailer K-52. Shelter HO-17 may be mtd on a Truck 2 1/2
Ton 6 X 6 (not supplied w/set), or on level grid for fixed operation;
xmtr freq range is 2.0-18.0 mc and may be extended down to 1.0 mc by
use of Frequency Conversion. Kit MC-509, not supplied.
SCR-474 - Receiver-Transmitter
SCR-499 - Radio Set, shelterless air-transportable version of SCR-399. Air
transportable; high power radio station similar to Radio Set SCR-399,
except no shelter or trailer provided and components are packed for
transportation by air. When installed in Truck 1/4 Ton 4 x 4,
Antenna Equipment RC-293 (end fed 3/4 wave) is supplied which
together w/Counterpoise CP-15 is used instead of the doublet kit. TM 11-281
SCR-500 - Radio Set, like SCR-510; TM 11-603
SCR-501 - DF Receiver
SCR-502 - DF Receiver, 1.5-30 Mhz (BC-1147), FTR Co., later AN/CRD-2; TM
11-256, 1945. Also see RC-223. An air-transportable gnd radio
direction finder, covering the freq range 1.5-30 mc. Used by AAF and
AGF for radio intelligence purposes and gnd aid to air navigation.
The ant system includes 2 sets of 4 equally spaced mono poles and 1
sense ant, ea connected to rotating goniometric units through RF
transmission lines. Each goniometer is connected through
transmission lines to the receiving and indicating system, which is
housed in a collapsible shelter remotely removed from the ant system,
w/provisions for switching to either any system. Instantaneous
visual bearing indication is provided on a CR oscilloscope. The
equip is essentially similar to Radio Set SCR-291-() except that an
additional ant system is employed to cover the higher freq band up to
30 mc.
SCR-503 - DF Receivers (BC-973, 0.1-3 Mhz; BC-1003, 0.1-1 Mhz); TM 11-246. Direction finding; designed to determine direction of radio xmtrs
operating within the freq of 100 kc-3000 kc which is the operating
range of this set; receives CW, tone, voice. Provided understandable
reception at the same time direction is being determined; 12 v
storage batt provides power for the equip thru Dynamotor Unit PE-133
which provided 230 v for the rec plate supply; power required 5.3 amp
at 121 DC. Uses loop ant and telescopic sense Antenna AN-45 which
extends from 16 1/2" to 9 1/2".
SCR-504 - DF Receiver 0.1-65 Mhz, BC-792; TM 11-862, -1460, 1943. Portable
radio DF; batt operated; 8 tube superheterodyne; freq range 100 kc
to 65 mc in eight bands; receives CW, tone, voice; Battery Charger
PE-128, supplied w/set, will operate from either 6 v or 12 v storage
batt. (Set is enclosed in suitcase type carrying case; uses single
turn loop ant as directional pickup and collapsible rod ant as a
non-directional pickup; has "sense" device used to determine
direction of xmtr.)
SCR-505 - Transmitter, 2-20 Mhz high-power mobile unit. See SCR-597.
SCR-506 - Vehicular Radio, GE, 2-4.5 Mhz (BC-652 receiver, BC-653 transmitter, BC-658 control box) TM 11-630, -4007, 1944. Basic 12 v unit; designed for vehicular installations for com between these vehicles and
airplanes or base stations. AM; freq range, xmtr 2.0-4.5 mc
providing 126 channels 20 kc apart, rec freq range 2.0-6.0 mc. Xmtr
rated output 80 w CW, 20 w voice. MO, xtal calibrate control; 5
preset channels one of which is tunable. Power supplied by vehicular
12 v, or 8 amp at 12 v while on standby; for rec 7 amp at 12 v. Uses
15 ft whip ant, optional in fixed location or 25 ft whip or 22 1/2 ft
aux wire ant.
SCR-508 - Vehicular Radio, WE Co., 20-28 Mhz FM (two BC-603s, BC-604, BC-605); TM 11-600, 1943. Famous "tank radio set," related to SCR-528/538,
SCR-608/ -628/-638, SCR-708/-728/-738, and SCR-808/-828. Also see RC-163.
SCR-509 - Pack radio, 20-28 Mhz FM, 1 W (80 xtals) (BC-620); TM 11-605, 1943. Also see SCR-510, -609, 610. Pack; low power; FM; freq range
20.0-27.9 mc; voice only; transmission range 5 miles. Xmtr rated
output 1.8 w. Xtal control, 2 preset channels. Power supplied for
xmtr by Battery BA-39, for rec by Battery BA-40 and BA-41; power
requirements for xmtr, 0.7 amp at 1.5 v DC, 45 ma at 90 v DC, 0.3 amp
at 7.5 v DC, 45 ma at 150 v DC; for rec 0.7 amp at 1.5 v DC and 25 ma
at 90 v DC. Uses 8 ft telescoping whip ant.
SCR-510 - Vehicular Radio, 20-28 Mhz FM, 1 W; (BC-620 transceiver, PE-97 power unit, PE-120 vibrapack, AN-45 antenna), for dry batteries, 6 V, or 12
V; TM 11-605, 1943. Also see SCR-509-609/ -610, and RC-163.
