tm 9-1662 binaural training instruments m1 and m2 1941

8/9/2019 TM 9-1662 Binaural Training Instruments M1 and M2 1941

1/26

W A R

D

E P A R T M E N

T

9-1662

T

EC H N I C A L

MA N U A

L

j

O R D N A N C

E M A I N T E N A

N C E

B

IN A U RA

L TRA

ININ G

INSTR

U M E N T

S

M l

AND

M

2

July 8

, 1

941


2/26

T

M

9-

166

2

1-2

TE

CHN

ICAL

MAN

UAL

N

o.

9-166

2

f

W

AR D

EPA

RTM

ENT

W

ASH

IN GT

ON

July

8

1

941.

O RDN A N CE MAIN TENANCE

BIN

U

R

L

TR

IN

ING

INS

TRU

ME

NT

S

Ml

N

D

M2

P

repar

ed u

nder dir

ection

ofth

e

h

ief of Ord

nance

S

E C T I

O N I.

Gen

eral

.

P a r a

g r a p h

P

urp

ose _

— _—

— _

_——

— _

——

——

——

——

——

—

1

Scope___________-___________—————

2

R

efer

ence

s___

___

____

__—

——

—

——

——

——

—

3

II

.

D

esc

ripti

on.

G

ener

al_—

___

_ _ _

_— —

_—

— —

—

— —

— —

— —

—

4

III

. Bin

aur

al trai

ning

in

stru

men

t M

l.

Op

era

tion

_

___

__

___

__

-—

___

—

——

—

5

Ins

pec

tion

—

_

___

__

__

__ —

__

——

_—

——

6

Ma

inte

nan

ce

an

d re

pai

r---

_—

__

___

—

—

__

7

I

V.

Bi

naur

al

t

rain

ing

ins

trum

ent

M

2.

O

per

atio

n_

__

___

__

___

__

___

__

__

__

8

In

spe

ctio

n

___

__

___

__

___

___

__

__-

_—

_

9

M

ain

tena

nce a

nd

r

epa

ir_

___

__

___

__

___

_

10

V.

Car

e a

nd pres

erva

tion

.

Pro

ced

ure

-_

___

___

__

___

__

___

___

__

_

11

Page

A

P P E N

D IX

. L

ist o

f

ref

ere

nce

s__

__

___

__

___

___

__

___

2

5

S E

C T I O

N I

GE

NER

AL

P

aragr

aph

Purp

ose_

____

___

____

___

____

___

____

___

____

___

____

____

___

____

1

S

cop

e-__

___

___

___

___

___

___

___

___

___

___

___

___

___

__

2

R

efe

renc

es _

___

___

___

____

___

___

___

___

___

___

___

___

___

3

1

. Pur

pos

e.—

Thi

s m

anu

al is p

ubl

ishe

d

p

rim

arily

for

th

e in

for

mat

ion

a

nd

gu

idan

ce

of or

dnan

ce m

ain

tena

nce

p

erso

nne

l.

2.

Scope.—This manual

supplements

the

Technical Manuals which

a

re

prep

ared

fo

r t

he us

ing a

rm.

I

t

con

tains

desc

ript

ive

mat

ter an

d

i

llus

trati

ons

suff

icien

t

to

p

rovi

de a

gen

eral

w

orki

ng k

now

ledg

e of

th

e

in

stru

men

ts

a

nd

d

etai

led

instr

ucti

ons

fo

r ins

pect

ion m

ain

tena

nce

and

rep

air

by

o

rdna

nce

ma

inte

nan

ce

pe

rson

nel.

32

3248°

—41—

——1

1


3/26

T 9 1662

3 4 ORDNAN

CE DEPARTMENT

3. References.—The

appen

dix

list

s

the T

echnical Manuals and

Standa

rd Nomenc

lature

Lists for

the equipment described herein.

S ECTION

II

DESCRIPTION

Paragraph

General________

_________________________

_______

4

4.

Gen

eral.—The binaural training

instruments, Ml and M2,

are

desi

gned

as an

aid to

selecting

and training

sound-locator operators.

The operation

of these instruments is bas

ed

on the use

of phonograph

records which

closely

reproduce

the

sound

of

different

types

of

air

craft.

