Wavetek 1503, 1403 Service manual

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CONTENTS

SECTION

1.1

1.2

_

1

GENERAL

INTRODUCTION

SPECIFICATIONS

INFORMATION

1.3 OPTIONS

1 .4 ACCESSO

_

SECTION

2

INTRODUCTION

2.1

2.2 MECHANICAL

ELECTRICAL

2.3

SECTION 3

-

INSTALLATION

OPERATING

R IES

INSTALLATION

3.1 INTRODUCTION

3.2

3.3

3.4 TYPICAL

3.5 OPTION

3.6 OPTION

3.7

3.8

3.9 SPECIAL

3.10 COMBINED

SECTION

4

DESCRIPTION DESCRIPTION

SCOPE

AND

OPTION PROGRAMMING

_

CIRCUIT

OF

OPERATING

B

LOCAL

-

_

AUTOMATIC

C

INDICATORS

_

E

AUTOMATIC

OPERATING

1403/1503 DESCRIPTION

4.1 INTRODUCTION

4.2 SII\4PLIFIED

4.3 POWER

4.4 SWEEP

4.5 SWEEP

4.6 SWEEP

MARKER

4.7

4.8 MARKERS 4,9 OPTION

OPTION C

4.10

AND SCOPE

4.11 OPTION

SECTION 5 - MAINTENANCE

INTRODUCTION

5.1

SERVICE

5.2

PERFORMANCE CHECKS

5.3

BLOCK

SUPPLY

DRIVE OSCILLATOR, OSCILLATOR,

(M2E-21

ADDER

(M6)

B - L.O.

AUTOMATIC

-

INDICATORS

E

-AUTOMATIC

INFORMATION

5.4 CALIBRATION

5.5 TROUBLESHOOTING

_

SECTION 6

6.1

6.2

ÉX*

SECTION

REPLACEABLE INTRODUCTION MANUFACTURERS

PARTS LIST

_

7

SCHEMATIGS

7.1 INTRODUCTION

7.2 SCHEMATIC

SCHEMATIC

7.3

***

SCHEMATICS

NOTES

INDEX

INSTRUCTIONS

FRONT PANEL

PANEL

REAR

SET.UP

OSCILLATOR

LEVEL

FREOUENCY

NOTES

oPERATION

DIAGRAM

(PS7)

MODEL MODEL

(M5D}

TRACKING

LEVEL

(M8E)

FREOUENCY

PROCEDURE

PARTS

CODE

1403 1503

(M7E)

TRACKING

(MgJA)

(M9S.1}

(M11E)

CHANGE

INFORMATION,

IF ANY,

IS LOCATED

AT THE

REAR

OF THIS MANUA

SEITION

1.1 INTRODUCTION

Wavetek

The

electronically

the 1 to 300 MHz

They

are

vision

tuners and

(1

VHF

the UHF

An important feature of these instruments is their ability

be remotely

generator

sweep cedure

instead

The

automatic operation. Simply stated, in automatic

tion,

are

with

of

instrument's most

the

automaticaily adjusted

tuner. This

alignrnent

Included with the automatic options

provide

that directly

Models 1403

swept

and tuned Sweep

450

and

designed especially

receivers.

to 300

(450

sweep

MHz) range

to 950

controlled and

to

pushbutton

manual

procedure.

tuning and

generator's

provides

both

frequency

MHz) range.

be sequenced

switches

outstanding options

considerable time

1503 are all-solid-state,

and

950 MHz

to

for

testing and

Model 1403

The

while the

programmed.

or

adjustments.

frequency

follow

to

RF

and

on the oscilloscope tube.

Generators covering

frequency

Model 1503

This enables the

through

electronic sequencers,

RF output

and

variations of the

the

saving

scope

are

output

Additional

ranges.

aligning

covers

the test

those of

are

opera-

during the

indicators

indications

options

tele-

the

pro-

level

GEt\|ERAL

include up to

frequency or harmonic type)

single

tracking markers.

