Qei 691 User manual

(609) 728·2020

CORPORATI N

ONE

AIRPORT DRIVE,

P.

O.

BOX

0

..

WILLIAMSTOWN,

N.

J. 08094

FM

MODULATION

MONITOR/TEST

SET

MODEL

691

INSTRUCTION

MANUAL

INFORMATION

FOR

ION

-02,

DUAL

67

&

92

KHz

SCA,

IS

LOCATED

IN

THE

APPENDIX

IS

MANUAL.

SECTION

1

GENERAL

INFORMATION

1-1

DESCRIPTION

The

QEI

Model

691

Modul

on

Monitor/Test (

Type

Approval

Number

3-244 )

is

an

all

id Modulation

Man;

designed to

meet

or

exceed the

Communication

Commission

requirements

for

measuring the

modul

on

cs

of

FM

transmitters

having a

frequency range

of

88.1MHz

.9MHz

both

at

the

transmitter

and

aff-

air.

The

1

is

in a

1O~"

X

19"

rack

mount.

All

controls are located

on

the

front

panel.

AC

Power,

RF

Inpu

Outputs are located

on

the

rear

panel.

1

ELECTRICAL

FICATIONS

RF

Frequency

Range

..................

88.1 -

107.9r1Hz

(Thumbwheel

s

RF

rnput (to guarantee

66dB

SIN

in a

30KHz

Bandwidth)

An

tenna

...

. . . . . . . . . . . . . . . . . . . .

..

3mv

200mv

Signal

........................

2mw

50W

(depending

on

external

load)

Total Modulation Display

~iodulati

on

Meter

Accuracy

........................

+2%

entire

range

Frequency

..............

O.2d8

30Hz

-

75KHz

Range

...........................

0-133%

(-20d8

to

+2dB)

111s

cs

.....•................

per

FCC

regulations

rs

..........................

"'.11>

•••••

Ace

u

racy,.

,

.....

""". "

..

"

..

_"

....

"...... "

...

""

Peak

Counter

Poi

Time

..

". ""

II

..

, " •

'"

,

11

'"

» " ..

It

'"

....

II

•

'"

...

l1li

..

I

(I

0-199%

in

1%

increments

+

1%

100%

+

1%

1 minute + 1

sec.

Distortion

..........................

0.05%

THD

or

IMO

SIN

•

.••.••••.•.•••••••••••••••.••.••

better

than {with

de-emp}

in a

30KHz

Bandwidth

Test Displays (2)

Me

ter

Accu

ra

cy

..................

.

Peak

Indicator

Ac

..........

.

Meter

Range

.....................

.

Pilot

&

SCA

Injection

better

than

+

2%

entire

range

+"

1%

to

-75dB

(autoraryging)

~

0.5%

(6%

to

12%)

~

Separation

L

into

R or R

into

L

..........

55db

Crosstalk

Main

into

Sub

...•..

Sub

into

Main

.••.•

SCA

in

Sub

or

Main

..

Pilot

into

Sub

or

Main.

Monitoring

Modes

1)

2)

Main

3}

Pil level

4)

38KHz

5)

FM/S/N

6)

SeA

Inj.

narrow

7)

SCA

Inj.

wi

Distortion

(

THD

• • • .

IMD

. . . . . .

(4KHz

dev.)

Outputs

Right

Scope

Frequency .

or ght)

Spectrum Analyzer Output

X

Hori

zonta1. . . . . .

YVertical

......

.

1

MECHANICAL

SPECIFICATIONS

Dimensions.

Weight

....

Ambient

Operating

Temp.

•

65db

.

65db

. . .

70

db

70

db

Right

Sub

Phase Cal.

Gen.

Phase

AM

SIN

Main

SCA

Mod.

0.05%

·

0.1%

(SMPTE}

·

1%

(50Hz

to

5KHz)

(150us

de-emp)

+10

dbm

bal.

and

Hi-z

·

+10

dbm

bal.

and

Hi-z

IVpp

X.D,

I.F.