The

pho

tograph

tra

nscription e

quipment issued with the

Ml

instrument

is similar to the tr

anscription unit furnished with the

M

2

instrument an

d performs simila

r

functions. I

n

the

M

l

instru

ment, binaural sense

is introduced

by

a phase con

trol

unit

which di

vides and directs

the

s

ound to the

listener s

ears through

two separate

acoustic pat

hs.

In the M 2

instrument,

a

n additional fe

ature is

pro

vid

ed in that a movable sound source

may

be

employed in pl

ace

of

the

pha

se control unit to permit

training with

the

actual sound

locator under

conditions

which very

closely simulate tho

se of actual

air

craft

tracking.

This instrument include

s

the

transcription equipment, a phase

control

unit,

helmet, assembly,

and

accessories.

(1)

The source of

sound

is the tran

scr

iption equipment.

It

consists

essentially of

an

electrically driven

turntable

and

a magnetic pick-up

with

an impedance

matching net

work.

The different types

of

transcription

equipment as issued

with

instruments

of various

serial num

bers are

as

follows:

For

instruments, serial Nos. to 19, inclusive—RC

A turn

table

with uni

versal electric

motor

and

rubber-cushioned

pick-up.

. For

instruments, serial Nos. 20 t

o

25, inclusive—

Sonora

turn

tab

le

with

universal electric motor

and

Aud

ak electro-

chromatic pick

-up and arm.

For

instruments,

serial

Nos. 26

and

up—RCA

transcription

equipment,

type UZ4

21 0.

The

magnetic

pick-up, through an

impedance matching net

work,

i

s

connected

by a cord, assembly, B129354

(fig. 3), to the

receiver

and

cap, assembly

(fig. 2), of the phase con

trol unit.


4/26

TM 9 1662

BINAURAL TRAINING INSTRUMENTS, Ml AND

M2

4

(2) (fig. 1).—The mechanical

phase

shifting

is

accomplished by

the

phase control unit.

The

sound

from the

receiver

and

cap, assembly,

enters the

wye, B129350

(fig. 3),

and

branches

into two

tubes,

B129352

(fig. 3),

one

on

the right and

the

other

on the left-hand

side of

the

receiver

and cap, assembly. The sound

in each branch

proceeds

through

a slide,

C44602

(fig. 2), into a tube,

B129351

(fig. 2), and finally

into

a

rubber

tube,

A38819

(figs. 1 and

11), which connects to the

helmet of the operator.

The operator's handwheel, C44601 (fig. 2), and instructor's

handwheel, B16521 (fig.

4), are both connected

by means

of

friction

couplings

to gears

of

a

differential

which

move

the

two

slides,

C44602

(fig.

2). As

the

slides are mutually connected

through the

differential, a given movement of

one

slide is accompanied by a

corresponding movement of the

other

slide in the

opposite direction.

The motion of

the

differential arm, B129348

(fig. 2), is trans

mitted to

the

slide

by means of the link, A38803 (fig. 2), and caps,

A38805 and A38806

(fig.

3).

The pointer, A38810 (fig. 1), which is attached to the cap,

B129349 (fig.

3),

projects

through a

slot on

the

front of

the instru

ment.

A

scale

is attached

above

this

pointer

on which

the error

from the

exact

binaural balance can be read directly.

Each division

on this scale corresponds

to 3.5 mils

on a

sound

locator

having

its

horns

110 inches apart.

(3) The helmet, assembly (fig.

5),

Signal

Corps,

type HAl,

modified

for

earpiece, is

used

with this equipment.

The helmet is fitted

with two

earpieces, B129378 (fig. 5),

one

for

each

ear.

Two rubber tubes,

A38819

(fig. 11), provide the connect

ing

medium between

the

earpiece of

the

helmet

and

the

phase

control

unit.

(4)

For a

list

of

accessories refer

to Z > 3 ) below.

This instrument includes

the transcription unit,

the phase control

unit,

helmet, assembly, and

accessories.

(1) The source of sound is

the transcription

unit (fig. 6). This unit consists

essentially

of

an

electric-driven turn

table,

a magnetic pick-up, cable reel

with

cable,

and

horn, assembly.

The electric-driven

turntable

(fig.

9)

is

provided

with

a

speed

adjustment to insure

satisfactory

reproduction of

the

record. The

output level

of

the

unit

can be

varied by means of

the volume

con

trol

(fig. 7) of the amplifier.

