AS-505/GR & ( )
Description
ANTENNA: AN Antenna AS-505/GR & ( ); vertically stacked array; for transmitting receiving;
aluminum, olive drab paint finish; sectionalized, array consisting of 4 squirrel cage
antennas; dimen 18” diam X 12 ft Ig; 4 sections, ea 18” diam X 14” Ig; mts on Mast
AB-158/GR or on a “class 2” telephone pole; fixed; freq range 225 to 400 mc; 52-ohm
coaxial transmission line feed; special - has a gain of approx 6db, beam is tilted
upward at an angle of 6 degrees; u/w various UHF radio sets; USAF Exhibit ENG-240.
FUNCTIONAL DESCRIPTION: Transmits and receives signals from a UHF transmitter and
receiver operating over a frequency range of 225 to 400 mc.
AT-197/GR & ( )
Description
ANTENNA: AN Antenna AT-197/GR & ( ); discone type; transmitting-receiving; material
aluminum w/OD paint finish; sectionalized; dimen 10” diam for upper section, 14” diam
for lower section, 2’ high; twelve 1/4” hex rods 5” long mtd in a center support and
equally spaced radially to form the top disk having an overall dimen of 10”, the lower
element uses twelve 1/4” hex rods 12” long equally spaced radially at an angle of
30° from the center support to form an assimilated cone; has 2-1/2” diam mtg clamp
that fastens to top of various types of masts; fixed type; freq range 225-400 mc;
input impedance 52 ohms from RF transmission line; special-designed for broadband
operation over the entire freq range; p/o Radio Set AN/GRC-27, AN/GRC-28, AN/GRC-29
& Radio Receiving Set Set AN/GRR-6; Mfr & Contr Allen D. Cardwell Mfg. Corp; USAF
Exhibit WLENG-210 (in process); USAF Contract W-28-099-ac-81. FUNCTIONAL DESCRIPTION:
Omnidirectional broadband antenna for transmitting or receiving RF signals in the
225-400 mc range.
RG-17A/U
Description
Cable: R F: AN RADIO FREQUENCY CABLE RG-17A/U: coaxial; 52 ohms impedance, 29.5 mmf/ft;
max operating v 11,000 RMS; solid plain copper wire, 0.188” OD; outer cond: 0,760”
maz OD, plain copper, single braid; polyethylene dielectric, 0,680” OD: outer covering:
0.870” OD, polyvinyl employing improved non-migratory plasticizers; designed for low
temperature use; NME Spec JAN-C-17 w/exceptions. FUNCTIONAL DESCRIPTION: Large high
power low loss cable.
UG-495A/U
Description
CONNECTOR, PLUG: One round male; straight type; 2.620” X 1 5/16 OD o/a; RF Connector,
50 ohms characteristic impedance; cylindrical, silver plated brass; “Rexolite”, molded;
.960” dia; 3/4” -20 NEF -2 int thd mates with UG-60A/U; AN Plug Connector UG-495A/U.
FUNCTIONAL DESCRIPTION: Terminates Radio Frequency Cable RG-17/U or RG-18/U.
MT-686/GR
Description
RACK: AN Rack MT-686/GR; relay rack; material aluminum w/blue-gray paint finish; empty;
dimen 22” W X 20” D X 6’ H; three compartments; p/o Radio Set AN/GRC-27 and Radio
Set AN/GRC-28; USAF dwg 49C56349. FUNCTIONAL DESCRIPTION: Two racks required. One
houses Radio Receiver R-278/GR, Radio Receiver R-279/GR and Radio Set Control C-565/GR;
the other houses Radio Transmitter T-217/GR, Modulator MD-101/GR and Power Supply
PP-426/GR.
MX-1058/U & ( )
Description
SHELF, desk: AN Desk Shelf MX-1058/U & ( ); p/o Radio Set AN/GRC-27, AN/GRC-28, AN/GRC-29
and Radio Receiving Set AN/GRR-6; light weight metal; dimen 19” lg X 15” wd X 3” h
when recessed in panel, the usable desk space dimen are 16” lg x 12” wd; mounts on
front of any standard 19” relay rack, secures to rack by means of four (minimum) 12-24
screws; unit recesses into panel when not in use; Mfr & Contr Collins Radio Co; USAF
Contract AF-33 (038)-6135. FUNCTIONAL DESCRIPTION: Provides a means for mounting handsets,
headsets and microphones. Can also be used as a desk.
J-390/GR & ( )
Description
PANEL, distribution: AN Distribution Panel J-390/GR. & ( ); p/o Radio Set AN/GRC-27;
aluminum w/olive drab paint finish; input and output 115 or 230v, 50-60 cycle and
audio; dimen 19” wd X 5-1/2” h X 3” d; mts in Rack MT-686/GR; Mfr & Contr Collins
Radio Co; USAF Exhibit WLENG-234-A; USAF Contract AF 33 (038)-6135. FUNCTIONAL DESCRIPTION:
Standard 19-inch relay rack panel on which are mounted terminals for AC power, audio
and control circuits. Used as a junction for connecting AC power from the mains and
audio and control circuits from Control-Indicator C-806/GR to Radio Receiver R-278/GR
or Modulator-Power Supply MD-129/GR when these components are mounted in Rack MT-686/GR
CG-707/U (-ft.-in.) & ( )
Description
CABLE ASSEMBLY, RF: AN RF Cable Assembly CG-707/U (-ft.-in.) & ( ); uses Radio Frequency
Cable RG-8/U; length to be specified; terminates at one end in Amphenol connector
82-833 and at other end in RF Jack UG-60A/U; p/o Radio Set AN/GRC-27; Mfr & Contr
Collins Radio Co; Exhibit WLENG-234A; USAF Contract AF 33 (038)-6135. FUNCTIONAL DESCRIPTION:
Consists of a 2 ft length to be used as a flexible RF extension.