By

the

1503 may

independent frequency

a single set of scope operated

oscillator tracking

to

frequency

All optional

generator,

sweep

optional

allows

purchase,

of

concept offers

dated

and additional

nomically added as

ictate.

d

Maintenance

stocking of

patts.

crete

to a

cut

performed

be

eight

use

special combiníng

of a be operated as

as an automatic

options

features,

have

features

or customer-installed at a

protection

problems

several

Servicing

fraction

relatively

by

INFORMATION

crystal-controlled

a combination

output amplitude

and

horizontal and

instrument, one

markers, automatic

provides

new

well

as

plug-in

to be

against

features

tuner

control

as

modular construction.

factory-installed at

designs and test

can be

modules instead

of

time

the time

of

defective

a

previously

inexperienced

RF

and local oscillator

cable, Models 1403 and

vertical

level,

of both

the circuits

obsolescence,

can be

greatly

simplified

of

instrument

required, and

technicians.

markers

unit

(either

providing

controls with

cables.

set of

automatic

and

instruments.

for

the

the time

later date.

since

simply and

procedures

by the

hundreds

of

can

When

local

basic

This

up-

eco-

dis-

be

can

1.2

SPECIFICATIONS

1.21 RF

Frequency

Blanking

Amplitude

Step Attenuator

Flatness

lmpedance

1.2.2

SWEEPSPECIFICATIONS

Sweep

OUTPUT

-

Rate

Width

Range

-

*

Accuracy

-

1

to 300

450 to 950 MHz

Retrace blanking of

Continuously adjustable

35 dB in 5 dB

10.5

dB

(Model

11

dB

10.25

dB

75 ohms

ohms standard,

50

line frequency

AC

5 to 300 MHz 5 to

500

(Model

MHz

(Model

steps

(Model

1403)

1503)

(read

with

standard,50

75

(50 -

(Model (Model

MHz

plus

negative

1403)

1503)

RF

the

ohms optional ohms optional

1403)

1503)

output

+57

from

20 dB vernier.

60

to

detector)

Hz)

provide

to

+2

dBmV

(Model (Model

(.7

1403)

1503)

zero level

a

VRMS

to 1.26

base

mVRMS)

line.

Display

Horizontal

Linearity

1.2.3 REMOTE

Frequency

Sweep Width

1.2.4

Output

MARKERS

Type

Accuracy

External

Level

-

Output

-

PROGRAMMING

-

Marker Input

-

!2o/o

(symmetrical

Vpp

16

The rear-panel REMOTE control

May be remotely

low frequency

May be controlled

May

(-18

frequency,

of

band end and

be remotely

V corresponds

programmed

by a

programmed

to

ground)

about

jack

sweep width, and output level.

remote

maximum

Birdy by-pass. Provision for

external

monic

10.005%

Rear-panel

a birdy marker. lnput leve"i

marker

(comb)

type.

BNC connector accepts external

input.

(See

Markers

Options A-1

:

provides

by a

+16

potentiometer.

over

output).

8

necessary

116

V

high frequency

to

a 20 dB range

plug-in

marker modules

V

may be either single

A-2.)

and

100 mV into

50 ohms.

connections for remote

(-16

signal

CW signal

V corresponds to

end).

band

with a 0 to

plus

frequency

for

conversion to

-18

V signal

rear-panel

or

har-

7-2

Marker

Màrker Width

Size

-

Adjustable from

Approximately

approximately 3

400 kHz

(wide),

mVpp

100

kHz

Vpp.

to 3

(narrow).

1.2.5 GENERAL

Requirements

Power

Dimensions

knobs,

Weight

1.3

oPTIONS

(including

feet)

and

screw

heads,

1151230 VAC

(5

cm

5/8

(13314 (8

1/4

14.3

34.9 cm

20.9

lbs. net

20

lbs. shipping

25

(approximately

Ì10%

in.) high

in.)deep

in.)

wide

20

W)

50'60

Hz.

