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TitleWWII Radar & Comm Equipment
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Document Text Contents
Page 1

Communications Eou Ianii:~
AUG 194

SECTION TWC

Page 2

Army Al i

Wright Field

GRAPHIC
Radio
Used

and
by the.

Service Command

Dayton, Ohio

SURVEY
Radar

Army

Equipment
Air Forces

Classification Cancelled
OR Changed to mRT DDeR SAL
Aulh: l

BY AUTHORITY OF DIRECTOR, ATSC 1 March 1945

This document. contains information affecting
the national defense of the United States within the meaning of
the Espionage Act (U.S.C. 50: 31, 32). The transmission of
this document or the revelation of its contents in any manner
to any unauthorized person is prohibited.

DISTRIBUTION RECORD OF THIS DOCUMENT IS MAINTAINED
BY: Air Technical Service Command, Wright Field, Dayton;
Att: TSERR1B

SHobart R. Yeager
;Colonel, Air C

of

Page 31

UNCLA

Recorder-Reproducer AN/GNQ-2 is ground equip-
mentwhichrecordsina similar manner as associated air-
borne recorder AN/ANQ-2. In addition, it provides play-
back by means of a pickup, amplifier and loudspeaker.

Recordings are made by embossing on a cellulose
acetate disk witha special wax surface treatment. The disk
is 0.010 inch thick by 7 inches in diameter. The disk is
drivenby an off-center pin which engages a hole in the disk
and one of a series of corresponding off-center holes inthe
turn-table. The drive pin is mounted on a spring-loaded re-
cord clamp whichholds the disk on the turn-table. The em-
bossing stylus consists of a sapphire point (tip radius
0.0015") onanaluminumalloy shank 3/4 inch long by 0.063
inch diameter. Turntable speed is 11.75 r.p.m., line spac -
ing 210 lines per inch, and recording time 30 minutes on
each side of the disk. The outer and inner groove speeds
are 4.2 inches secondand 2.1 inches second, respecitvely.

The magnetic recording head is mounted on a
short counter-balanced arm which is pivoted at its center
of gravity. The recording head arm is spring-loaded,and
the vertical force at the stylus is approximately 5 ounces.
The recording head carriage is drivenby an overhead feed
mechanism of conventional design.

The turntable is drivenby a rubber-rimmed id -
ler which engages the bottom surface of the turntable. The
idler is driven by knurled drive wheel which is driven,
through a flexible coupling, by a gear reduction box built
into the motor. The motor is a 115 volt induction motor
with a rotor speed of 1700 r.p.m.

The turntable consists of two halves joined by a
sponge rubber pad. The upper half is supported on a stain-
less steel shaft which rests in a journal assembly consis-
ting of two Oilite sleeve bearings and a single ball bear -
ing at the bottom.

The pickup is a crystal type cartridge and is
mounted on ball pivots on a carriage which is moved by a
feed screw which is out on the same shaft as the recorder
feed screw. The cartridge mounting is pivoted at its cen -

Recorder-Reproducer Lid Dynamic
Microph

RECORDER -REPRODUCER AN /GNQ- 2

SSIFIED AN/GNQ- 2

ter of gravity and spring loaded, with vertical force at the
stylus approximately 3/4 oz.

The equipment operates at a nominal voltage of
115 volts, 60 cycles per second and draws approximately
0.6 ampere when the motor is running. Standby currentis
0.3 ampere.

AN/GNQ-2A differs slightly from GNQ-2 in that
a 6V6GT tube replaces on 6SJ7GT, the radio switch is re-
moved, and includes microphone M-9/V, mounting MT -
335/V, cord CV-583/GNQ-2A and case CY-87/GNQ-2.

Test equipment require for maintenance in -
cludes general purpose testing equipment, such as multi-
meters and tube testers.

Army Supply Program requirements as of 30
November 1944 were for 96 AN/GNQ-2 for the calendar year
1945; and 270 AN/GNQ-2A for 1944 and 100 for 1945.

POWER INPUT 115 VOLTS. A.C.
FREQUENCY AUDIO
TYPE OF SIGNAL VOICE
RECORDING TIME 30 MINUTES (ONE

SIDE).
TURNTABLE SPEED 11.75 R.P.M.
FREQUENCY RES- WITHIN 3 DB & 12 DB
PONSE
SIGNAL TO NOISE 32 DB AT 1000 C.P.S.
RATIO
LINE SPACING 210 LINES PER INCH

TUBE COMPLEMENT

NO. TYPE NO. TYPE

2 6SJ7 1 6X5
1 6V6GT/G 1 NE-45 NEON

Recorder-Reproducer

TOTAL WEIGHT 7 9 LBS

Component

Recorder-Reproducer Unit
Case
Recording Disc.
Loudspeaker
Mounting
Microphone
Headset

Nomenclature

RD-5/GNQ-2
CY-87/GNQ-2
MX-119/GNQ-2
LS-107/GNQ-2
MT-279/GNQ-2
T-17
HS-33

Size

10" x 12" x 11"
12" x 12" x 13"
0.010" by 7" Diam.
3" x 6" x 9"

and includes a set of operating accessories
March 1945

Weight

27 lbs.
18 lbs.

3 lb

Page 32

UNCLASSIFIED .HEADSET S

HS-33
Headset HS-33 is a low impedance (600 ohms),

flat-response headset of the headband type primarily in-
tended for use in cabin type aircraft in conjunction with
various radio and interphone systems.' It consists of two
Receivers, ANB-H-1, Cushion M-162-A or Headset Cushion
MX-41/AR, Headband HB-7 and Plug PL-354.