Pilot,

SCA

(TTL)

·

4Vpp

0.5V/lOdb

• (lOt"H ) x

(l9

uW ) x

(I2

11

D )

(26.68cm)

x

(48.29cm)

x

(30.Scm)

16

1

·

3rF

of

aoc

to

60°C

1-4

INSTRUMENT

IDENTIFICATION

This

unit is identified

by

a

Model

and

Serial

Number

located

on

the

rear

panel.

All

correspondence to your sales representative

or

the factory

in

regard to the

unit should reference the

complete

Model

and

Serial

Numbers.

1-5

OPTIONS

(01)

SCA

Monitor

option

(67KHz)

consists of the plug

1n

board

assembly

A6

(02)

SCA

Monitor

option (special frequency) (not

FCC

Type

Approved)

(03)

CerR

Specifications (not

FCC

Type

Approved)

2-1

INITIAL

INSPECTION

SECTION

2

INSTALLATION

ChecK

the shipping carton for external

damage.

If

the carton

exhibits

evidence

of

abuse in handling

(holes,

broken

corners,

etc.)

ask

the

carrier

agent

to

be

present

when

the

unit

is

unpacked. Carefully

unpack

the

unit

and

inspect

all

equipment for physical

damage.

Immediately

after

unpacking any bent or broken

parts,

or

scratches should

be

noted.

Keep

all

packing material

for

proof

of

damage

claim or

for

possible

future

use.

2

PREPARATION

FOR

USE

The

unit

is

designed

to

be

mounted

in a standard

19"

rack. Air space should

be

provided

above

and

below

the

unit

so

that

heat generated

by

the

circuitry

may

be

dissipated.

Additional co01in9

may

required

if

the

unit

is

placed

above

high heat generating equisment

in

order

to

keep

the

ambient temperature

below

the

maximum

specified

(50

C).

Mount

the

unit

to the rack using

#10

caun

ink screws

and

finishing

washers.

The

unit

requires a l05-125V ngle phase,

SO/60Hz

power

source

or

a

220-250V

single

phase.

SO/60Hz

power

source.

The

identification

plate

on

the

back

panel

shows

for

which

power

source the

unit

is

wired.

See

Section 5-7

for

information

on

changing

MONITOR

CONNECTIONS

1.

Connect the antenna supplied

to

monitor

ANT

connector Jl1

if

off

air

operation

is

desired.

2.

Connect a

dummy

load

1a

enough

to handle the

RF

input to

DUMMY

LOAD

connector J9. A

~

watt termination

is

supplied.

The

input signal sampler

will handle

up

to

50

watts with

an

adequate external

dummy

load. thus

allowing

direct

measurement of

exciters

and

low

power

transmitters.

DO

NOT

OPERATE

THIS

EQUIPMENT

WITHOUT

AN

ADEQUATE

DUMMV

LOAD

INSTALL

3.

Connect the

RF

sample

to

RF

IN

connector J10.

4.

TB1-4

and

TSI

are

600

ohm

balanced

left

audio

output.

5.

TB1-6

and

TB

7 are

600

ohm

balanced

right

audio output.

6.

TSl

is

600

ohm

unbalanced

SeA

audio

(ref.

to gnd.)

2-4

REPACKING

FOR

SHIPMENT

NOTE:

WARRANTY

MAY

VOID

IF

UN

IS

NOT

RETURNED

IN

ORIGINAL

PACKING.

NOTE:

Before returning a unit for

repair

or

calibration,

contact the

ry

or your author; representative for Return Authorization. Attach a tag

showing

owner's

name

and

address. A ption of the service required

should also

be

included.

it

must

be

shipped prepaid

and

insured for full

value.

USE

THE

ORIGINAL

SHIPPING

CARTON

AND

PACKING

MATERIAL

FOR

RE-SHIPMENT.

SECTION

3

OPERATION

3-1

OPERATOR

CONTROLS

AND

INDICATORS

(FRONT

PANEL)

1.

POWER

Switch

and

led

A1S1

and

AleRl

apply

line

power

to

unit.

2.

CARRIER

FREQUENCY

thumbwheel

AIS2

sets

unit

on

desired frequency.

3.

L.O.

UNLOCK

1

A1CR2

Led

lights

if

local 11ator

;s

unlocked

or

reference

is

lost.

4.

RF

LEVEL

leds

A1CR3

(Hi),

AICR4

(LO),

A

(OK)

a.