A

cable and

receptacle, assembly, B138121 (fig. 6), provides

the electrical

connection from the

transcription

equipment

to the


5/26

TM

9 1662

4-5

ORDNANCE

DE PART M E NT

horn

(fig. 8). A reel,

C70338

(fig. 10), and crank, B138087,

are

provided

for

winding up the cable when it is not being used.

The horn,

assembly,

C70346

(fig.

6),

is

provided with

a

driver

unit and a bracket. Two pulleys are attached to the bracket to be

used for

moving the horn

along

the suspended cable or small rope.

A

compartment

is

provided

in

the assembly chest,

D29352, of

the

transcription unit to store the horn,

assembly, when it

is not being

used.

(2) The phase control

unit,

D43135

(fig.

11), and the helmet,

assembly

(D43139), for the

M2 instrument

are identical to those used

with

the Ml

instrument.

By

the installation

of

a

suitable

receiver

(par.

8


6/26

T 9 1662

BINAURAL TRAINING

IN

STRUMENTS,

Ml AND

M2

5 6

6) The instru

ctor turns his handwheel a fixed

amount and permits

the operator

to reestablish

a binaural

balance. By watching the

poin

ter on

t

he

sc

ale, A38814 (fig.

1),

the

instructor can observe the

degree of

balance

which

has

been

obtained

by

the operator.

7) By

changing the

records on the

transcri

ption unit, the listener

may

be

taught to identify

the

various types

of

aircraft by their

sound.

(1 )

Disconnect the electric

power sour

ce

fro

m the transcription equipment.

2) E

emove

th

e pick-up from the

record. Place the record

in

to

the album.

3)

Kemove

the

cord,

assembly,

B129 354 (fig.

3), from the

phase

control unit

and tr

anscription equipm

ent.

4) Rem

ove the rubber

tubes from

the

instrument and wrap them

around

the helmet.

6.

I

nspection.—Inspection is for the pu

rpose

of determining the

condition

of

the

instru

ment, wheth

er

repairs or

adjustments

are

re

quir

ed and

the

remedies

necessary to insure servicea

bility

and proper

functioning. The

following

list

will serve as a guide:

To carry

out the following

inspections the

lid,

C44604

(fig.

1),

is

removed

from the

body,

D25605.

Pointer, A38810.

(1). Examine

the

pointer

for

any

loose

ness. The screws,

BCOX3DG (fig. 3),

should

be

kept

tight

at all

times.

2

) Slides, C44602. 2

) Turn

the handwheels to

the

limit of their travel

in either

di

rection

to

see

if

the

slides

move

freely on the tubes. If tubes

show

noticeable wear or

are bent

or

dented they shou

ld

be replac

ed.

3) Friction couplings of the 3)

When either of the hand-

ha

ndwheels. wheels is

turned there should be

no slip

page

but

when stops are

encountered

the

couplings should

per

mit

slippage

to prevent

dam

age.

Slippage under normal

op

erating

conditions in

dicates

tha

t

either

adjustment or

replace

ment of parts in

the

couplings is

necessary.


7/26

TM

9 662

6 7

OR

DNANCE DE

PARTMENT

4)

Gear, A

38794, and

worm

4)

Turn

either of the t

wo

whee

l,

A

38796.

handwheel

s

slowly

in

one

d

irec

tion

and

then

in

another. By

observing

the

pointer,

A38810

fi

g. 1), on

the scale, the

back

lash

in the gears c

an be not

iced;

if ap

preciable, the

gears must

be

repla

ced.

5)

Receiver,

as

sembly. 5)

The

receiver

fig.

2)

sho

uld

fu

nction without r

attling. If it

does

not f

unction satisfa

ctorily,

replace

the

receiver.

6

) Eubber

tubes

from th

e

6

)

Examine the

rubber

tube

operator s

helmet.

for

cracks or breaks.

If

these are

no

ticed the t

ubes should be re

pla

ced.

bina

ural

trai

ning

inst

rument,

M

l, is fu

rnished with

diffe

rent types of tran

scription

eq

uipment

(par.

4

a l)

For an

in

spection of

any of th ese

types

,

th

e

following

w

ill

serve

as

a g

uide:

1)

Turntable moto

r.

1)

The motor

shoul

d

run

withou

t overhe

ating and

turn the

turntable

at

a

co

nstant speed of

78

revolution

s

per

minut

e

as

me

as

ured

by

a

suitable

speed m

easur

ing device.