Headset HS-33 and Headset HS-38 are the new
standard headsets developed for use with aircraft radio
and interphone equipment. These headsets replace Head-
sets HS-23 and HS-18. Headset HS-33 is used with Head-
band HB-7, while Headset HS-38 is for use with the Air
Corps helmet.

Superiority ,of the new headsets from the view-
point of speech intelligibility is especially evident under
high noise level conditions and at high altitudes. Carefully
controlled tests, both in flight and in the laboratory, in
which the more severe service conditions were simulated,
show increases of approximately 20 percent in the intelli-
gibility of speech heard through the equalized high-fidelity
headsets as compared to Headsets HS-23 and HS-18. Headset HS-33

Army Supply Program requirements as of 15
December 1944 were for 247,424 HS-33 for the calendar
year 1944 and 302,451 for 1945.

HS-38
Headset HS-38 is a low impedance (600 ohms),

flat response headset of the helmet type primarily intended
for use in a flyer's helmet and used in conjunction with
radio and interphone systems installed in aircraft. The
assembly consists of two Receivers ANB-H-1, two chamois
cap covers, two chamois grid covers, Plug PL-354 and
and Cap CO-328 with identification tag attached.

Headset HS-38 is the same as Headset HS-33 ex-
cept for the chamois cap covers ana the grid covers which
are securely cemented to the receivers as an aid in pre-
venting the ears from becoming frost bitten.

Headset HS-38-A is installed in Helmet A-11 and
is used with various airborne radio sets. The headset is Headset HS-38
provided with a disconnector in the cord so that in case of
a forced jump, the cord will automatically be disconnected.

Army Supply Program requirements as of 30 Nov-
ember 1944 were for 427,704 HS-38 for the calendar year
1944 and 212,997 for 1945.

March 2945

Page 61

SCR-211

Frequency Meter Set SCR-211 is designed to mea-
sure or radiate any frequency between 125 kc. and 20 mc.
It is a portable device used to adjust radio receivers and
transmitters in the field.

The instrument is completely enclosed in ablack
wrinkle-finished, aluminum-alloy cabinet. Mounted onthe
top surface of the cabinet are a carrying handle,the antenna
binding post, and a latch. On the sides are mounted two
small rings to which the carrying strap is ordinarily hooked.

The cabinet consists of three principal sections:
(1) Lower half containing the batteries or power supply,
(2) Upper half onntaining the frequency meter proper, and
(3) Small compartment at the front holding the headset when
it is not in use.

All power for the equipment is supplied by "A"
Batteries BA-23 and "B" Batteries BA-2. They are mounted
in a special tray in the lower compartment of the cabinet.

Army Supply Program requirements for all ser-
vices, as of 15 May 1944, were 25,266 for the calendar year
1944 and 16,748 for 1945

Frequency Meter BC-221-M

TUBE COMPLEMENT

NO. TYPE NO. TYPE

1 6K8 2 6SJ7

POWER INPUT POWER SUPPLIED BY
BATTERIES
125-20.000 KC
Dm-9-F (2 ea.)

Frequency Meter BC-221-J

Nomenclature

TOTAL WEIGHT 39 LBS.

Size

Frequency Meter
Crystal Unit
Calibration Book
Bag
Battery
Battery
Headset
March 1945

BC-221
DC-9-F
MC-177
BG-81-A
BA-2(12 ea., 6 in use, 6 spare)
BA-23(8 ea., 4 in use, 4 spare)
P-18 or P-20

13" x 10" x 9 1/2"

FREQUENCY METER SET SCR-211

Component Weight

17 Lbs.

--

,

Page 62

UNCLA

Frequency Meter TS-164/AR is a heterodyne
frequency meter adaptable for operation in the range from
125 to 20,000 kc. with an error of .01 percent. It includes
Frequency Meter BC-221, except thejB or Q model, a het-
erodyne oscillator, a high gain detector and an audio fre-
quency amplifier. Power is obtained from the aircraft 28
volt d. c. supply and from the high voltage dynamotor of
Radio Receiver BC-348 in the aircraft.

TS-164/AR is designed for permanent installa-
tion in the aircraft, in association with Radio Receiver
BC-348.

This equipment is similar to Frequency Meter
Set SCR-211 except that it makes provision for operation
without dry batteries and is contained in a different case,
Case CY-182/AR.

TS-164/AR is used for calibration of medium
frequency communication equipment. Principal advantages
over the standard Frequency Meter Set SCR-211 are: Elimi-

3SIFIED TS- 16 4 /AR

nation of dry batteries; reduction inweight of approximately
20 pounds.

No test equipment is required for maintenance.
This equipment had not been placed on the Army

Supply Program as of 30 November 1944.

POWER INPUT 200-250 VOLTS FROM
BC-348 28 VOLTS DC
FROM AIRCRAFT
SYSTEM

ACCURACY 101 PERCENT

TUBE COMPLEMENT

NO. TYPE NO. TYPE

2 6SJ7 1 6K8

/%

Frequency Meter TS-164/AR

FREQUENCY METER

Component

Frequency Meter
Case
Cord
Mounting

TS- 164/AR

Nomenclature

BC-221-()
CY-182/AR
CX-243/AR
MT-269/AR

Size

10" x 9" x 8"
8" x 12" x 10"
10 feet long
11" x 11"

TOTAL WEIGHT 19 LBS

Weight

8 Lbs.
6 Lbs.
1 Lb.
2 Lbs.

March 1945

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