SCR-511 - Radio Set, portable "guidon" design, Motorola, 2-6 Mhz, 0.75 W
(BC-745 transceiver, -746 tuning unit, T-39 chest unit, dry
batteries); TM 11-245, 1943. Also see RC-303. Pack and vehicular.
AM; freq range 2.0-6.0 ma; voice only; transmission range 5 miles.
Xmtr rated output 0.75 w. Xtal control; 1 channel available at any
one time; freq is charged by changing tuning unit. Power is supplied by Battery BA-49, or by Battery BB-54 and Power Supply Unit PE-157;
power requirements for xmtr 490 ma at 1.5 v DC and 50 ma at 120 v DC;
for rec 355 ma at 1.5 v DC and 20 ma at 67.5 DC. Installed in
vehicle or carried as guidon by man on horseback or (using 1 dry
batt) as one man load. When used w/Power Supply Unit PE-157, the
self-contained 2 v storage batt can be exchanged from a 6 v or 12 v
storage batt.
SCR-513 - Radio Set
SCR-515 - Aircraft IFF Set, like Navy ABA and British Mark I, GE, 435-500 Mhz
(BC-645 transponder, -646 control box, -705 manual destruction
switch, -706 automatic self-destruction switch, -727
destruction-warning indicator, PE-101 dynamotor); tested with I-86
test unit); AN 08-5-50, -62, 1942. Also see RC-227.
SCR-516 - Radar, later version of SCR-268 for ground controlled interception
(few used) (BC-435, -438, -497, -612, -623, -1050); TM 11-1306,
-1506, 1944
SCR-517 - Radar, early airborne S-band (BC-781, -931, -932, -955, -992, -993, -995, BC-1101). Also see RC-227
SCR-518 - Aircraft radar altimeter, 515 Mhz (BC-688, -689, -690). R/B SCR-618 and SCR-718; AN 08-10-172, 1934. High altitude altimeter. Includes a complete set of apparatus for installation in aircraft for use in
determining the height above the terrain. The normal range of equip
is from 0 to 20,000 ft, but is operative to an altitude of approx
30,000 ft. All necessary voltages, other than pri source, are
generated within the equip. The source of power is an aircraft DC
supply of 24 to 28.6 v. Total power consumed is approximately 3000
w.
SCR-519 - Radar, 10-cm, first high-altitude bombing radar, 1942
SCR-520 - Radar, 10-cm, first airborne-intercept (BC-740 to -743, 1040, -1041, -1043 to -1045; RC-94). Also see RC-110, -225, and -253.
SCR-521 - Radar, 170-196 Mhz, based on British ASV Mark II (BC-700 to -704,
-961 (AN/TRS-1) related to Navy ASE, Also see RC-227.
SCR-522 - Famous VHF aircraft radio, 100-156 Mhz AM, four channels, 6 W, 29 V, American version of British TR-1143 made by Bendix and Colonial Radio
(BC-624 receiver; BC-625 transmitter; -602, -1175, -1176 control boxes;
-629 and -631 jack boxes; AN-104 antenna; PE-94 power unit; FT-244
rack; CS-80 case). Tested with BC-638 frequency meter, BC-1303 test
control box, IE-19 and IE-36 test sets, I-139A test meter, and I-95
field-strength meter. SCR-542 is 14-V version. TM 11-509, 1943
SCR-523 - Radar, early 10-cm airborne range finder
SCR-525 - Radar, weather-balloon DF
SCR-527 - Radar, 200-Mhz GCI, U.S. redesign of SCR-588 British system (BC-981 TO -983 AND -985 TO -989, RA-67 rectifier). GE contractor, FTR Co.
sub-contractor; TM 11-1119, -1319, -1419, -1519, 1943
SCR-528 - Tank Radio, 20-28 Mhz, 30W (BC-603 and BC-604-604); TM 11-600
SCR-529 - Radio Set
SCR-530 - Radio Set
SCR-531 - Radio Set
SCR-532 - Radar, air search and IFF, short range
SCR-533 - Radar, IFF, 500 Mhz, long range (BC-663, -665M -666)
SCR-534 - Radio Set
SCR-535 - Radar, trailer-mounted search and IFF, based on
British Mark IIG (BC-647, -648); 1942
SCR-536 - Transceiver, Motorola et al., 3.5-6 Mhz AM, 20mW
(BC-611); R/B AN/PRC-4 & 6. R/B AN/PRC-4 & 6.
Related to SCR-585; TM 11-235 , 1943. Pack; very
short range "Handie-Talkie". Self contained 2-way
set; AM; freq range 3.5-6.0 mc; voice only;
transmission range 100 ft
to 1 mile; xmtr rated output 20 mw. Xtal control; 1
channel available at a time. Power supplied by
Battery BA-37 to fil; BA-38 to plates; power
requirements, for rec 0.25 amp at 1.5 v DC, 11 ma at
103.5 v DC; for xmtr 0.3 amp at 1.5 v DC, 35 ma at 103.5 v DC. Uses
39" telescoping whip ant.
SCR-537 - Radar, 3-cm, later AN/APS-4
SCR-538 - Radio, SCR-508 with one receiver (BC-603 to -605); TM 11-600.