If speed is

not satis

fac

tory after adj

ustment

(where it

is

provided),

the

motor

should

be

rep

laced.

2) Pi

ck-up arm.

2)

The s

ound re

produced

should

be c

lear without distortion

and

of

sufficient

intensity.

3)

C

onnecting cabl

es, plugs 3)

Examine

th

e

p

lugs and

and

ja c

ks.

jac

ks

to

see if

the cont

act

springs

make firm

contact. T

he cables

should a

lso be examined.

If the

insulation

is

badly

cra cked

or

worn,

the cables

should

be

re

placed.

7. Maint

enance and repa

ir.—The

assembled

and section

ed views

s

how

the location of the

variou

s

parts

an

d

t

he

means

by

which the

y


8/26

T

9

662

BINATJRAL TRAINI

NG INSTRUM

ENTS, l AND M2

7

are held in

place. These

figures sh

ould be

carefully

studied before a

t

tempt

ing

a

ny

a

ssembling or

disassemblin

g operation.

Fo

r the following opera

tions the lid,

C44604

(fig.

1),

is

removed

from

the

body,

D25605.

After

completion

of the

op

eration the

lid

is

to be

replaced.

(1)

(sec

.

A-A

-A-A-A-A,

fig.

2).—

Remov

e the c

ap, A38806

(fig.

3), by

removing the

two

nuts,

A35566A, an

d associated

screws.

Push the

link

, A3

8803,

awa

y

from

the

slide

and gra

sp the

slide

with one han

d and

pull

horizon

tally to the left (f

ig. 2) u

ntil

it clears

the tubes, B129352

(fig. 3). Then pull

up, thus remo

ving t

he

slide

from

the instrument.

2)

Remove the two

w

ires

fr

om the phone

jack.

T

wist

the tube, A38818 (fig.

2),

sligh

tly

and p

ull

horiz

ontally to

the left un

til

clear

of the

w

ye,

B129350

(fig.

3

), then

lift

up

on

the receiver. When

assemblin

g,

care sh

ould b

e

exercised to have

the

rubbe

r tu

be, A38818,

make a tight

c

onnection

b

etween the receiver and wye.

(3)

Remove

the

instructor handwhe

el, B16521

(sec.

G-G,

fig. 4),

to

gether with

the

adapter,

A43159,

by

removing

the

three

screws,

BCLX3DD.

Remove the fla

nge

nut,

A431

58.

by

first loosening the

ada

pter

screw, BCUX

1ED.

Extract

the flange

compressio

n

spring,

A43157. Drive out the;

flange,

taper

pin.

Extract

the

flang

e, A43155,

with plate A43156.

4)

Since the

d

isassembly oper

at

ion for the right

and left arms,

B129348

(se

c. B-B-B-B, fi

g. 2), is

simila

r, only

the procedure fo

r disassembli

ng the left

a

rm

will be

given.

Drive out the

pin,

BFCX1L

(sec.

D-D,

fig.

4),

and

push the

shaft, A3880

8

(fig. 2)

several

inches to th

e right.

Rem

ove

the

link stud, A38804 (

fig. 2), by first

removing t

he

cotter pin, B

FAXlBD, then

push the link towa

rd the

base plate

( -2).

Re

move

the

gears, A38794

(sec. E-E, f

ig .

4),

by remov

ing

th

e

two nuts, B

BAX1A, w

ith associate

d

w

ashers and d

riving

ou

t the

studs, A38795.

Remove the

four

nut

s,

A3

5566A,

and associated

washers

f

rom,

the

brackets, B129345

and

B12 9346

(sec.

B-B-B-B,

fig.

2).

Firmly

g

rasp

both

brackets

with

one hand

and with

the

other

pull toward

t

he

right

about 1 i

nch

or

enough to fre

e them

fro

m the

projecting

bolts, then

lift up vertically and

carefully

remove them from

the

instrument.


9/26

TM 9-1662

7 8 ORDNANCE

DEPARTMENT

e)

Access

can be had

for

di

sassembling the

worm

wheel

sha

ft,

A38799,

diffe

rential arm an d

associated parts if necessary.

5)

The procedure

to be followed for

reassembling

is

the

same

as for

disassembling

except

in

the

reverse

order.

