Harris MW-1 Manual

www.SteamPoweredRadio.Com

____,.

J . 2

1999 2:48

118

4 P. 2

MW-1/1.A

FREQUENCY

CHANG.I!:

AND

T'U!lI~G

PROCEDURE

The

attached

procedur~

assumes

that

the

person

making

the

frequency

change

fairly

familiar

with

the

.MW

-1

also

assumes

that

the

transmitter

functioning

normally

prior

attempting

frequency

change.

This

includes

that

all

modules

have

all

transistors

the

specified

type,

and

that

the

duty

cycles,

phase

shifts,

and

current

all

the

modules

are

within

each

other.

The

person

performing

the

frequency

change

should

alert

any

~bnormalities

the

transmitter's

operation,

and

equipped

troubleshoot

any

problems

which

may

arise.

test

transmitter

operation

the

old

frequency

with

power

applied

strongly

recommended

determine

the

transmitter

condition

and

make

repairs

necessary

before

commencing

the

frequency

change.

WARNING

THE

CURUNTS

AND

VOLTAGES

TH:IS

EQUrPMENT

ARE

DANGEROUS.

PERSONNEL

MUST

ALL

TIMES OBSERVE SAFETY REGULATIONS.

This

procedure

intended

general

guide

for

tra

ned

and

qualified

personnel

who

are

aware

o f

the

dangers

inherent

handling

potentially

hazardous

electrical/electronic

circuits,

not

intended

contain

complete

statement

all

safe

t y

precautions

which

should

observed

personnel

using

other

electronic

equipment.

The

installation,

operation,

maintenance

and

service

this

equipment

involves

risks

both

personnel

and

equipment

and

must

performed

only

qualified

personnel

exercising

due

care.

HARRIS

CORPORATION

shal

not

responsible

fo~

injury

damage

resulting

from

improper

procedures

from

the

use

improperly

trained

inexperienced

personnel

performing

such

tasks.

WARNING

ALWAYS

DJ:SCOHNl:C'r

POWER

BEPORS OPBNING COVERS, DOORS, ENCLOSURES,

GATES,

P.AHELS

SH~ELDS.

.ALWAYS

usg

GROUNDING

STICKS

AND

SHORT

00"1'

HIGH

VOLTAGE

POINTS

BEFORE

SERV:ICJ:N'G.

NEVER

MAKE

INTERNAL

ADJUSTMENTS,

FZRl!'ORM

MArN'l'"BNAHCB

S:&:RVI:CE

WHEN

ALONE

WHEN

l!'ATIGUED

•

not

remove,

short

circuit

tamper

with

interlock

switches

access

covers,

doors,

enclosures,

gates,

pane

l s

shields.

Keep

away

from

live

circui

know

your

equipmen

and

don't

take

chances.

WARNING

CASE

EMERGENCY

ENSTJlU!:

THAT

POWER

HAS BEEN DISCONNECTED.

!?age

-1

www.SteamPoweredRadio.Com

MAR.

1999

2:49P

M NO. 1184 P. 3

MW-1/lA

FREQUENCY

CHANG

A.ND

READJUSTMENT

PROCEDURE

WARNJ:!iG

Disconnect

all

powe.z:-

from

the

trans:mitter

before

working

inside

the

transmitte~.

Install

all

Frequency

Determined

components.

Refer

factory

test

data

sheet

the

Frequency

Change

Components

list

for

the

correct

capacitor

values

and

coil

settings.

Install

crystal

the

Oscillator

P.C.

Board,

Al6.

For

carrier

frequencies

above

1250

KHZ

jumper

terminal

10.

{Crystal

frequency

divided

For

carrier

frequencies

below

1251

KHZ

jumper

terminals

and

(divide

4).

Install

the

IPA

Module,

A14.

Install

Ll8,

L19

and

C15

the

driver

module,

A13.

Install

Driver

and

modules

through

Al3

for

transmitters

below

1000

KHZ.

Install

lLl

hardware.

through

1L12

unifonnly

using

brass

Install

ClA

through

ClJ,

required,

under

side

output

network

deck.

Use

shorting

straps

816

-75

45-001

connect

each

capacitor

the

common

buss

ha~

the

center

the

inductors.

Install

capacitors

required

top

side

output

network

deck.