Vehicular; rec only of Radio Set SCR-528 plus a separate interphone
amplr. FM; freq range 20.0-27.9 mc; voice only. Operates from 12 v
vehicular batt; dyn integral w/rec and interphone amplr; power
required 8 amp at 12 v DC. Uses 9 ft whip ant.
SCR-539 - Radar Indicator, PPI, for use with SCR-270, -271 radars
SCR-540 - Radar, Airborne Interception, based on British AI Mark IV, 200 Mhz
(P-band). Also see RC-110, 225, -253.
SCR-541 - Radar, 10-cm, searchlight director
SCR-542 - Aircraft Radio, 14-V version of SCR-522 (same Bcs but PE-98 power
unit) TM 11-509, 1945. UHF command set, 100 to 156 mc, 12-14 v DC
supply. Comparable to Radio Set(SCR-522 ) which operates from
24-28 v DC supply. Xtal controlled by means of push buttons.
Includes Radio Receiver BC-624- ( ), Radio Transmitter BC-625- ( ),
Junction Box JB-29, Dynamotor Unit PE-98- ( ), Cord CD-477, Contactor
Unit BC-608 and various interconnecting plugs.
SCR-543 - Transmitter-Receiver, Hallicrafters, (BC-669); TM 11-625, 1944.
Ground, transportable and Vehicular, transportable command set for
use in vehicle or as field station. AM; freq range 1.68-4.45 mc;
voice only; transmission range 20 miles stationary, 15 miles moving.
Xmtr rated output 45 w/xtal control; 6 pre-set channels. Power
supplied by Power Unit PE-108 (including 12 v storage batt) and Power
Supply Unit PE-110; POWER REQUIREMENTS, REC 220 W, 115 V, 60 CYC OR
5.5 AMP AT 12 V dc: TRANSMITTING 550 W AT 115 V, 60 CYC AT 85% PF.
Rec may be operated from storage batt when engine gen is not
operating. Xmtr and power unit may be controlled from a distance of
18 ft w/Remore Control Unit RM-21, supplied. Uses 15 ft whip ant and
a 7 ft radial counterpoise added for non-vehicular use.
SCR-547 - Radar ("Mickey Mouse" from twin-dish antennas) (BC-941, -947, -957, MC-363 range converter, RA-58 power unit), mounted on converted
acoustic-locator trailer; TM 11-1109, 1943
SCR-548 - Radar, Harbor-Defense, 600-MHz. Related to AN/TPS-1, -2, -3. Also see SCR-648.
SCR-549 - Transmitter, TV, RCA (BC-1211, -1212, -1214), for radio control of glide bombs, later AN/AXT-2, -3; AN 08-10-234. Related to Navy ATJ.
SCR-550 - Receiver, TV, RCA (BC-1213, -1214), for radio control of glide bombs, later AN/AXR-1. Related to Navy ATK; AN 08-10-234
SCR-551 - Receiver, DF (BC-976, -978, -991); TM 11-247, 1944. Direction
finding; semi-portable; grid station direction finder of Rotating
Adcock type; operates as an aural null or as a switched car diode
type; employing CR oscillograph indicator; freq range 2.0 to 20.0 mc.
SCR-552 - Receiver, DF, 100-156 Mhz
SCR-553 - Radio Set
SCR-554 - Radio Set (BC-1005)
SCR-555 - Receiver, DF, 18-65 Mhz (BC-1005, RC-93, and PE-1554); TM 11-251, 1944. A semi-portable gnd station radio direction finder designed to
operate over a freq range of 18 to 65 mc in two bands. Visual
bearing indication is provided by means of a right-left meter
indicator. Aural-null bearing indication is also provided. Complete
assembly is demountable in sect that are pkd in chests furnished by
the mfr. Freq coverage: Band #1, 18 to 34 mc; Band #2, 34 to 65 mc.
One of the four 12 v storage batt supplied w/this equip furnishes v
for all tube heaters, dial indicator lamp, meter lamps, heater lamps,
mic and the pri of the dyn unit. High v power output as measured at
the headphone jack is 300 mw.