Ale

(OK)

will

light

and

AICR4

(LO)

will

is

sufficient

RF

input to allow accurate modulation

and

measurements. This level will normally

be

obtained

wi

supplied

wi

in the

70dBu

contour.

go

out

when

there

signal to noise

the antenna

b.

AICR3

(Hi) will

light

if

an

excessive

RF

sample

is

applied.

Reduce

the

RF

LEVEL

t

on

rear

panel

until

AICR3

extinguishes.

A1CR5

(OK)

will

remain

lit

with

Hi

Rf

level since

all

required monitor functions

will

in

specified on.

However.

AM

Signal

to

Noise

wi1l not accurate be-

cause of

saturation

the

IF

amplifier.

In

addition,

when

AICR3

(Hi)

is

lit.

the input mixer

is

being protected

by

an

input

clipper.

5.

MUTE

Switch

AlS3

a.

With

MUTE

switch in

ON

ition

unit

will

mute

all

signals

below

RF

LEVEL

OK

hold.

6.

COMP

Jack AIJI provides a

6Vpp

wideband

compos;

signal.

7.

DE-EMP

AUDIO

ck

AIJ2

prov; a

6V

p

p'

@

400Hz

signal with 75usec

de-emphasis.

NOTE:

This signal

is

filterea

to

remove

19KHz.

8.

TOTAL

MODULATION

Displays (Yellow)

a.

AIM1

in conjunction with

MOD

METER

switch

AlS4A

prov;

total

modula

on

(main,

sub

and

SCA)

i

ication

with semi-peak

ballistics

switchable to

POS

or

NEG.

b,

PEAK

MOO

thumbwheel

AlS5

and

lamp

AIDSl

provide a

total

modula-

t'ion

peak

indicator

independent

of

polarity

and

settable

in

1%

increments

from

0 to

199%.

This

flasher

will

light

from

2 to 4 seconds each

me

a

peak

is

detected.

c.

100%

PEAKS

PER

MINUTE

Display

AIDS2

and

RESET/OfF

Switch

A1S6

provide a count of

5ms

100%

peaks.

The

display flashes

at

a count

of

10,

has

a

maximum

count

of

19

and

resets

automatically each minute.

RESET

over-

ri

the automatic

reset

function

and

OFF

extinguishes the display. This

indication

is

in

to

moni

modula

on

peaks

for Automatic Transmitter

tems

(ATS)

as

ned

by

the

FCC

in the

ATS

rules.

d.

CAL

pushbutton

AlS7

provides a modulation

calibrate

.;~

.

signal.

The

frequency

this

signal

is

32KHz.

Section 5

for

further

information.

NOTE:

lO

UNLOCK

led

must

light

when

CAL

is

depressed.

9.

Display (Vector

and

Spectrum Analyzer)

NOTE:

To

use these features

of

the

691

res

an

oscilloscope

wi

X

and

V

DC

Coupled

inputs.

The

bandwidth

of

scope

need

only

be

a

few

hundred kTTohertz but

it

must

DC

Coupled

on

both X

and

Y

inputs.

a. Connect

VERT

(AIJ3)

Scope

Y input. Connect

HORIZ

(AIJ4)

to

Scope

Xinput.

Set

both inputs

to

DC

coupled, 0.5

vol

/div.

b.

To

ew

Stereo Vector

pattern,

depress

VECTOR

on

AlS4B.

Mono

modulation will

ve

a

vertical

line.

Any

deviation

from

vertical

in-

dicates

that

the

on

mono

balance

is

incorrect.

c.

To

use Spectrum Analyzer , depress

NARROW

pushbutton

on

AIS4B.

Adjust horiz.

(X)

gain

get

full

width

baseline.

Adjust

vert

(V)

gain to O.5/div.

Dis

ay

will centered

on

de-

termined

by

CARRIER

FREQUENCY

swi

and

will

be

approximately

and

10dS/div. Depressing

WIDE

pushbutton will change dispersion to approximately

+350KHz.

NOTE:

WIDE

position will cause

TOTAL

MODULATION

displ to pin

-

and

peak

flasher

if

is

OFF.

10.

