Mark IV Electro-Voice 903E User manual

SPECIFICATIONS

(Per

RTCA/DO-170)

Generating

Element:

Electret

Condenser

Frequency

Response:

300-5,000

see

Figure

Polar

Pattern:

Pressure

gradient

(differential

close-talking)

Impedance:

Matches

standard

aircraft

carbon

circuitry

DESCRIPTION

The

Electro-Voice

model

903E

condenser

handheld

microphone

designed

for

use

high

noise

environments

where

high

speech

intelligibility

desired

such

aircraft

cockpits,

passenger

cabins,

control

towers

terminal

areas.

The

electret

element

virtually

eliminates

EMI,

RFl.

and

magnetic

signals

channeling

the

full

power

your

communications

system

into

crisp,

articulate

voice

transmission

with

the

RTCA

frequency

response.

Sensitivity:

400

±3

for

114

20/i

pascals

(normal

speech)

(output

built-in

amplifier)

Power

Requirements.

See

test

circuit

Figure

(operates

into

carbon

microphone

circuit)

Current

Drain:

(12-volt

system)

(24*volt

system)

Case

Material:

Black

A3S

Dimensions:

91.5

(3.6

in,)

length,

less

hanger

61.0

(2.4

in.)

width

35.6

(1.4

in.)

depth

Weight:

180

grams

Accessories

Supplied:

Panel

mounting

bracket

(8474)

Certification;

FAA

TSO

C-58a

The

microphone

recommended

for

advanced

technology

air

transports

employing

electronic

flight

insUumentation

systems

(glass

cockpits).

Its

proven

electret

technology

will

not

decay

deteriorate

any

way

over

extended

periods.

Features:

•

Highly

reliable

•

EMI

and

RFl

protected

•

Tailored

voice

response

tor

high

articulation

per

RTCAyDO-l70

•

Immune

aircraft

generated

magnetic

fields

•

Greater

durability

•

Lightweight

•

903-1341

(with

PJ-068

connector)

•

903-1342

(with

A4M

connector)

WARRANTY

(Limited)

Electro-Voice

.Aircraft

Microphones

are

guaranteed

for

period

thirty-six

m.onths

from

date

original

purchase

acamst

malfunction

due

defects

workmarsnip

and

materials.

such

malfunction

occurs,

microphone

will

repaired

replaced

(at

our

option)

without

charge

for

materials

labor

delivered

prepaid

the

proper

Electro-Voice

service

facility

Unit

will

returned

prepaid

Warranty

does

not

extend

finish,

appearance

itemis.

cables,

cade

connectors,

switches

malfunction

due

abuse

operation

under

other

than

specified

conditions,

nor

does

extend

incidental

consequential

damages

Some

states

not

allow

the

exclusion

limitation

incidental

consequential

damages,

the

above

exclusion

may

not

apply

you

Repair

other

than

Electro-Voice

its

authorized

service

agencies

will

void

this

guarantee.

This

warranty

gives

you

specific

legal

rights,

and

you

may

also

have

other

rights

which

vary

from

state

Service

and

repair

address

for

this

product:

Electro-Voice.

Inc..

600

Cecil

Street.

Buchanan,

Michigan

49107.

Specifications

subject

change

without

notice

REPAIR

INSTRUCTIONS

Special

Tools:

None.

Disassembly;

(See

Figure

Remove

rear

screws,

holding

front

and

rear

case

halves

together.

Mic

head

assembly

will

slip

out

front

case

Switch

plate

has

removed

cable

S/A

removed

Inspection:

Inspect

switch

contacts

for

signs

excessive

wear,

Examine

unit

for

damaged

dned-oul

wiring

sleeving.

Check

all

solder

connections

for

good

contacts.

Check

cable

for

signs

damage

such

cuts

cracks.

Repair

and

Replacement:

Replace

any

part

which

damaged.

The

mic

head

assembly

sealed

and

not

repairable—replace

entire

assembly

(EV#81393)

defective.

Reassembly:

Reverse

Step

above

Check

Microphone

Output:

The

eieciret

microphone

has

the

carbon

equivalent

circuit

inside

the

head

assembly

speech

output

approx¬

imately

0.2

volts

should

obtained

when

used

with

the

DO-170

test

circuit

aircraft

intercom.

Performance

Specifications

Electrical

conformance

DO*

170

requires

special

equipment

and

artificial

voice.

Certification

can

only

given

the

Electro-Voice

Service

Center

Buchanan,

Michigan.

proof

performance

and/or

certification

required,

send

the

unit

the

warranty

address

Page

ITEM

PART

NO.

REQ’O.

DESCRIPTION

A72319-RL

From

Case

75241

Inse't

75993

Pivot

75992-AY

Switch

Piaie

7599IRL

Actuator

62607-AO

Screw.

Pan

Head,

Phillips

56065

Leaf

Switch

L60126-AP

Screw

Binding

Head.

Phillips

4067-AD

Lock

Washer

19048-AD

Spring

38283

RuOber

Gasket

48875

Nameplate

A72318

Foam

Spacer

X48559

Nameplate

(903-1342)

W40559

Nameplate

(903*1341)

C60024-AD

^rews.

72570-RL

Case

Back

62608

Screw.

Filled

Kead

Slotted

81393

Microphone

S/A

62609

Screw.

Filled

Head.

Slotted

27057

Lug

81489

Cable

S/A

with

A4M

(903-1342)

81488

Cable

S/A

with

PJ-068

(903-1341)

8474

Mounting

Bracket

ENVIRONMENTAL

QUALIFICATION

FORM

MICROPHONE,

ELECTRET,

(HANDHELD

903E

913E),

(BOOM

MOUNTED

978E)

MODELS;

978E,

903E

913E

TSO

NUMBER:

TSO-C58a

Specifications

Enclosed

with

Microphones

CONDITIONS

DO-160B

PARAGRAPH

DESCRIPTION

CONDUCTED

TESTS

Temperature

and

Altitude

Low

Temperature

High

Temperature

Altitude

Decompression

Over

Pressure

4.0

Rev.

4.5.1

5.2.

5.3

46.1

6.2

Equipment

tested

Category

Decompression

tested

53.000

ft.

Temperature

Variation

5.0

Equipment

tested

Category

Humidity

6.0

Equipment

tested

Category's.

Level

Shock

Operational

Crash

Safety

7.0

7.2

7.3

test

required

Vibration

8.0

Equipment

tested

without

shock

mounts

Category

A’

Audio

Frequency

Conducted

Susceptibility

18.0

test

required

Induced

Signal

Susceptibility^

19.0

Equipment

tested

Category

Radio

Frequency

Susceptibility^

Equipment

tested

Category

*B'

Radio

Frequency

Emmission^

Equipment

tested

Category

*6’

Other

Test2

Fire

resistance

tests

were

conducted

accordance

with

Federal

Aviation

Regulation.

Part

25.

Appendix

25.853

and

1359

(d)

REMARKS

—

Tests

were

performed

Electro*Voice.

Inc.,

Sevierville.

TN.

except

the

following:

^Radiometrics

Midwest

Corp,

Lombard.

2Gaynes

Testing

Laboratories.

Chicago.

ELECTRO-VOICE,

INC.,

600

Cecil

Street.

Buchanan,

Michigan

49107

VANLFACTURING

PLAfsrrS

■

BUCHANAN

■

NEV/PORT.

■

SEVIERVILLE

■

REDMOND

■

GANANOOUE

ONT

Pan

Number

531409—939

©Eiearo-voice,

inc.

1989

■

LittTO

-a

MARK

conipany.

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