SCR-561 - Control-Net System for up to 4 interceptor squadrons, P/O SCR-2 (????SCS?) (BC-686 and PE-99 generator)
SCR-562 - Control-Net System (six BC-640 transmitters, 90' mast, and PE-99 generator), P/O SCS-2
SCR-563 - Control-Net System (six BC-639 rcvrs and 90' mast), P/O SCS-2
SCR-564 - Control-Net System (two BC-639 receivers), P/O SCS-2
SCR-565 - Control-Net System (two BC-639 rcvrs and PE-99), P/O SCS-2
SCR-566 - Control-Net System (SCR-522, BC-639, and PE-99), P/O SCS-2. A
portable direction finding station used to extend the range of the DF
system, or in emergencies, to perform the operations of the homer
station at a separate airfield. The mobile DF station has all major
components mtd on a Truck K-53. The station also consists of a
gasoline driven AC power unit mtd on a two-wheel trailer which is
pulled by the station truck
SCR-567 - Mobile Forward Relay Station (two BC-639 receivers, two BC-640 transmitters, two PE-99 generators)
SCR-570 - Receiver, Glide-Path, later AN/ARN-5
SCR-571 - Radio Set, with PE-99 generator
SCR-572 - Control-Net System (BC-686), P/O SCS-3; AN-08-10-40
SCR-573 - Control-Net System, 100-156 Mhz AM, 50 W (two BC-640 transmitters, PE-99 generator), P/O SCR-3. Mobile VHF radio trans station; for transmitting radio com to aircraft in flight; transmits amplitude
modulated signals over a freq band in the 100-156 mcs range;
performs the same functions as Radio Set SCR-543A but is installed
in a vehicle; p/o VHF equipment
SCR-574 - Control-Net System (two BC-639 receivers, BC-685, -686M OE-99), P/O SCR-3. VHF mobile rec stations. For receiving all radio com from
aircraft on 2 channels. Operates on amplitude modulated signals over
transmitted to operations center through Control Unit RM-18-A;
operates from Power Unit PE-99-( ) or any 115-230 v, 50-60 cyc power
supply
SCR-575 - Mobile Forward DF Station (SCR-522, BC-639, PE-99) (AN/TRD-9), P/O SCS-3
SCR-578 - Transmitter, "Gibson Girl" life-raft type, 500 KHZ CW-MCW (BC-778
transmitter plus antenna kite and balloons), R/B AN/CRT-3A; AN
08-10-94, 1943. Portable xmtr used in rubber dinghies for sea rescue
purposes; similar to the German "Not Sender NS-2." The set is
pretuned to the international distress freq 0.500 mc, modulated at
1,000 cps, and it has an oper range of 200 mi, or to aircraft at 2000
ft. The ant is of the wire type, and is raised by a balloon or kit
to 300 ft. There are two vacuum tubes in the xmtr. A built-in gen
operated by a hand crank serves as the source of power, and the power
output of the xmtr is 4.8 w. The xmtr is shaped to fit between the
knees of the operator; it is watertight and is capable of floating.
Provision is made for both automatic and manual keying. Principal
components are Radio Transmitter BC-778, Antenna Wire W-148,
Parachute M-276, Bag BG-109 and BG-110, Hand Crank GC-18, Generator
M-315 (Hydrogen) and Balloon M-278
SCR-579 - Radio Set
SCR-580 - Aircraft Radar, 10-cm, gun director for night fighters, became AN/APG-1
SCR-581 - Radar Set
SCR-582 - Radar, 10-cm harbor-defense (BC-912, -922, -926, -952 to -956); TM 11-1212, -1312, -1412, -1512, 1944. Consists of a complete set of
apparatus for gnd installation for use in locating targets on the
surface of the water, to distance as far as 90,000 yd. The set of
main components when equipped w/tubes and fuses, cable
interconnections and pri power source connections, constitutes a
complete and operative equip. The pri source of power is 60 cyc 110
v alternating cur, supplied either through commercial lines to the
installation point, or by a gasoline driven motor gen provided for
use in emergencies or in the absence of commercial power
SCR-583 - Radio Set, 2-3 Mhz, replaced SCR-203. Pack, vehicular and ground use on 2.2-4.6 Mhz, 40 W; TM 11-623, 1944
SCR-584 - Radar, famous air-defense and (later) fighter-direction, GE, 10-cm
(BC-984, -1056, -1058, -1059, -1062, -1074 to -1076, -1078, -1080,
-1085, -1059, -1062, -1074 to -1076, -1078, -1080, -1085, -1086,
-1088 to -1090, -1092 to -1094, -1096, -1130 to -1133, 1397, 1401,
MP-61 antenna pedestal, RA-71 rectifier); TM 11-1324, 1946; TM
11-1424, -1524. Related to Navy/Marines SP-1M. Also see SCR-784 and
RC-148.
SCR-585 - Radio Set, range one mile, related to SCR-536 (BC-721 Handy-talkie); AN 08-10-106, 1943. Portable; dual purpose; designed for two way conversation over distance up to one mile, receiving and transmitting
on the same freq voice only: AM; freq range 3.0 mc to 6.5 mc xtal
control. Power supplied by Battery BA-37 (1.5 v) and BA-38 (103.5
v). When installed in glider set uses Mounting FT-295-( ). When
installed on Mounting FT-292-( ), it is remotely controlled by a
pull-to-talk control Shaft MC-355 or MC-356 and Radio Control Box
BC-722-( ). For operation in the glider, headphones and throat mic
are used.
SCR-586 - Receiver-Transmitter, for radio control of target ships
SCR-587 - Receiver, first radar-countermeasures search, 38-3300 Mhz (BC-977); related to AN/APR-4 and Navy RBD; AN 08-10-137, 1943
SCR-588 - Radar, Canadian-built copy of British long-wave CHL/GCI system (Type 7 height finder) (BC-1105, -1121 to -1129); TM 11-1129, 1944
SCR-588-T1 - Radar, trainer version of SCR-588 (BC-1111, -1112); TM 11-1158, -1329, 1429, -1529
SCR-589 - Frequency Meter
SCR-590 - Radio Set
SCR-592 - Glide-Path Transmitter, 330 Mhz, later AN/CRN-2
SCR-593 - Receiver, Warning-Network (BC-728), four channels, 2-6 Mhz, powered by 2-V battery; TM 11-859, 1943. General Purpose. Pack and
vehicular; rec only; AM; freq range 2.0-6.0 mc; voice and tone only.