Three different t

ypes

of

transcrip

tion equipment

are

is sued with this

instr

ument. No detailed

instruc

tions

relative

to

the repair and

maintenance

o

f any

one

type

are

give

n.

By

examinin

g the equipm ent,

the

procedure as

well

as

t

he screws,

nu

ts, etc ., necessary to

be removed for

the

replacement of

defective

parts can

readily be determ ined.

S E C

T I O N

IV

BINAUKAL

TRAINING INSTRUMENT,

M 2

Paragraph

O

peration______________——__—____—

__———————————

8

Inspection _________

___ — — — — _ — — _ _ — — — _

_ _ — — — — — — — — — — —

9

Maintenance and

repair__

_ _ — — — — — — — ———_ _ _ _ ——_ _ ——————

— — — - — —

10

8.

Operation.—In connection

with

the

operating procedure, ref

erence

should

be

made

to

figures

6

and

7 .

1)

Set

transcription equipment on an object of

convenient

height and open the lid of

the chest, assembly, D29358

fig. 6).

Remove the

horn, assembly, C70346 fig.

6), from

the

chest.

Suspend it from a steel cable or small

rope

which

has

previously

been strung between two poles or

trees. Plug in the cable

and

recep

tacle, assembly

,

B1381

21 fig.

6),

fro

m

the

binaural training in

stru

ment,

M2,

to the

horn,

assembly,

C70346

fig.

6).

c) Plug the cable, B138073,

into a 110-volt, 60-cycle a. c.

power

source, place

the

desire

d record on th

e turntable, and turn the

motor

swi

tch

on .

Place

a ne

edle in the pick-up

and

clam

p

it

firmly

with

the

clamp prov

ided.

Pla

ce

the pick-

up on the

record

and turn the ampli

fier switch,

on.

Set t

he

output leve

l

as

required

by

means of the volume-contr

ol

kn

ob .

/)

Place the listening station in the

immediate vicinity where

the sound

intensity

is

sufficiently

high. The

suspended

horn can be

moved to

different positions along

the cable. The listeners track the


10/26

TM

9 1662

BINAURAL TRAINING INSTRUMENTS,

Ml

AND M2 9

target with their horns and corrector operators perform

duties

exactly

as

when

tracking

an actual airplane.

(2)

Place

the

transcription

equipment

on

an

object

of

convenient

height and open the

lid of the chest,

assembly,

D29358 (fig. 6).

(&) Plug the

power

cable, B138073, into a 110-volt, 60-cycle, a. c.

power

source.

Place the desired record

on the

turntable

and

clamp

a needle into the

pick-up.

Plug the cord,

assembly,

B129354 (fig 3), into

the

output

jack

of

the transcription equipment.

Follow the

procedure given in paragraph 5a(5) to (7).

Phase control units employ different types of receivers to prop

erly

match the transcription units with

which

they

are

used.

When

first placing a phase control unit into service, it

is advisable

to verify

that the

proper

receiver has been installed. The receivers to be

used

are

as

follows:

Western Electric

Co.'s No.

528

type

rteceiver for

use with

turntables,

UZ4210 and

4814,

with AZ4211-2

pick-up.

0. Brandes Superior type receiver for turntables

other

than

UZ4210

and

4814 with AZ-4211-2 pick-up

and

Green

Flyer

turntable.

Trimm, Featherweight (24,000 ohms) receiver for

Green

Flyer

turntable for

use

with

binaural training instrument,

M2, only.

(1)

Turn the

motor and

amplifier switch

off

and

remove the

cable, B138073, from

the

power source.

(&)

Remove the

pick-up

from

the

record.

Remove

the needle from

the

needle

clamp.

)

Remove

the

record

from the turntable and

place

it

in the

album.

Remove the

horn,

assembly, from

the

suspension cable;

dis

connect the cable

and

receptacle,

assembly,

B138121 (fig. 6), and place

the horn into the

proper

place

in

the

chest.

(/) Wind up on

the

reel, C70338

(fig.

10), the cable connecting the

horn and transcription

equipment.

Close

the

lid

of the chest.

(2)

Follow the

procedure

given

in paragraph

56(1)

to

(4).

9.

Inspection.—Inspection

is

for the purpose

of

determining the

condition

of

the

instrument, whether

repairs

or adjustments are

re

quired,

and

the

remedies

necessary to insure

serviceability and

proper

823248°


11/26

T I K E 9-1663

9-11 ORDNANCE DEPARTMENT

functioning. In addition to the inspections given in paragraph

65,

the

following should also

be

made:

Volume

control.

