Harris MW-1 Referenzhandbuch

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J)HARRIS

MW-1

Bulletin

AM-114-LAP

Equipment:

Date

6-10-77

This

Service

Bulletin

issued

"State-of-the-Art"

up-date

for

the

MW-1

transmitter.

recommended

that

the

enclosed

information

reviewed

the

station

engineer

since

these

product

improvements

may

have

been

included

your

transmitter.

Hence,

not

all

modifications

enclosed

herein

are

applicable

your

station.

Since

there

industry

wide

shortaRe

parts,

recommend

that

where

possible,

parts

obtained

locally

possibly

already

hand

the

station.

IMPROVE TRANSMITTER GROUNDING

Wide

differences

transmitter

installations

indicate

that

superior

grounding

techniques

must

employed

for

equipment

protection

and

reliability.

Add

one

inch

wide

copper

aluminum

ground

strap

rom

the

back

center

the

module

deck

support

bracket

crossmember,

the

back

the

transm

tter.

Attach

the

other

ena

any

open

position

the

back

center

the

coil

assembly

deck's

bottom.

~ggested

grounding

location

would

viewed

Trom

the

back

the

transmitter,

just

front

the

center

point

the

C-1

capacitors.

{Section

I-A)

Continue

the

ground

strap

the

left

rear

side

~he

transmitter

cabinets

from

-the

deck

assembly

th.P.

bottom

the

output

deck

assembly

above.

suggest

one

two

inch

wide

copper

strap.

Attach

strap

with

any

8-32

similar

bolts

hand

the

station.

(Bottom

Picture;

Section

I-B)

II.

AUDIO DRIVER ASSEMBLY

A-17

(992-4206-001)

Audio

Change

C-2

(1,000

pf,

500V)

2,000

capacitor

(Harris

Part

Number

500-0845-000).

HARRIS

CORPORATION

P.O.

Box

4290,

Quincy,

llllnols

62305

217

/222

8200

112-437-0610

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-- v2 .

Change

R-17

(27

ohm

2W)

240

ohm

resistor

(Harris

Part

Number

540-0596-000).

Zener

diode

CR-3

heat

sink

improvement.

Remove

split

•

lock

washer

from

under

CR-3

located

heat

sink

be-

neath

A-17

board.

III.

REMOTE

CURRENT

AMPLIFIER,

A-22

ASSEMBLY

(992-4213-002)

Variation

Remote

current

metering

during

modulation.

Add

capacitor

between

terminals

and

22.

Use

any

volt

electrolytic,

tantalum

paper

capacitor.

suggest

a 1

mfd

capacitor.

IV.

MODULES

(992-4201-001)

SERVICE INFORMATION

Testing

with

sine

wave

tones.

has

come

our

attention

that

some

extremely

long

and

continuous

test

procedures

are

being

used

for

Distortion

and

Response

testing.

recommend

that

when

testing

the

transmitter's

audio

quality

above

kHz

full

modulation,

that

such

testing

should

short

duration

reduce

stress

components.

AUDIO

PAD

CHANGE,

A-18

ASSEMBLY

(992-4205-001)

600

Ohm

termination

resistance

changes

when

switching

between

High/Low

power

levels.

Change

configuration

Audio

pad.

Review

attached

drawing

and

overall

drawings

Instruc-

tion

Book.

Remove

one

end

100

ohm

R-19

resistor.

Add

resistor

for

your

power

level

between

freed

end

R-19

and

board.

K-3A,

re-arrange

audio

wire

number

150

per

drawing.

Add

shielded

single

conductor

cable

from

the

junction

R-19

and

relay

K-3A

shown

drawing.

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""'

K-

=-------

www.SteamPoweredRadio.Com

MW-1

Field

Service

Bulletin

AM-114-LAP

Module

Deck

Ground

Strao

{Section

I-A)

Main

Cabinet

Ground

Strap

{Section

I-B)

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