Four preset channels; pushbutton control. Uses storage Battery
BB-54; requires 1.85 amp at 2 v DC. Uses 7 ft telescoping whip ant.
Used by AAA for reception of alert or warning signals.
SCR-594 - Radio Set
SCR-595 - IFF Set MK III, 157-187 Mhz (I-band); AN 08-18-033, 1943. Set carried in airplanes and indicates whether a plane is friendly or enemy.
Equip may be installed on ships or land vehicles, such as trucks. In
such installations its operation is the same as for installations in
planes. The equip does not operate at fixed radio freq. Its freq is
continuously varied or swept over a range from 158 to 186 mc so that
the transponder may answer any challenging signal within this range.
The freq changes slowly from the lower limit (158 mc) to the upper
limit (186 mc) and then returns rapidly to the lower limit. About
2.9 sec are needed for this complete cyc of which 2.5 sec are taken
in sweeping slowly from the lower to upper limit. The remaining 0.4
sec is used in returning to the lower limit and is called the
"flyback time". Principal components are: Aircraft Radio Receiver,
Control Unit, Selector Unit, Antenna Assembly
SCR-596 - Radar Jammer, included AN/ARQ-15
SCR-597 - Transmitter, 2-20 Mhz, mobile high-power unit (BC-1113 to -1135,
-1139), R/B SCR-299
SCR-598 - Radar, 3-cm, coastal defense, with PPI display (later AN/MPG-1)
SCR-599 - IFF Set, portable (later AN/PPN-10, 11)
SCR-600 - Radio Set
SCR-601 - Radio Beacon, 100-156 Mhz, later AN/MRN-2
SCR-602 - Radar, portable, 212-Mhz, copy of British LW (BC-1081 to -1084,
-1284). Also see RC-192. A light-weight, portable, gnd radar
apparatus which is easily operated and completely self-contained.
Cur is supplied from its own gasoline-driven power unit. Set can be
easily assembled and disassembled. Purpose of set is to give early
warning of approaching aircraft and an approx determination of their
position. Max range of 90 miles. Unit gives close approximation to
azimuth of a target, but in determination of the altitude, rough
approximation only is obtained since this is a measurement which is
dependent upon sitting of unit and skill of operator. Approx
altitude can be determined from time of detection of target
continuously throughout time of approach.
SCR-607 - Receiver, VHF Panoramic, 28-143 Mhz (BC-787, -1032); TM 11-867. Receiving; HF com type, designed to operate from a self contained
source, 50 to 60 cyc, 110 to 115 v power supply; or from exterior "A"
and "B" batt. Includes a 3 channel U.S.F. dipole ant and a single
channel LF ant. The control box is a sw and receptacle box for
selecting a particular dipole oper in one of freq rance w/certain
directivity patterns and connecting the same to the input of the rec.
SCR-608 - Radio Set, Vehicular, 27-39 Mhz FM (two BC-683s, -684, -605).
SCR-608 - Field Artillery versions of the SCR-508 'tank radio' series. TM 11-620, 1944. Also see
SCR-808, RC-163, and RC-292. Except A. Vehicular set. FM; freq
range 27.0.38.9 mc, 120 channels 100 kc apart; voice only;
transmission range 15 miles stationary, 10 miles moving; xtmr output
30 w. Xtal control; 10 preset channels. Arranged for remote control
operation. Power is supplied by 2 v vehicular batt; power
requirements, 28 amp at 12 v DC. Can be converted to 24 v operation
by substitution of Dynamotor DM-36 for Dynamotor DM-34 in rec and
Dynamotor DM-37 for Dynamotor DM-35 in xtmr. Xmtr designed for 5
min "ON" 15 min "OFF" operation. Uses whip ant. Used for Anti-Aircraft
and Anti-Tank Warning and Control Nets; basic sect at BN Command Post
for Fire Control and Fire Direction Nets; basic sect at BN Command
Post for Fire Control and Fire Direction Nets; intra-battalion com;
installed in various vehicles.
SCR-609 - Radio, portable, Field Artillery version of SCR-509, 27-39 Mhz FM
(BC-659 and dry batteries); TM 11-615, 1943. Also see RC-63.
Receiver and xmtr; pack intended for operation on dry batt from a
stationary position. Arranged for remote control operation. FM;
freq range 27.0-38.9 mc; 120 channels, 100 kc apart; voice only;
transmission range 5 miles. Xmtr rated output 2 w. Xtal control; 2
preset channels. Power supplied by Battery BA-39, BA-40 and BA-41
(internal bias). Power required by xmtr, 0.94 amp at 1.5 v DC, 48 ma
at 90 v DC, 1.3 amp at 7.5 v DC, 59 ma at 150 v DC; by rec, 0.94 amp
at 1.5 v DC, 28 ma at 90 v DC. Uses 13 ft telescoping whip ant or 27
ft wire for emergency.
SCR-610 - Radio, pack or vehicular, Field Artillery version of SCR-510, 27-39 Mhz (BC-659 plus vibrapack); TM 11-615. Also see RC-163.