Set

the

tap

L13

the

number

active

turns

indicated

the

test

data

sheet.

j .

Set

the

rotor

Ll4.

the

internal

dummy

appropriate

setting.

Connect

transmitter

output

load

moving

S11

the

Remove

fuses

F2-F7

g4ting

and

power

control

board.

Turn

POWER

control

the

Gating

and

Power

Control

board

fully

CCW.

Adjust

DRV

VOLT

and

DRV

BIAS

center

their

range.

Turn

transmitter,

HIGH

POWER

Page

-2

www.SteamPoweredRadio.Com

MAR.

29.

199

NO.

1184

P. 4

MW-1/lA

FREQUENCY

CHANGE

AND

READJUSTMENT

PROCEDURE

NOTE:

All

commands

for

transmitter

from

this

point

will

the

HIGH

POWER

mode.

Osc.

function

test

Place

scope

probe

IPA,

terminal

10.

Adjust

pot

osc.

full

output

(CCW).

Scope

should

read

15-20Vpp

the

correct

carrier

frequency

7 .

IPA

Tuning.

Leaving

scope

probe

IPA,

adjust

for

peak.

(This

very

broad

peak}.

Driver

Tuning

and

Adjust

the

slug

L19

its

lowest

physical

position.

Adjust

L18

for

maximum RF

Driver

current.

Ll8

does

not

through

peak

the

value

ClS

will

have

changed

slightly.

the

slug

all

the

way

while

approaching

peak

Driver

current,

the

value

ClS

will

have

increased.

Conversely,

the

value

will

have

the

decreased

the

Driver

current

approaching

peak

with

the

slug

all

the

way

down.

Adjust

Ll9

for

about

amps

Driver

Current

Re-peak

L18.

Turn

off

transmitter.

f .

Reinstall

fuses

F2-F7.

output

adjustment.

Turn

transmitter

on,

high

power.

Slowly

adjust.

high

power

control

the

Gating

and

Power

control

board

clockwise

attain

approximately

30V

the

volt

meter.

Dip

the

vol

with

the

tune

control.

Adjust

the

current

12A

with

the

load

contro

l .

This

should

give

approximately

250W

(repeat

the

above

attain

30V/12A).

Always

dip

the

volts

with

the

tune

first,

and

last.

fault

indicators

should

ext

nguished

this

time.

not,

troubleshoot

the

cause.

10.

this

time

REL/VSWR

may

become

problem,

causing

VSWR

overload.

Turn

power

meter

switch

REL/VSWR..

Page

- 3

www.SteamPoweredRadio.Com

. 29. 1

999

M N

4 P. 5

MW-1/lA

FREQUENCY

CHA1'JGE

AND

READJUSTMENT

PROCEDURE

Null

the

REL/VSWR

adjusting

the

Directional

Coupler

balance

caps

C22

and

then

C20

for

zero

indication

the

power

meter.

null

not

obtainable,

select

capacitors

C23,

and/or

Cl9

place

the

variable

capacitors

C20

and

C22

approximately

the

middle

their

range

with

the

REL/VSWR

nulled

zero.

C22

C20

are

maximum

capacity

(screwed

tight),

C23

C19

will

need

increased

value.

C22

C20

are

minimwn

capacity,

C23

Cl9

will

need

decreased

value.

selection

capaci

ors

provided

with

the

frequency

change

parts.

Paralleling

two

caps

m0ay

necessary

some

applications.

null

cannot

obtained

with

C22 a t minimum

capacitance

and

C23

capacitance

short

out

one

sections

using

buss

wire

the

terminal

posts

provided

enable

C22

null

the

REL/VSWR

zero.

Re-null

C20.

Repeat

the

nulling

C20

and

C22

until

the

REL/VSWR

nulls

zero

11.

driver

current

above

1.5

below

1 . 0

Amps,

adjust

L19,

(RF

DVR)

control,

get

the

current

range,

1.3

amps.

Re-peak

the

Driver

current

tuning,

LlB.

12.

Slowly

adjust

the

high

power

control

attain

voltage

52V.

Adjust

small

increments,

keeping

the

Volts

the

dip

with

the

tuning

necessary

obtain

22.SA

with

volts

52V.

Repeat

the

tuning

and

necessary

obtain

the

above

ratio.

