TFT 730A Manuale utente

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S.C.A.

MODULA

ION

MONITOR

MODEL

730A

J17EffL

TIME AND FREQUENCY

TECHNOLOGY, /N,

www.SteamPoweredRadio.Com

s.c.A.

MODULATION

MONITOR

MODEL

730A

Instrument Serial#

----

Manual

Revision

TIME

FREQUENCY

TECHNOLOGY,

INC.

3000

OLCOTT

STREET

SANTA

CLARA,

95051

408-246-6365

www.SteamPoweredRadio.Com

...

......

-·-----

------.........

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SECTION

TABLE

CONTENTS

GENERAL

INFORMATI

Page

Gene

ra1

. . . ••. •. . ••. . . . . . . •. • 1-1

1.2

Specifications

..••

•.

.....

..••

. •

......•..

1-1

1.3 Accessory

Equipment

••..•

•.

•••

•••••••

•• 1-4

1.3.1

Model

704B

Remote

Meter

and

Peak

Flasher••.

•••.

..•..

.•.•

•.•

...

1-4

1. 4

Warranty

...

....

. .

.....

....

1-5

1.5

Claims

for

Damage

in Shipment•• .

•..•....

1-5

INSTALLATION

2.1

Unpacking

and

Inspection

••.

.•

••

•.••..

2-1

2.2

Power

Requirements

•••

...•...•.•..••

••••

• 2-1

2.3

Installation

With

the

Model

763

.••

•...

• 2-1

2.4

Model

704B

Remote

Readout Panel

Connection (Optional)

...•.•..•

•••

2-1

2.5 Subcarrier-Off

Alann

Connection

...

•.

.•

2-2

OPERATION

3.1

3.2

3.2.1

3.2.2

3.3

3.4

3. 5

3.6

3.7

3.7.1

3.7.2

3.8

3.9

3.10

3.11

3.12

General

...

.......

....

...

.......

. 3-1

Controls, Connectors,

and

Indicators

.•.•

•. •••

...•..••

.••

•

3-1

Front

Panel

•.

. .

.•

••

••.

•

...•

. ••. ••••

•.

3-1

Rear Panel.

. . . . .

...........

...

......

3-4

Turn-On

and

Wann-Up

.•

••.••.•..••.••.

••

.•

3-6

Main

Channel

Calibration

•••

•.•

. ••• •

••••

• 3-7

SCA

Injection

Calibration••

•••

•

•••

•••• •• 3-7

SCA

Modulation C

alibration

...•..••.••

. •. 3-7

Measurement

SCAModulation

and

Main

Channel

Modulation

Using

the

Modulation Meter

•••

•

•.•••

3-8

SCA

Modulation•• .

..•

•••.•••..

•

.••••

•

••..

3-8

Main

Channel

Modulation•• . •••••••

•••••

. . 3-8

Measurement

SCA

Modulation

Using

the

Peak

Flashers

.••..•

•

••..•

3-8

Measurement

Injection

Using

the Modulation Meter

•••.•

•. •• 3-9

Audio

Output. .

..•..

. •

..••••.

.....

• 3-9

Subcarrier-Off

Alann

...

.••

.•

...•.••.••

• 3-9

Model

704B

Remote

Readout Panel

(Optional)

•

.•.

••

.••.•.•

•

.•.•

••. .•

•.

3-10

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SECTION

TABLE

CONTENTS

(Continued)

OPERATION

(Continued)

Page

3.13

Using

the

Wideband

Input

for

SCA

3.13.1

3.13.2

3.13.3

Measurements

.....•.•••••....•..••.•

3-10

Calibration

Wideband

Input

Level

.•..•.•...•..•••••••••••.•..••

3-10

Reading

SCA

Injection

with the

Broadband

Input

...••.••..•..•••••.•

3-10

Reading

SCA

Modulation with the

Wideband

Input

••.••••.••.•••••.••.•

3-10

THEORY

OPERATION

4.1 General

Block

Diagram

4.1.1

4.1.2

4.1.3

4.1.4

Discussion

.•..•..•.••.•..•••••••.••

4-1

Main

Channel

Monitoring

•.•.•••••.•.•••••

4-1

SCA

Injection

Monitoring

•.••••••.•.••.••

4-2

SCA

Modulation Monitoring

•.•.•..•••••...

4-2

Calibration

Circuits

•.•...••.••..•.•...•

4-3

MAINTENANCE

5.1

5.2

5.3

5.4

5.5

5.6

5.7

5.7.