SCR-611 - Radio Set
SCR-612 - Receiver, Monitoring
SCR-613 - Receiver, Monitoring
SCR-614 - Receiver, Monitoring, 0.015-0.15 Mhz (BC-969 and RA-61A). A
radio intercept rec equip covering a freq range of 15-150 kc. Includes
Power Supply Unit RA-61 which is capable of being operated from a
100-130 v or 200-260 v, 50-60 cyc AC power source. Provision is made
so that the equip can be operated w/either a whip ant or a long
horizontal ant. Provision is also made for operation of a
loudspeaker and headphones. The loudspeakers is not p/o this
equipment.
SCR-615A - Radar, Ground-Controlled Intercept, 10-cm, 500 kW, fixed U.S.
version of British CMH height finder, range to 90 miles, for
ground-controlled interception (BC-1241 to 1252, -1279, -1365,
RC-248 antenna); TM 11-1341, -1441, -1541, 1944
SCR-616 - Receiver, Monitoring (BN-1269 and -1284); TM 11-260, 1945.
Semi-portable, HF, intercept, radio rec set for field use, covering
the freq range of 145-600 mc. The equip is capable of receiving
amplitude-modulated, freq modulated, and CW tg signals. Has output
jack arranged for connection either to std SC headsets or to a
loudspeaker, not included. Operates on 115-230 v, 50-60 cyc AC.
SCR-617 - Radar, airborne search
SCR-618 - Radar Altimeter, improved SCR-518. Not produced in quantity; R/B
SCR-619 - Radio, Vehicular, 27-39 Mhz FM (BC-1335 transceiver), later
AN/GRC-12; TM 11-619, 1944. Pack and vehicular. FM; freq range
27.0-38.9 mc; voice only. Xmtr output 1.5 w./Xtal control; 2 preset
channel. Power supplied by 3 Battery BB-54; power requirements, 5.5
amp 6 v transmitting 3.5 amp 6 v receiving. Will give about 6 hour
operation from its 6 v batt unit w/2 to 1 transmitting to receiving
radio. Uses whip ant. Can be operated while being carried in man
pack operation on pack board. Batt are rechargeable from 6 v, 12 v,
24 v DC source w/Battery Charger PE-210. Similar to Radio Set SCR-609 and Radio Set SCR-610 but smaller, lighter and more portable.
SCR-620 - Radar Beacon, responding to SCR-520 10-cm radar, later AN/CPN-3
SCR-622 - Receiver, LORAN (Long Range Navigation), later AN/APN-4, -9
SCR-623 - Radio Set
SCR-624 - Radio, 100-156 Mhz, ground-based SCR-522 (BC-624,
-625, -1171, -1314); AN 08-10-185. Air-transportable gnd station
using appropriate components from Radio Set SCR-522 ( ) and
contained in carrying case. Freq range 100-156 mc. Includes
collapsible ant mast and ant equipment; an AC rect operates from 115
to 230 v, 50 - 60 cyc to supply power for xmtr and rec components.
Provisions for complete remote operation up to distance of 500 ft.
Additional provisions for remote operation over one channel at max
distance of 2 miles and com w/monitoring operator at xmtr-rec
location.
SCR-628 - Vehicular Radio Set, Field Artillery version of the SCR-528 'tank radio' series. 27-39 Mhz FM, single-receiver version of SCR-608; TM 11-620, 1944. Also see RC-292. Basic 12 v unit. Same
characteristics as Radio Set SCR-608 (2S608/12). Issued w/same
components as Radio Set SCR-608 (2S608/12) but w/one Radio Receiver
BC-683 instead of two. Power requirements, 20 amp at 12 v DC
SCR-629 - Radio Beacon, 100-156 Mhz
SCR-630 - Radio Set
SCR-632 - Control-Net System (BC-640 transmitters, 2 PE-99's Aux Power), SCS-2 . Fixed Transmitting station for ground control of interceptor pursuit operations. Provides 5 independent channels. Uses half-wave dipoles on 90 foot steel mast. 6 xmitters BC- 640 (1 spare) Rated xmitter output 50 watts. Approx weight 22,600
SCR-633 - Control-Net System (BC-639 receivers), P/O SCS-2
SCR-634 - Direction-Finding Station (BC-639 receiver,
PE-214). An air-transportable gnd direction finding station
using components similar to those in Radio Set SCR-575. Freq range
100 to 150 mc operates from a power source of 115/230 AC, 50/60
cyc and contained in carrying case.
SCR-636 - Radar Set, 212 Mhz, similar to SCE-588 (BC-1105, -1139, -1186, -1118); TM 11-1342, -1442, -1542, 1944
SCR-637 - Forward Relay Station (two BC-639s, two -640s, two PE-99s)
SCR-638 - Field Artillery version of the SCR-538 'tank radio' series. Receiver and Intercom, 20-28 Mhz FM (BC-683, -605)
SCR-639 - Receiver, DF, later version of SCR-269, also AN/ARN-7
SCR-640 - Radar Beacon, responding to SCR-521 radar (BC-1098)
SCR-642 - Control-Net System (BC-686, PE-99), for two squadrons
SCR-643 - Control Net System (2 BC-640 transmitters, PE-99), P/O SCS-3. Two channel 50 w VHF tp and CW transmitting equipment xmtr operable simultaneously, for the gnd control of interceptor
pursuit operations. Power requirements obtained from Power Unit PE-99 ( ) or commercial 110 v AC tow wire service. Similar to Radio Set SCR-573 (except) housed in buildings not part of system.