PILOT

PRESENT

indicator

A1DS3

and

0AOJ

AIR!

indicate

the presence

of

the

pilot

tone

and

provide monitor

calibration

in conjunction

with 0 posi

on

of

CHANNEL

B

DISPLAY

SELECT.

lot

0

ADJ

AIRl

is

set

for a null

on

CHANNEL

B meter. This adjustment

is

accurate

even

with

modu-

lation

appli

11.

SeA

PRESENT

indicator

AIDS4

indicates

the presence

of

SCA.

DEV

switch

A1S9

may

be

set

to cause

CHANNEL

B

SCA

MOD

spl

to

indica

100%

at

ei

4KHz

or

6KHz

dev; on.

12.

FREQ

Jack

AIJ5

and

switch

AIS8

provide a conveni output

for

an

external counter to read

station

frequency,

pilot

frequency or

SeA

frequency.

To

read

station

requires a counter capable

lO.7MHz.

First

con-

the counter to

XO

jack

on

the

rear

panel.

If

the

X.D.

;s

not exactly

8.000000MHz,

adjust

piston trimmer

on

the monitor

A2

as y

until

it

See

Section 5

details.

Now

the counter to

A1J5

and

place

to

IF

position.

counter should

1O.7MHz.

If

it

lower.

station

frequency

is

higher

by

the

same

number

of

hertz.

Conversely.

if

reads

hi

her, the s ion frequency

is

lower.

NOTE:

.=.B.=.e--=...::..:....:;:.-::..:..-..,:=

13.

OUTPUT

SELECT

Switch

A1SIO.

AUDIO'

Jack AIJ6

and

SCOPE

Jack

A1J7

provide

distortion

measuring outputs

and

scope observation output. Switch

AISIO

in

FT/CHAN

A

position

provides

left

deemphasized audio with a

cutoff

frequency

of

15KHz

for 5

distortion

measurements

at

AIJ6

and

whatever

is

displayed

on

the

CHANNEL

Ameter

at

AIJ7

for

scope observation.

When

AISIO

is

in

RIGHT/CHAN

B

position,

right

audio is provided

at

AIJ6

and

Channel

B signal appears

at

AIJ7.

14.

SeA

Audio

Jack

AIJ8

provides 150usec deemphasized

5KHz

bandwidth

SeA

audio for

distortion

measurements.

15.

TEST

DISPLAYS

(CHANNEL

A - green)

(CHANNEL

B - blue)

and

DISPLAY

SELECT

switch AISII

a.

DISPLAY

SELECT

switch

controls

the s;gna1

componen

to

be

displayed.

b.

Meters

AIM2A

and

A1M2B

in conjunction with

+/-

switches

AlS13A

and

AlS13B,

MOD;

HOLD:

AUTO

switches

AlS14A

and

AlS14B

and

RANGE

(-dB) readouts

AIDS5A

and

AIDS5B

provi

two

metering

displays

with a

range of 0

to

133%

with

FCC

ballistics

(MOD

posi on)

or

-70dB

to

+3dB

with

semi

VU

ballistics

(AUTO

or

HOLD

posi on). These

displays

may

be

switched to +

or

-

indications

and

may

be

deemphasized

by

pushbuttons

A2S15A

or

AlS15B.

NOTE:

FM

and

AM

S/N

are

automatically deemphasized.

c.

PEAK

thumbwheels

AlS12A

and

A1S12B

and

leds

A1CR6A

and

A1CR6B

provide a

peak

indication

of

the corresponding meter

display

settable

in

incremen

from

0 to

199%.

OPERATOR

CONTROL

AND

CONNECTIONS

(REAR

PANEL)

2.

RF

INPUT

Jack

AIJIO

-Transmitter

RF

sample connects

to

this

jack.

3.

CARRI

LEVEL

Control

AIR2

-This control

is

used

to

reduce

RF

Input

below

RF

HI

threshold.

4.

ANT

Jack

AIJll

-

75

ohm

FM

Antenna

to

this

jack.

5.

X.O.

OUT

Jack

AIJ12

-

8MHz

sample

from

crys 1 reference

oscillator

is

available

this

jack

for

measurement purposes.

6.

S.A.

CENTER

Control

A1R3

-Control used

to

center

Spectrum Analyzer

splay.

QEI 691 User manual

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