5.7.2

5.7.3

5.7.4

General

••••.•...•.••••.•.•...•••••.••.••

5-1

Access. . •••. . . •. •. •. •. ••••••. . . . ••. •. •.•

5-1

Periodic Maintenance

••.•..•..•..•..••.••

5-1

Main

Channel

Modulation Accuracy

Check

•• 5-1

SCA

Injection

Accuracy

Check

.•••••.•••••

5-2

SCA

Modulation

Accuracy

Check

•..•••••...

5-3

Troubleshooting Guides.

••••••

•..•••.•..•

5-4

Instrument does not

work

any

mode

Main

Channel

(L&R)

does

not work, but

SCA

Injection

and

modulation

work

SCA

Injection

does not work, but

main

channel

(L&R)

does

work

SCA

Modulation does not

work

but

SCA

Injection

does

SCHEMATIC

DIAGRAMS

6.1

Block

Diagram

6.2 Front Panel

and

Chassis

Wiring

6.3 Rear Panel

Wiring

6.4

Meter

Amp

Board

(Al)

6.5 Discriminator

Board

(A2)

6.6

Mixer

I.F.

Board

(A3)

6.7

Power

Supply &

Main

Channel

Amplifier

(A4)

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SECTION

GENERAL

INFORMATION

General Description.

The

Model

730A

SCA

Monitor

nonna

used in

conjunction with the

Model

763

Modulation Monitor to monitor the

characteristics

the

SCA

transmission in

broadcasting.

can also

be used for recovering the

SCA

information in the composite signal used

broadcasting.

The

Model

730A

measures

SCA

injection

level,

SCA

modulation percentage,

SCA

signal

-to-noise

ratio

and

crosstalk

. T

desired function

selected

front-panel pushbutton

itches. A

six-

position,

pushbutton-selectable precision

attenuator

also

provided

for

use in

making

these measurements.

SCA

injection

and

SCA

modulation

are

indicated

a front-panel meter.

SCA

subcarrier

frequency can

measured

the

six-digit

counter

the

Model

764

external

counter.

The

Model

730A

can monitor

either

two

SCA

carrier

frequencies

kHz

selectable

front-panel pushbutton

switches. Other

SCA

frequencies

are

available

special orders. Also,

either

+ 4

kHz

+ 6

kHz

can

selected

front

-panel pushbutton

switches-as the deviation

that

represents

100%

modulation.

1.2

Other

features

the

Model

730A

include:

Digital ly

settable

peak

modulation

flashers

that

display

positive

and

negative peaks simultaneously.

Built-in

calibration

circuits

for meter

and

peak

flashers.

Outputs

for

Model

7048

Remote

Meter

and

Peak

Flasher

panel

and

SCA

subcarrier

alarm.

Specifications.

SCA

Subcarr

ier

Frequency

kHz

and/or

kHz,

pushbutton

selectable

SCA

Fregu·

ency

Measurement

The

selected

SCA

signal

filtered

and

returned

the

frequency counter input

the

Model

764

Presel

ector

and

displayed

the

6-digit

digital

readout.

Signal Input Requirement

Accepts composite signal

from

Model

763

, 0.5 V

RMS

for

100%

modulation reading.

1-1

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1.2

(Continued).

Main

Channel Modulation measurement

Deviation

for

100%

......•.....••••.••.•..

Modulation Accuracy,

kHz

•

•...

Out

Band

Rejection,

kHz

••

+75

kHz

+4%

SCA

Injection

Accuracy

(30%

1%)

....

•

.•..•.•....

.•

•

•.

+0.si

SCA

Subchannel Modulation

Measurement

Meter

Deviation

for

100%

.••.••.•.•••..•..••.•.•

Carrier

Frequencies

.••••...•.•.•••..•.•••••••.••••••••••••

•••••••••••••••••••••••••••••••••••••••

kHz

(standard)

kHz

(optional)

Modulation Accuracy

(OdB

Meter Attenuator Switch Position)

kHz,

100%. •

••••

•••

•••••

••

•••••••

•

•••

Frequency Response

Composite

Inp

kHz

..•

••

•..•••

•••••••

••••

7.5

kHz

•

•••

••••••

.•••

•••

••

Wide

band

Input

7.5

kHz

.•.•••••.•....•.•••.

Selectivity

(Composite Input)

Narrow

+ldB

+2dB

BW,

••••••••••••••••••••••••••••

BW,

••••.•••••••••••••••..••.••

kzH

(typical)

kHz

(maximum)

Wide

BW,

•••

•..•

••••••.

•

•.

••••..•••••

BW,

••••.••••••••••.•..••••.•••

kHz

(typical)

kHz

(maximum)

Scal e

Range

.•

•.•••..•

.•••

•

•••••••••••

••

Attenuator

Range

••

•..••

••..•••

•

•••••

•

•••

•

1-2

40%,

133

% (-2

to+

dB)

-50

steps

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1.2

(Continued).