SCR-644 - Control Net System (2 BC-639 receiver, -686, PE-99), P/O SCR-3. Rec; two channel VHF tp, 1 CW & CW receiving equipment for gnd control of interceptor pursuit operations. Power requirements obtained from Power Unit PE-99-( ) or commercial 110 v AC 2 wire system. U/w but not p/o Control Set SCR-642-( ), Radio Set SCR- 643-( ) and Radio Set SCR-645-( ).
SCR-645 - D/F Station (SCR-522, BC-639, -687, PE-100, RA-42, RC-93, -213). Fixed VHF direction finding station used for gnd control of interceptor pursuit operations. Used as direction finding station for obtaining bearing on aircraft equipped w/Radio Set SCR-522-( ), for purposes of homing and direction finding plotting. Com receiving and transmitting equipment included. Power requirements furnished by Power Unit PE-99-( ) and storage batt. Similar to Radio Set SCR-575-( ) except housed in Tower TR-17-( ) instead of vehicle.
SCR-648 - Radar, later version of SCR-548 harbor-defense system
SCR-658 - Radiosonde (RAWIN) Receiver, used AN/FMQ-1 recorder, R/B AN/CRD-1; TM 11-1158, 1945. A transportable, met balloon direction finder; used to track a radio xmtr carried aloft by a met balloon for purposes of obtaining upper wind data. Total weight, unpacked, about 1000 lbs. Freq 400 mc. Has vertically polarized dipole at array w/screen reflector. Uses lobe switching for "double tracking" in both azimuth and elevation. Can be used to obtain radiosonde type data when proper type radiosonde and recorded are used.
SCR-668 - Radar, 10-cm, Sperry search light control
SCR-678 - Radio Set
SCR-682 - Radar, transportable version of SCR-582 (BC-1192, -1194, -1223 to -1255, -1365) TM 11-1261, -1361, -1461, 1561, 1944. Also see RC-182 and -282.
SCR-690 - Radio Set
SCR-694 - Field Radio Set, 3.8-6 Mhz, 20 W CW, 7 W AM, replaced
SCR-284 - (BC-1306, PE-162 6-V/500-V gas generator or dry batteries, GN-45 or GN-58 hand generator, PE-237 vibrapack). Developed into AN/TRC-2 and AN/GRC-9; TM 11-230, -630, -694. Also see RC-302. Pack; gnd; transportable; and vehicular. For Parachute, Airborne and Mountain Troops, AM; med range. Freq range 3.8-6.5 mc; CW tone or voice; transmission range while stationary CW 30 miles, tone 20 miles, voice 15 miles; vehicular use, CW 15 miles; tone 10 miles, voice 7 miles. Xmtr output 5 w voice or tone to 20 w CW. MO xtal calibrate of choice of either of two xtal freq by means of sw selection. Power supplied by Generator (hand) GN-58 and Battery BA-48 or 6 v, or 12 v, 24 v vehicular batt w/Vibrator Power Supply
PE-237. Rec may operate approx 20 hrs on Battery BA-48. Uses whip ant and counterpoise of 1/2 wave sloping wire ant.
SCR-694 - Series of Radio Sets
SCR-695 - IFF Set, Mark III (BC-706, 765, 767, 958, 965, 966); Iband, 157-187 Mhz and G-Band, 200 Mhz. Is an airborne IFF radio equip when used in conjunction w/certain remote interrogating equip such as gnd or air-borne
interrogator-responder equip or radar equip. This set permits aircraft in which it is installed to identify itself as friendly.
SCR-696 - Receiver, used with SCR-698. Intercept station consisting of std Sig C and Commercial Equipment pkd in portable packing cases for use in tents or building for monitoring hostile broadcast programs.
SCR-697 - Radio Set
SCR-698 - Transmitter, Am band, 1kW, for propaganda broadcasting
SCR-700 - DF Receiver, 140-600 Mhz
SCR-702 - Radar, airborne fire-control, 10 cm, like AN/APG-1; developed but never used operationally
SCR-704 - Receiver, Intercept. Receiver only for reception of CW, tone or voice transmissions. Freq range 1.25-40 mc; manual control. Normally uses rhombic or double doublet ant. Used as p/o shunting Diversity equipment. Output is 8 w, 600 or 8000 ohm grounded. Power required is 180 w at 115/230 v single phase 50/60 cyc. Also used as manual receiving station. Similar to Hammerlund Super Pro rec.
SCR-708 - Radio, vehicular, 20-28 Mhz FM. "Crystal-saver" version of SCR-508; heavily redesigned internally. Also see SCR-808.
SCR-709 - Radio Set
SCR-710 - Radio, 20-28 Mhz FM. "xtal-saver" version of SCR-510 with fewer crystals
SCR-714 - Receiver, receiving portion of BC-1306, 3.8-6 Mhz
SCR-717 - Bombing Radar, 10-cm, used against surfaced submarines etc.