Gradually

increase

the

vol

ume by

operating

the volume con

trol over the usable

range. The

output

of

the

horn

should increase

in uniform steps.

Scratching

or

dead spots indicate

a

defective

volume

control.

Z > . Contact springs A45869 The contact springs should

(fig.

10).

make

good

contact

on

the

rings,

A178173 and A178174,

as

the cable

reel,

C70338, is being revolved.

If the output level does not stay

constant

as

the

reel is

rotated,

the

springs

should

be

replaced.

10. Maintenance and repair.—The transcription unit furnished

with the binaural

training

instrument,

M2, will require little mainte

nance.

If

a unit fails

to function

properly

it should be

replaced.

(fig.

8).—

(1)

Dis

connect

the electrical

connections from the driver unit (fig. 8)

and

remove

the

two nuts, BBCX1C,

on

opposite

sides of the

horn.

Remove

the bracket, assembly, B138096,

from

the

horn.

(2) Pull up

on the driver

unit and

carefully

remove

it

from

the

horn.

(fig. 9).—(1) Remove the

plug from

the

input

jack. Remove the screws and clips holding the cable

and

plug,

assembly,

B138077,

to

the

turntable

plate.

(2)

Carefully

remove the pick-up by

removing

the three screws,

BCNX3DN, by

which it is secured

to the

turntable plate, C70339.

The procedure to

be

followed for re

assembling

is the

same

as

for

disassemb ling except

in

the

reverse order.

S E C T I O N V

CARE AND PRESERVATION

Paragraph

Procedure_______________________________________ 11

11. Procedure.—

(1)

The nuts and

screws holding

the

various parts of

the

phase control

unit

and

transcription

equip-

10


12/26

T

9 663

BINAURA

L TRAINING INSTRUMENT

S,

l

AND M2

ment should

be kept

tight at all times

to insure satisfac

tory ope

ration

of the e

quipment.

2) When

the transcriptio

n equipment

is

not

being used th

e

cable

and

receptacle,

assembly,

B138121

fig.

6),

should

be

disconnected

from the horn

and wound

u

p

on

the

re

el provid

ed

and

the ho

rn,

ass

embly, placed in its pro

per plac

e

in the chest.

3) Car

e should

be

exercised to keep

the connecting

cab

les an

d

ru

bber t

ubes

free f

rom oil

and

grease.

Any grease sh

ould be

r

emoved with

a

cloth moistened

with

ethyl

alcohol.

4) Car

e should be exercised w

hen plugging

in the phase

control

unit

of the binaural

training

instrument, Ml, to the

transcript

ion

equipmen

t of the M 2 instrum

ent th

at

the

plug is

p

ut

in

the output

jack shown in figure

7.

5) The

loud spea

ker cone of the

horn,

assem

bly, w

ill warp if

subjected to excessiv

e humi

dity. The equipment

should therefore

no

t

be used

in

the

rain,

and the

horn,

assembly,

should not

be

left

in the

open overnight.

6) Th

e

re

el contact rin

gs fig.

10

) sho

uld

be kept

c

lean and

free from oil at all tim

es; if neces

sary, they

sh

ould be

cleane

d with

fine flint

paper.

In

the

following procedure

when

oil

is specified,

oil, lubricating,

for airc

raft instruments an

d

ma

chine guns

U.

S. A.

Spec.

2—27

is

to

be used,

and

wher

e grease

is

specified,

grease,

special,

l

ow tempe

rature Eo

yco 6A), is to

be

used.

1)

T

he

tu

rntable

motor

must

b

e

oiled perio

dically

with

a few

drops of oil

through

the oilholes

located und

erneath the turnt

able.

2)

At freque

nt

inte

rvals

the

bearing

s of the instructor

and

oper

ator han

dwheel shafts

sho

uld

be

lubricated with a few

drops of

oil.

These

bearings are provi

ded with

oil

holes.

3)

The

gears

and

arms of

the

mechanical phase

control apparatus

should b

e periodical

ly

oiled to

insure smoo

th and qu

iet

operat

ion.

4

) The worm

wheel shafts,

A38799

and

A38800,

should

be

oiled at

frequent

interv

als.