A-1

A-2

B

lF Input

Frequency

Minimum Level

Single

Harmonic

special order)

Frequency

Marker at

Local Oscillator

output

frequency

local oscillator

two

any

be

addition

28 to

of a capacitor,

47 MHz

Approximately

(Z

in

= 50

ohms).

marker

1, 10, or 50

intervals.

Tracking

from a tuner.

frequency. and

frequencies

'l

mV

Automatic Level Control ment of the RF output

under test. Also

tuner

frequency and

center

A 70 dB 35 dB

range

'Step

C

(10

(5

dB/step)

(7570-01,

Attenuator

may be somewhat

dB/step)

RF

Step

Model 1403;

increment is doubled, the automatic

reduced.

at any

generates

These markers

tracking

within

a

(0.01

level

provided

output

the

channel-center

mV

Scope Indicators

And

to correct

are level

Attenuator

Attenuator to

5070-01,

frequency within instrument

(other

MHz

two

(module

lF input

RB Probe) at lF lN connector

with

visual

(module

is

provide greater

Model

frequencies

pulse

markers based

indicate

M7E). The

RF

frequency range.

pulse

be added

can

provides

automatic adjust-

for variations in the

to

of the

replace

indications

|MSE).

available

RF

1503).

NOTE: Since the

level range of

available

on the

bandwidth,

markers can

if desired.

gain

instrument's

the

output

range.

With

of the

standard

level

Option

on

lF

the

1.4

ACCESSORTES

1.4.1 FURNISHEDWITHINSTRUMENT

.1.4.2

AVAILABLE AT EXTRA

COST

Automatic

test,

display

lnstruction

Spare

Wide Band Detectors:

D151

D171

Frequency enables

maintaining the

(Module

plug

(50

175

Manual.

with

ohms, ohms,

M11E).

pins

instrument to

the

demodulated response at

NOTE: Option B is

I

for remote

up

to

up

to

programming

1000 MHz) 1000 MHz)

track

the

the center of the

required with

(mates

with

REMOTE

tuner

Option

under

scope

E.

jack).

1-3

-{

RB Probe

Model

mum lF input

(Kl02)

Service

Kit

provides

level

additional lF

for

Option

contains module extender

B

from

amplification to extend

1 mV

to

0.01

and

mV.

RF

extension cables.

the

mimi-

2.2.41.

to four

(K103)

(K104)

Cabinet additional marker

Rack

Mount Kit

(see

Section 2.2.31.

Rack

Mount Kit

(see

rack

Section

Additional

allowing

up

Marker

Combining Harness

lmage Test

a tuner.

module

mounts

(K105)

(K106)

(M112A)

single instrument

one or two instruments

mounts

enables

to

modules

combined

checking

the instrument

(Options

into 19 inch rack

into 19 inch

A-1, A-2).

1403/1

503 operation.

image rejection

the

top cover

of

r-4

N

SEITI

O

INSTALLATION

INTRODUCTION

2.'I

This

section

Wavetek

information

mounting,

2.2 MECHANICAL

provides installation

503.

Models

and

1403/1

mecnanical

on

electrical

installation.

INSTALLATION

2,2.1 INITIALINSPECTION

After unpacking

parts

for

damage to knobs, connectors,

The

shipping container

saved in case it

2.2.2

lf

notify

sentative or the

Retain

carrier's insoection.

The local

arrange

without waiting

2.2.3

CONTENTS

ITEM

A

B C

DAMAGE CLAIMS

the instrument

carrier and

shipping carton and

representative or

for

either

RACK MOUNTING

(See

(Side)

(Side) (Screw)

instrument,

the

and

is necessarv to reship the

received has been damaged

either the

factory in lndiana.

replacement or repair of

for

damage claim

Figure

2-1).

The

installation,

visuaily inspect

packing

nearest

packing

factory will

the

settlements.

(K103

SINGLE

OTY

1 1

I

instructions

ìncluding

surface

material

unit.