Always

dip

the

volts

with

the

tune

first

and

last

Power

should

approximately

900-9S0W

when

finished.

13.

Re-peak

Ll8

and

reload

Ll9

for

approximately

1.3

amps.

Re-

adjust

REL/VSWR

balance

controls

C20

and

C22

for

zero

the

REL/VSWR

position.

Re-select

Cl9

and

C23

jumpers

necessary.

Page

- 4

www.SteamPoweredRadio.Com

MAR

29.

. 11

MW-1/lA

FREQUENCY

CHANGE

AND

READJUSTMENT PROCEDURE

14.

Driver

and

Bias

Voltage

Adjustments.

Adjust

driver

bias

and

voltage

controls

for

best

distortion

1000

and

10,000

Hz.

15.

VSWR

Trip

Point

Adjustment.

Adjust

power

out

1000

with

the

high

power

pot.

Turn

power

meter

switch

REL/VSWR.

Turn

load

control

the

direction

which

lowers

amps

until

REL/VSWR

indicating

500

watts.

Adjust

VSWR

pot,

R8,

the

Input

and

overload

board

trip

the

VSWR

circuit

this

S00W

indication.

Return

load

control

normal

operating

ratio

S2V/22.5A.

16.

Output

Network

Tuning

Ratio

and

Feedback

voltage

adjustment.

Adjust

the

transmitter

output

power

with

the

POWER

pot

250

watts.

Using

scope

with

Xl0

probe,

measure

the

voltages

the

tuning

buss

bar,

and

the

transmitter

output

the

antenna/dummy

load

switch,

S11.

The

voltage

should

70%

plus/minus

the

voltage

the

antenna/dummy

load

plug.

this

ratio

incorrect,

shut

off

the

transmitter,

move

the

tap

L13

one

turn

either

direction,

adjust

_the

POWER

pot

the

Gating

and

Power

Control

board

full

counter-clockwise,

turn

the

transmitter

t.o

POWER,

and

repeat

the

tuning

and

procedure,

steps

and

12.

Repeat

this

procedure

until

the

ratio

correct.

Ll3

should

tapped

than

turns

either

side

its

assigned

setting

for

the

new

frequency.

The

Feedback

Voltage

measurement

made

the

ttvo

jumpered

terminals

RS,

the

motorized

fine

power

control

pot,

located

the

drop

down

door.

correct

reading

-12

-16V

Volts

DC.

the

voltage

lower

than

-12V

DC,

decrease

the

value

C18

C17

the

directional

coupler;

the

voltage

greater

than

-16V,

increase

C17

C18

. A

selection

capacitors

provided

with

the

frequency

change

parts.

Page

- 5

www.SteamPoweredRadio.Com

MAR.

29.

1999

50PM

. 1

P. 7

MW-1

FREQUENCY

CHANGE

AL"\ID

READJUSTMENT

PROCEDURE

17.

D.C.

Overload

adjustment.

Set

the

overload

pot

the

front

door

fully

clockwise.

Adjust

transmitter

power

1100

watts.

Modulate

the

transmitter

100%

with

tone.

advisable

use

scope

connected

the

modulation

monitor

output,

TB2-23 & TB2-22 {gnd)

the

floor

the

back

the

transmitter,

rather

than

modulation

monitor,

read

this

low

frequency

modulation.

Sync

the

scope

via

its

external

input

with

the

applied

audio.

Adjust

the

OVERLOAD

pot

counterclockwise

slowly

until

the

transmitter

trips

off,

displaying

the

fault.

C. Remove

the

audio

from

the

transmitter.

Turn

transmitter

1100

watts.

should

not

overload.

does,

the

OVERLOAD

control

set

too

tight;

repeat

the

above

procedure,

adjusting

th~

OVERLOAD

slowly

until

the

trip

point

reached.

When

this

adjustment

transmitter

power.

completed,

remove

all

18.

Overvoltage

adjustment.

Set

the

OVERVOLTAGE

and

REGULATOR

ADJUST

pots

the

front

door

fully

clockwise.

Remove

fuses

Fl-F7

the

Gating

and

Power

Control

board

Turn

the

transmitter

High

power

. PA

Volts

should

rise

60-70

Volts.