Oilho

les are

provided

in

the s

haft

b

rackets.

B1

29345, B

129346, and B129347

fig. 2),

for this

purpose.

5) Occ

asionally

the

p

illow blocks

of

t

he cable reel, C70338

fig.

10), should be

oiled with a few

drops o

f oil

through

the

oilholes

provided

.

6

) The

s

lides,

C44602 fig. 2),

should

periodically

be

given a

light coating

of

grea

se.


13/26


14/26

TM

9-1

66S

BINATJR

AL TRAININ

G INSTRUMEN

TS, Ml

AN

D M2

11

NUT A35566A

MESHES WITH

A3B794

SECTION E E

SHAFT A38800

MESHES WITH

A3879T

SECTION

FIGURE

2.—Binaural

trai

ning instrument

Ml

or

M2—phase co

ntrol unit sectioned view

s.

See

fig. 3 for lo

cation

of

section plane

s

A-A-A-A-

A-A

and

B-B-B-B

sees. D-D, F-F

and

G-G are shown on f

ig.

4

.)

1

3


15/26

TM

9-

166

2

O

RDN

ANC

E

E

P R

TM

ENT

SECT

IO N

A -A

-A-A -A

-A - L-PI

N- B FA

XI B D B

LOCK

.A388

I6

TOR GREEN

FLYER

TU R NT

A BL E

BINA UR

M. TR A M

ING IN STRU

M EN T. »ZO

TJ

V /

®«FO

RTU»ra

BLES

OTHER

T HA N ®ANO

SE

CTIO

N C -

C

R

A F

SD

405

F

IGUR

E 2.

—Bi

miuru

l

trai

ning

ins

trum

ent

Ml

or

M2—

pha

se co

ntrol

un

it

sectio

ned

view

s— C

onti

nued

.


16/26

T 9 663

BINATJRAL TR

INING INSTRUMENTS l

AND

M2

5


17/26

T 9 1662

O

RDNANCE

DEPARTMENT

I

16


18/26

TM 9 1662

BINAURAL TRAINING

INSTRUMENTS,

Ml AND M2 11

17


19/26

TM

9 1662

ORD

NANCE DEPARTM

ENT

18


20/26

BINAURA

L

TRAINING

I

NSTRUMENT

S,

Ml

TM

9 1

663

AND M

2 11

8

HO L

ES

.136

N O .

29 DR I L L

WHEN ASSEM BL I NG .

RECEPTACLE

OU

TPUT

J ACK OUTPUT

J A C K , INPUT

GR ILLE

RA FSO 252

9

F IQHKB

7

.—Blnnural

training

instrument, M

2—amplifier, asse

mbly.

9


21/26

F

G

U

R

8

—

n

a

a

n

n

n

u

m

M

—

n

a

m

y


22/26

T

M

9-

1

6

62

B

IN

A

U

RA

L

T

R

A

IN

IN

G

IN

ST

R

U

M

E

N

TS

M

l

N

D

M

2

21


23/26

TM

9 1662

ORDN NCE

DEPARTMEN

T

cl


24/26

BINAU

RAL TRArNING

INS

TRUMENTS

TM

9 1662

Ml

AND M


25/26


26/26

TM 9

662

BINAURAL TRAINING

IN

STRUMENTS, Ml AND M2 App

APPENDIX

LI

ST OF REFERENCES

1.

Standard

Nomenclature List

s.

Instrumen

t, binaural training,

l_____ SNL

F-121.

Instrument,

binaural

train

ing, M ______

SNL

F 198

.

2.

Technical Manuals.

Cleaning and

preserving

materials_______

TM

9-850

now

pub

lish

ed

as

TR

1395

-

A).

Materiel

inspection

and repair________

__ TM

9-1100.

Instruction Gu

ide, binaural

training

instru

- TM 9-2662.

ments , Ml and

M 2.

[A.

G . 06

2.11

5-14-41).]

BY ORDER OF THE

SECRETARY OF WAR

G.

C. MARSHALL,

OFFICIAL,

E.

S. A D A M S ,

DISTRIBUTION

B

4 3); IR

4 2);

Bn

9 4);

1C

4 2), 9 6).

For

exp

lanation of symbols, see FM 21-6.)

25

a

S GOVERNMENT

PRINTING OFFICE;

1941

tm 9-1662 binaural training instruments m1 and m2 1941

Documents