Wavetek

area

material

immediately

your

instrument

KIT}

PART

8000-608

C000-691

HS101-806

for

the

include

rack

external

etc.

areas,

should

in transit,

repre'

for

the

NO.

be

PROCEDU

Remove the screws

B against

screws

and

desired side of

2.2.4

CONTENTS

ITEM

(Tray)

A

(Side)

B

(Handle)

C

(Screw)

D

(Screw)

E

PROCEDU

Install

10-32 x 5/1

Position the

feet

are

secure

lf the

the

Rack Mount

The

'10-32

Mounting

ment

RE

panel

side

provided.

B may be

interchanged

rack.

RACK MOUNTING

(See

R E

both sides

6

thrust

instruments on the trav

extend

properly

bail

into the

seated,

with

the

instrument

must be

Kit.

handles

x 1i2

rear-panel connectors,

(item

binder

holes

are

from

one

of the

Repeat

Figure

(item

remainìng

being

removed

for

2-2).

B) to

head screws

holes in the

install the top

NOTE

mounîed

prior

are

C)

head

screws

provided

panel,

side

instrument

other side

position

to

(K104

OTY

2

12

4

one tray

tray.

thrust

Mount

and

unit.

of

instrument

the

DUAL KIT)

(item

so that the

When

the

(other

tray

head

screws

D)

is equipped

installation

to

(item

to the sides

E).

fastened

for front mounting of

if desired.

A or

item

with

secure

ltems

on

PART NO,

c000-729 c000-730

HH 101-002

HS106-905 HS103-908

A) using the

provided.

instrument

instruments

item A) and

(item

D).

with a bail,

in the K104

with the

instru'

A

a-r

Ll

f--

a--

oraa

F'igure

2-1.

K103

Rack Mount Kit

ELECTRICAL

2.3

INSTALLATION

\

c

\\\

)/

\

z/t

'\ì(

o

X à',

--\rP€

"

.yll

Figure ?-2. KK104

2-2

ót

Models 140311503

VAC supply

230

L

tl

selects

and ad

Supply

of 50

which of these

justs

is designed to

H-2.

or 60

lnstruments VAC operation

can operate

mains. The

operating

Power Supply accordingly.

the

operate

shipped

ae

unless otherwise

from the

"

instrument,

FUSE is the correct

3.3).

Rack

Mou

nt

Kr't

Before

panel

voltage

operating the

AC LINE

(see

Section

from either 115

rear-panel

at an

specified.

NOTE

AC LINE

voltages

AC supply

factory set

check that

value for the

VAC or

SWITCH

is being

The

frequency

for 115

up

the

used,

Power

rear-

supply

SECTION

3.1

INTRODUCTION

This

tion,

for

the

section

operating

provides

Wavetek

instructions,

Models

3.2 DESCRIPTION (1)

quency (manual

operation),

{21

ment

(3)

of

(manual

operation),

(41

tude.

is

(5)

A-1

FREOUENCY

when

the

operation).

this control

ATTENUATION

RF

of the

the RF

When

output in

LEVEL

output

operation). When

this control is

MARKER

the knob is

reduced.

MARKERS

and A-2 markers

control

when

pushbutton).

complete functional

programming

and

140311503

OF FRONT

control

sweep

PANEL

adjusts the center

AUTO FREOUENCY

When

this switch is up

is

inactive.

control

5 dB increments from

provides

the AUTO

inactive.

SIZE

control

pulled

pushbutton

(marker

provides

20

dB

LEVEL

this

switch is up

adjusts the marker ampli-

out, the birdy marker width

switches control Option

frequency is

OPERATING

(10)

modulated

control

generators.

switch

calibrated adjust- when

vernier adjustment for

descrip- RF

instructions

fre-

is down Option B or

(automatlc

to 35d8.

0

is down

switch

(automatic

engraved on

quency This

circuits of Option

(1

t18

(121

from

(13)

3.3 DESCRTPTION (1)

from either

(21

AC mains via

(3)

VAC operation,o.25

DEMOD

swept signal from

markers

may

and level indicators

signal is

1

)

V to

also

PROBE POWE

power

C.

lF INPUT

the device under

Option B is installed.