CX-1541/U (-ft.-in.)
Description
CABLE ASSEMBLY, power: AN Power Cable Assembly CZ-1541/U (-ft.-in.); uses Underwriters
type SO cables, two No. 14 AWG stranded cond, ea cond 41 strands No. 30 AWG has copper
wire twisted together for flexibility, 400v working; length to be specified; terminates
at one end in plug AN-3106A-18-3S, clamp AN-3057-8, and adapter AN-3055-18-8 and at
other end in solder lugs; p/o Radio Set AN/GRC-27; Mfr & Contr Collins Radio Co; USAF
Exhibit WLENG-234-A; USAF Contract AF 33 (038)-6135. FUNCTIONAL DESCRIPTION: Connects
Radio Receiver R-278/GR and Modulator-Power Supply MD-129/GR to Distribution Panel
J-390/GR.
CG-693/U (-ft.-in.)
Description
CABLE ASSEMBLY, RF: AN RF Cable Assembly CG-693/U (-ft.-in.); uses Radio Frequency
Cable RG-8/U; length to be specified; terminates at one end in Plug AN3108B-18-16S
and other end in AN 3108B-18-16P, ea end has clamps AN3057-6 and adapter AN3055-18-6;
p/o Radio Set AN/GRC-27; Mfr & Contr Collins Radio Co; USAF Exhibit WLENG-210A and
WLENG-234-A; USAF Contract AF33 (038)-6135. FUNCTIONAL DESCRIPTION: Connects Modulator
Power Supply MD-129/GR to Radio Transmitter T-217/GR.
CX-2017/U (-ft.-in.)
Description
CABLE ASSEMBLY, POWER, ELECTRICAL: Okonite type cable, 14 ea conductors, stranded,
(2 ea No. 12 AWG, 12 ea No. 16 AWG), individual insulation is rubber, rubber outer
jacket; shield around all conductors, tinned copper braid; length to be specified,
terminated at one end with 1 ea Connector, Receptacle AN3108B-36-1S, other end 1 ea
Connector, Plug AN3108B-36-1P, with 1 ea Clamp AN3057-12 on each end; Radio Receptor
Co., Brooklyn, N.Y., USAF Contract AF33 (038)-12792; USAF Exhibit ENG-246; u/w Transmitter
T-282/GR and Modulator-Power Supply MD-141/GR. FUNCTIONAL DESCRIPTION: A 4 ft length
is used to connect Transmitter T-282/GR to Modulator-Power Supply MD-141/GR.
T-282/GR & ( )
Description
TRANSMITTER, RADIO: AN Radio Transmitter T-282/GR & ( ); AM type transmission; freq
range 225 to 400 mc, single channel; power output: 100 w nominal; input: 115 v p/m
10 v, 230 v p/m 20 v, 50-60 cyc; rack mtd; dimen: 21” lg X 19” wd X 12-1/4” h, weigh
175 lb; crystal controlled, amplitude modulated class “C” final power amplifier stag
p/o Radio Transmitting Set AN/GRT-3; Mfr & Contr Radio Receptor Co; USAF Exhibit ENG-246;
USAF Contract AF-33 (038)-12792. FUNCTIONAL DESCRIPTION: This unit together with Modulator-Power
Supply MD-141/GR form a complete single channel radio transmitter. Separate crystals
are required for each frequency. Crystal frequency is multiplied 27 times. Approximately
100w of RF power is available from the final stage which is plate modulated from the
modulator-power supply.
MD-141/GR & ( )
Description
MODULATOR-POWER SUPPLY: AN Modulator-Power Supply MD-141/GR & ( ): voice type modulator,
electronic type modulator; modulator audio output: 60w, a audio freq response 200-20,000
cyc p/m 4db; power supply; output 750v at 900 ma, full wave rectification, LC filter
incl; modulator input impedance 500 ohms, output impedance 5,000 ohms (to match class
“C” RF power output stage of Radio Transmitter T-282/GR modulator input power rating
to speech amplifier-45dbm (500 ohm at 0.001 w) filament power 6.3 v at 4 amp plate
power 550 v at 250 ma, output power rating 60w; power supply input; 115 v or 230 v,
50-60 cyc, single ph, 1700 w peak, 800 w nominal dimen: 21” lg X 19” wd X 12-1/4”
h, weighs 200 lb; p/o Radio Transmitting Set AN/GRT-3; Mfr & Contr Radio Receptor;
USAF Exhibit ENG-246; USAF Contract AF-33 (038)12792. FUNCTIONAL DESCRIPTION: Amplifies
audio frequency signals from a low impedance microphone to modulate the class “C”
RF power amplifier in Radio Transmitter R-282/GR, rectifies the primary supply voltage
and filters same to supply the high voltage required for use with RF oscillators,
multipliers and power amplifier stages of Radio Transmitter T-282/GR.
R-361/GR & ( )
Description
RECEIVER, radio: AN Radio Receiver R-361/GR & ( ); AM type signal; for communications;
freq range 225 to 400 mc, for nominal 100 kc channel spacing; input 115 v p/m 10v,
230v p/m 20v, 50-60 cyc, single ph, 150w; rack mt; dimen 19” lg X 15” wd X 1-1 /2”
h approx; 20 tube superheterodyne ckt; special - noise limiter, squelch operation,
crystal controlled; u/w various UHF radio sets; USAF Exhibit ENG-245. FUNCTIONAL DESCRIPTION:
Crystal-controlled, amplitude modulated, superheterodyne radio receiver designed to
receive signals, emanating from equipment in aircraft, over line-of-sight paths in
the frequency range of 225 to 400 mc with an output level sufficient to operate a
loudspeaker such as used in control towers.