(BC-1007, -1091, -1093, -1095, -1142, -1148, -1150 to -1153, -1155, RC-224 or 226). Like Navy ASG. Depending on model, had B- or PPI scope; AN 08-10-173, 1943. Search type equip designed primarily for installation in aircraft for the detection of surface vessels. It operates over four ranges: 5, 20, 50, and 100 nautical miles, and over two 180° azimuth sectors (90° to the left and right of plane's centerline), fore and aft. To operate effectively, the ant equip is equipped w/a tilt, motor cocontrolled push buttons on the control box, which tilts the ant over a range from 5° above to 30° below and the plane's horizontal axis. The equip supplies both radar and beacon services and is designed to operate day and night under temp ranging from -40° to + 122°F (-40°C to + 50°C) w/relative humidities as high as 90%. Will operate satisfactorily at a max elevation of 30,000 ft above sea level. By means of oscilloscopes the apparatus provides a visual indication of the location of targets to the operator and to the pilot in terms of azimuth (in degrees, and range, in nautical miles).
SCR-718 - Radar Altimeter, 420-450 Mhz, 40,000-foot range, 400-Hz (improved SCR-618 (BC-788, I-152 indicator, AT-4/ARN-1 ant). High altitude altimeter. Is a complete equip for installation in aircraft for use in determining height above terrain. Nominal range of the equip is 0 to 40,000 ft. All necessary, other than that of the pri power source, are generated within the radio set. The pri power source should be an aircraft AC supply of 115 v +5%. The nominal freq rating of the supply should be between 400 and 2400 cps, but its actual freq may vary between 380 and 2600 cps.
Power consumption of the radio set is 135 w. Radio Set SCR-718-AM differs from Radio Set SCR-718-A in that it is slightly more sensitive. The difference is accomplished in Radio Set SCR-718-AM by ckt changes in both Radio
Receiver-Transmitter BC-788-A and Indicator I-152-A. Includes same components as Radio Set SCR-718-A.
SCR-718
SCR-720 - Radar, 10-cm replacement for SCR-520 (BC-1142, -1148, -1149, -1150, -1151). Also see RC-110, -225, -253.
SCR-721 - Radio Set
SCR-722 - Aircraft Receiver, early LORAN, 400-Hz power (BC-1182); later AN/APN-4, -9; AN 08-10-171, 1943. Used only for training.
SCR-725 - Portable radio set, walkie-talkie
SCR-726 - AN/APG-5 airborne fire-control radar
SCR-728 - Vehicular radio set, 20-28 Mhz FM. 'Crystal-saver' version of SCR-508
SCR-729 - Aircraft Radar Beacon ("Rebecca") and Air-to-Air IFF Set (BC-800, -929, -1145A, RC-55A); to 08-10-167, 1943. Similar to AN/APN-2. Complete radio rec and xmtr w/indicator on display unit. Indicator used to show signal from rec. Rec will receive on one of two pre-set freq and xmtr will transmit on one freq. Radio Set SCR-729-A is designed to operate either independently w/Indicator BC-929-A or as an aux w/display units of such radio sets as Radio Set SCR-517-B, SCR-517-C, SCR-520-A, SCR-520-B, SCR-717-A, SCR-720-A, SCR-540-A, or SCR-521-A. Components of Radio Set SCR-729-A are normally connected for 115 v AC operation. However, operation at 80 v AC has been provided for. Power for operation is normally obtained from the power supply of the radio equip w/which it is associated as an aux. If associated radio equip is not installed in particular airplane in which Radio Set SCR-729-A is used, the 115 v, 400-2400 cps is obtained from an inverter. The 24 v DC power used in operation of Indicator BC-929-A is also obtained from the airplane batt.
SCR-738 - Radio Set, vehicular, 20-28 Mhz FM. "Crystal saver" version of SCR-538
SCR-768 - Ground Radar, searchlight control
SCR-784 - Radar set, 10-cm, trailer-mounted amphibious-landing version of SCR-584 (BC-984, -1071, -1373, -1374, -1398); TM 11-1354, -1454, -1554, 1945. Also see RC-384.
SCR-802 - Radio Set
SCR-808 - Radio, Vehicular, 27-39 Mhz FM, last version of SCR-508 (BC-605, two BC-923, -924); TM 11-601, 1945. Vehicular set; FM; freq range 27.0-38.0 mc; 120 channels 100 kc apart; voice only; transmission range 15 miles stationary, 10 miles, moving. Xmtr rated output 2 w low, 35 w high. Mo, xtal calibrate; 4 preset channels. Power supplied by 12 v vehicular batt; power requirements 40 amp at 12 v; dyn are integral w/rec and xmtr. Uses whip ant. May be converted to 24 v operation by substituting Dynamotor DM-66 for Dynamotor DM-64 for rec and substituting Dynamotor DM-47 for Dynamotor DM-65 for xmtr.
SCR-810 - Radio Set
SCR-825 - Ground Radar, RAWIN, DF for weather balloons
SCR-828 - Radio Set, 27-39 Mhz, FM, one-receiver version of SCR-808; TM 11-601, 1945