RF

OUT connector

RF

the

output signal.

AC LINE

115 VAC

AC

LINE INPUT

prong plug.

3

AC LINE FUSE

IilSTRUCTIOHS

lN

connector

be added,

used

to control

C.

R

connector

an external

connector

test to

OF REAR PANEL

SWITCH enables

or 230 VAC

is

for

amp

(BNC)

the device under and also when

probe

(BNC)

generate

(BNC)

cord

time-delay;

230 vAC

adds the

Option

the automatic RF level

(BNC

if needed for use

accepts an

lF

provides

instrument to operate

mains.

supply

provides

0.5 amp

operarion.

accepts the de-

twinax) supplies

tracking

test so that

scope fre-

provided.

is

C

with

lF sample

markers

connection

connection to

for

11b

(6)

width

range.

width

quency

l7l

Supply.

(8) a 16 Vpp

horizontal

(9)

combined

scope frequency

stalled) for

SWEEP

from

less

When

the knob is

is reduced

range'

POWER

pilot

The

SCOPE HORIZ

triangle

input.

SCOPE

demodulated

connection

WIDTH

than 5 MHz

conrrol

to the entire

pulled

to approximately

switch

light

VERT

and level

applies AC

indicates

OUT connector

waveform

OUT

connector

RF

and

indicators

to the oscilloscope vertical

adjusts

out,

the

10%

power

the display

frequency

swept

maximum

of the swept

to the

sweep

fre-

Power

(4)

programming

(b) (o)

an

OPTION mounting

EXT

external

operation. the display.

(BNC)

provides

to drive the oscilloscope

(BNC)

marker

when Option

signal

provides

(and

the

also the

C is in-

inout.

(71

provides positive

is installed.

(8)

negative

amplitude of

,PULSE

pULSE

frequency

of

jack

REMOTE

MARKER lNpur

CW signal to

MARKER

or negative

MARKEB

positive

or

pulses

the

plug

RF

provide

output

and

hole

connector

produce

a

OUTPUT connector

pulse

markers

SIZE swirch

marker

from

pulse.

0 to more

connections

level.

for BNC

(BNC)

frequency

when Option

selects either

Control

than 30 V.

for

connector.

accepts

marker on

(BNC)

B

adjusts the

a;\

\

AUTO FREQUENCY

.aY

ae

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Siz"

,ry-,."3

Pow€R uonrz-{p-venr

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ATTENUATION

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Front Panel

Rear

Panel

l4O3

or

l5O3

PUTS€

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oul

(reor)

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of

ing

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3-3.

DEMOD

Dclector

R

HOR

I

VE

TYPical

lZ

Test

Set-uP

VERT

HORIZ

75

ódB

TO 5O

75

MATCHING

ohm

PAD

MATCHING

300

TO

5O

Figure

120

m

oh

PAD

3-4.

ohm

5O

PAD

Typica'l

ódB

75 TO 300 ohm

"

MATCHING

Resistive

120

PAD

Pads

ohm

PAD

3-3

i

d

3.4

TYPICAL

When

initially

panel

AC

LINE

ment

is

set for

When

Option

Sections

required

and

AUTO FREOUENCY

pleting

Make

connections

under

test

Since hum,

kept

at a minimum,

ground

and

Coaxial

possi

ever

The

RF

characteristic

generator. (under

3 feeti.

characteristic

input

signal

impedance irnpedance, between

to

mask

device

under

a matching

3-4)

or

a transformer

the resistive

sertion

connecting should

be

C

3.6

and/or

proper

for

the

set-up for

and

RF leakage.

be

cables

ble.

output

impedance

The

impedance.

to

of

the

but has

6

10

to

this input

test

network

pad

loss

than

the

as short

OPERATING

setting

up instrument,

SWITCH

operation

and/or

Option E

3.7 for

operation.