Crosstalk Rejection (Composite Input)

Main

Channel

(50

kHz)

into

SCA

Subchannel

{Narrow)................

Stereo

(23

kHz

kHz,

excluding subhannonics

SCA

Subchannel)

into

SCA

Subchannel

(

Narrow)

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

SCA

Subchannel

into

Main

Channel

•....•..

SCA

Peak

Modulation

Indicator

Range

•

..•.••.••.•••.•

••

.•

..•.....•.•.••

129

Resolution

.••.••

•

...•.•.....•••.•.•..••

Accuracy.

.•.....•........•.....•..•..

•..

+10

Response

Time

••••.

.••

••

.•.

•••

••••••

••••• 1 cycle

kHz

SCA

Modulation

and

Injection

Level

Calibrator

Outputs

Built-in

modulation

and

injection

level

calibrator

for

calibrating

the modulation meter

and

the

positive

and

negative

peak

flashers

from

the

front

panel.

SCA

Subcarrier

Level,

SCA

Injection

•••.••.•

SCA

Subcarrier

Alarm

.•.••••....••••...••

500

mV,

nomi

into

ohms

Contact closure

when

subcarrier

below

muting

evel

Audio

(with

without de-emphasis, 75/150 u sec)

Level

(600

ohms),

100%

modulation,

400

nominal...

....

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

2 V

RMS

(8.2

dBm)

Distortion

Composite input

kHz

400

Hz.

.......

1.5%

kHz

400

Hz.........

Wideband

input

kHz

400

Hz.........

0.5%

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1.2

(Continued).

Power

Noise Level,

relative

to 6

kHz

deviation (with de-emphasis)

Composite Input,

Wideband

Input.

R.F. Input

••••.•••••••••••

115/230 _

~10%

VAC,

400

Hz,

watts

maximum

Physical

and

Environmental

Operating Temperature

••••••••.•.•••••••

•

.•.••

Size

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

.......

Wei

•

••.•.•..•..••••••••.•..•.•.•.•••••.•..

Accessory Equipment

-66

-55

high x

19"

wide

x 16"

deep

Approx.

lbs.

1.3

1.3.

Model

704B

Remote

Meter

and

Peak

Flasher

Panel.

Duplicates meter

and

peak

flasher

readings

the

Model

730A.

Fifty

feet

cable

and

plug provided.

1-4

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1.4 Warranty.

TIME

FREQUENCY

TECHNOLOGY

INC.,

warrants each

the

instruments

its

manufacture to

produced

meet the

specifications

delivered

the

BUYER;

and

free

from

defects in material

and

workmanship

and

will

repair

replace,

its

expense,

for

a period of

one

year

from

the date

delivery

equipment,

any

parts

which

are

defective

from

faulty

material or poor

workmanship

Instruments

found

defective during the warranty

period shall

returned to the factory with

transportation

charges

prepaid

BUYER.

expressly agreed

that

replacement

and

repair

shall

the

sole

remedy

BUYER

with respect

any

nonconforming

equipment

and

parts

thereof

and

shall

lieu

any

other

remedy

available

applicable

law.

All

returns

the factory

must

authorized

the

SELLER,

prior

such

returns.

Upon

examination

the

factory,

the insturment

found

defective,

the

unit

will

repaired

and

returned

the

BUYER,

with

transportation

charges

prepaid

SELL

Transportation charges

for

instruments

found

defective within the

first

thrity

(30)

days

the warranty period will

paid both

ways

the

SELLER.

Transportation charges

for

warranty

returns,

wherein

failure

found not

the

fault

the

SELLER,

shall

paid both

ways

the

BUYER.

This warranty does not apply

instruments which, in the

opinion

the

SELLER,

have

been

altered

misused.

OTHER

WARRANTY

EXPRESSED

IMPLIED.

TFT

NOT

LIABLE

FOR

CONSEQUENTIAL

DAMAGES.

1.5

Claim

for

Damage

in Shipment.

Your

instrument should

inspe

cte

and

tested

soon

received.

The

instrument

insured

for

safe

delivery.

the

instrument

damaged

any

way

fails

operate properly,

file

claim with the

carrier,

insured

separately,

with the insurance

company

SINCERELY

PLEDGE

OUR

IMMEDIATE

AND

FULLEST

COOPERATION

ALL

USERS

OUR

PRECISION

ELECTRONICS

INSTRUMENTS.

PLEASE

ADVISE

CAN

ASSIST

YOU

ANY

MANNER.

Time

&Frequency Technology, Inc.

3000

cott

Street

Santa C

lara

95051

408-246-6365

1-5

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