Amps

should

read

(If

the

Volt

meter

pegs,

immediately

shut

off

the

transmitter.

There

problem

with

and

its

associated

components

the

Audio

ver

board,

Fix

this

problem

before

proceeding.)

With

the

Multimeter

the

140V

supply

position,

allow

the

regulator

transformer

time

bring

the

140V

supply

reading

155

volts.

Adjust

the

REGULATOR

ADJ,

pot

for

stable

155V

this

supply.

the

regulator

transformer,

T2,

won't

bring

the

supply

voltage

155V

with

the

REGULATOR

ADJ.

pot

maximum

CW,

turn

off

the

transmitter,

remove

power,

and

temporarily

move

wire

transformer

down

one

tap

from

where

now,

unless

wire

already

the

210V

tap

(

terminal

#3)

THIS

CASE,

LEAVE

WIRE

WHERE

IS.

(Brown

wire

#22

should

always

the

240

tap

regardless

where

wire

moved.)

Page

- 6

www.SteamPoweredRadio.Com

29.

999

:50

P. 8

Ml:/IJ-1/lA

FREQUENCY

CHANGE

A.~D

READJUSTMENT

PROCEDURE

Turn

transmitter

and

re-adjust.

the

REGULATOR

ADJ,

pot

for

lSSV,

possible,

the

140V

multimeter

position.

155V

not

attainable

per

step

c ,

adjust

the

regulator

for

the

highest

voltage

attainable

below

155V.

Never

exceed

lSSV.

Adjust

the

OVERVOLTAGE

pot

until

the

transmitter

trips

off,

displaying

the

OVERVOLTAGE

overload.

Adjust

the

pot

1/8

turn

clockwise

from

the

trip

point.

Remove

transmitter

power

and

restore

wire

its

original

position.

Turn

only

the

REGULATOR

ADJ

pot

fully

counterclockwise.

Replace

fuses

Fl-F7

the

Gating

and

Power

control

board,

19.

Regulator

Adjustment

(T2}.

Turn

the

transmitter

High

power

and

adjust

output

power

1000

watts

without

modulation.

Slowly

adjust

the

REGULATOR

ADJ.

pot

for

135V

the

140V

multimeter

position,

giving

transformer

time

catch

the

setting.

The

wiper

contact

should

the

middle

portion

travel

(1/4

2/3

travel).

the

wiper

either

extreme,

turn

o f f

the

transmitt.er

and

retap

transformer

moving

gray

wire

either

down

one

tap

from

its

present

position.

The

brown

wire,

#22,

should

always

stay

the

240V

tap,

depending

the

position

the

wiper

T2.

T2's

wiper

the

top

end

travel,

move

wire

down

one

tap.

T2's

wiper

the

bottom

end

travel,

move

the

wire

one

tap.

With

power

re-applied

and

transmitter

output

power

set

1000

watts

without

modulation,

adjust

the

REGULATOR

ADJ.

pot

135V

the

140V

power

supply

multimeter

position.

This

completes

the

MW-1

Frequency

Change.

formal

Proof-of-

Performance

may

done

this

time.

Page

- 7

www.SteamPoweredRadio.Com

AR.

29.

199

2:50

4 P. 9

MW-1/lA

FREQUENCY

CHANGE

AND

READJUSTMENT PROCEDURE

- 1 DIRECTIONAL COUPLER CAPACITOR SELECTION

+ RF DRIVER

PADDER

CAP

The

following

parts

must

supplied

along

with

the

Frequency

Determined

Components.

Part#'

Description

C17

and

Cl8

500-0903-000

2700

pf,

500v

500-0881-000

3000

pf,

500v

500-0882-000

3600

pf,

500v

500-0888-000

3900

pf,

soov

500-0883-000

4700

pf,

SOOv

C23

500

0804

000

pf,

500v

500-0803-000

pf'

500v

500-0811-000

pf,

500v

500-0817-000

pf,

500v

500-0812-000

pf,

500v

C19

500-0759-000

100

pf,

500v

500

0755-000

270

pf,

soov

500-0833-000

390

pf,

500v

500-0835

000

470

pf,

S00v

500-0838-000

560

pf,

500v

500

0840-000

680

pf,

500v

ClS

PADDER

500-0852-000

1000

pf,

S0Ov

Page

- 8

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