manual

between

the

oscilloscope

and spurious

it

is essential

maintained

with

BNC

connectors

cable is

cable

This

especially

should

cable

This insures

the device

device under

high

a

dB)

can

be installed

mismatch.

is not

the same

is used. Either

matching

is

simple

to construct,

the balun-type

output

of

the

possible (under

as

SET-UP

FUSE

and

with

the

adjustment

Be

switches

operation.

the sweep

as shourn

throughout

identical

be

kept

must

also be

under

test. lf

test is

VSWR,

lf

the input

as the

network

pad

first

check

to ensure

available

are

to be used, refer

of internal

sure

the AUTO

are down

generator,

in

pickup

signal

good

that

the entire

should

critical.

to that

a

as shown

a

transformer.

to

the

1

be used

lt must

of

as short

terminated in it's

a constant

the nominal

the

same

pad

fixed

impedance

cable's

resistive

may

be

provides

it

device under

inchl.

rear-

the

the instru-

mains.

AC

controls

LEVEL

before com-

the device

Figure

must

connections

set-up.

wher-

nave

the sweep

practical

as

amolitude

input

as the cable

(normally

Figure

in

of the

impedance.

(Figure

pad

used. While

more in_

The

leads

test

3-3.

be

3-3

precisel.T

is to the lF

signal to

must

to

contained

either factorv-

SET.UP INSTRUCTIONS

For

low-impedance pick-up

wound

reference

signal

For

from

sample resistor

a

When

be supplied

signal can

of

the detector,

external sample

the

under greater

to

trapped frequencies,

frequencies

The lF

set completely

of this

justment.

determining

accomplished

output

Option E

be installed

entirely

or field-installed.

receiver

applications.

on

a Yz

to the receiver's

pick-up

tuner

is

obtained.

applications,

a high-impedance

in

Option

probe

test

the device

B is used,

to

provided

be

probe.

provided

is

used,

is 10

operating

are trapped

Adj

control

clockwise.

module,

the front-panel

The

under

the local

producing

by

signal.

This

(Automatic

when

Option E

plug-in

in

the lF

coil, normallv

inch

form.

the lF

source such

the detector

an

directly from

from

or

the lF

probe

by

the detector

the required

pV

instead

range

of

the marker,

test.

the lF

out.

on top of

Because

this

control

oscillator frequency.

markers

option

Frequency),

also

which

provides

is used.

module

sample is

M7E,

2

The

coil is

lF

amplifier until

sample is

shown in

lF

signal

lF

is

used

lF

1

of

lf lF

pickup

the

seldom

typically

as

Figure

'l

of

mV

lN

connector. This lF

the lF

amplifier

only

when insufficient

(see

input

mV.

This

and

markers

must

occur

M7E

module

of

the large

requires further

are related

the input

and therefore

This

option is

and can be

obtained from

or

3 turns air

positioned

sufficient

obtained

the

2.2 kS,

3-S.

more

or

sample output

contained in

Figure

from

provides

looser

must

3-3).

the device

for

coupling

are desired

before the

should be

AGC range

This

a

with

lF

an

lf

a

at

ad-

After

the RF

of

the

device

before

being

scope

vertical

the

detector

while

in

aligning

(see

Figure

the DEMOD

After

completing

The

lamp

This

instrument

immediate

(down)

for

positions

the required

amplitude.

marker

3.5

The

amplitude

OPTION

purpose

3-4

swept

under

connected

input.

is

already

3-3).

lN

connector

should

use.

Turn

B_LOCAL

of

signal

test. it

In

a tuner,

The

the

light,

requires

both

and

center

on

the desired

and

width

this

passes

must

to

the DEMOD

the

case

provided

an external

detected

on

the front

set-up,

indicating

no

warm-up

AUTO

adjust

the

frequency,

needeci.

as

OSCILLATOR

option

is

through

be

detected

lN

of

TV receiver

part

as

a

detector

signal

is

panel.

switch

the AC

an operating

s.witches

sweep

markers

provide

to

the RF

connector

circuits

idemodulated)

or tne

alignment,

of the receiver,

then

must

connected

be

used

power

condition.

and is ready for

to

generator

width,

and

TRACKIf{G

manual

their

controis

and output

adiust the

a method

to

on.

of

Connect

nector MARKER

modulation

An

markers

the

OUTPUT

the rear-panel

to the

SIZE

on the

alternate

is

as differentiated

connection

to

the scope

oscilloscope

method

The front-panel

provide

Pulse

the desired RF

Size control iocated

3-6) is adjusted

pulse

lF

MARKER

the amplitude

The M5D

marker

SIZE

of

Pulse

counterclockwise

controls

oscilloscope

of

from

the

Z-axis

MARKER

in

clockwise

a

amplitude

control

RF

the

Size

control

when

PULSE

Z-axis

produce

to

MARKER

input.

the desired

trace.

displaying

vertical

pulses.

rear-panel PULSE

(intensity)

SIZE conrrol

birdy

marker

on

the M5D module

amplitude.

direction until

is obtained.

will

now

simultaneously

birdy

and

the lF

NOTE

should

be

the intensity

OUTpUT

Adjust

the

the L.O.

For

this

MARKER

input

is omitted.

is

adjusted to

(see

the desired

The front-panel

pulse

turned

completely

markers

are used.

con-

pULSE

intensity

Tracking

method,

and

the

Figure

adjust

markers.

IF

INPUT

FROM

TUNER

INJECTION

METE R

O-5ma

20JL MA

LOW PASS

X.

Figure 3-5. Typical

FILTER\

IF

SAM

PL E

+

75

Detector

DETECTOR OUTPUT

too

ADJ

SIZT

OUT

@@o

Fiqure 3-6.

@@

M5D Controls

llav:ttx

F'igure

aulo ta

3-7.

HBE

Control

s

3.6

OPTION C

SCOPE

INDICATORS

_

AUTOMATIC

NOTE

LEVEL

AND

Finally,

switch

AUTO LEVEL

control

.5 V. The LEVEL

until

the output level indicator

automatic level

to

up)

switch

control

is now

operation,

and adjust the ATTENUATION

reads

inoperative.

(front-panel

approximately

When

Option C is not

installed

The

the

scope

gain over

LEVEL

Level

and can

SET.UP

First,

must

neering

UHF

10

mV,

be

several volts.

puts

polarity.

ditional and the

sensitivity

an increase

and

signal tuners has

band RF tuner put

be used

the

1 V level.

Once

Polarity

the M8E

shift

Temporarily

scope vertical

the manual

complete

to

purpose

variation

a 20

of the

pattern

of

range

dB

control

option

is entirely

be either factory-

INSTRUCTIONS

the desired

be established.

specifications. The

tuner without lF

while the output from

between

For

gain

10 mV

detector

must

the instrument's

in

the noise level

also makes

and hum

been

amplifier in

lF

output

is more

to

the

when

than 1 V,

reduce

proper

switch

Bal

control until

the

connect

input

mode

ATTENUATION

detector

not been

DEMOD

to

vertical

Set pattern,

obtain

output from

disturb

these controls until

adjusted. Reconnect

lN connector

the

SCOPE VERT OUT

sensitivity

the M8E

and the X10

patrern

a

provided,

marker

the

Automatic Level

constant

at a

the device under

by controlling

in

a closed-loop

containéd

or field-installed.

operating level

This is

detected output from a typical

amplification

This option can

1

and

outputs of

be

added

DEMOD

of

the Option C input. however, results

an M8 module

adder

circuit.

option is to maintain

amplitude,

test. This is

the 0 to 20

system. The Automatic

in

regardless of the

accomplished

dB

plug-in

module M8E,

of the device

generally

V of

between

determined

is

in the order

lF

the

second detector

accomodate detector out-

positive

either

less

the

lN

connector. Increasing

10 mV, ad-

than

detected output

or

of the demodulated response,

the

pick-up.

achieved

set-up more

test

More

by

susceptible to stray

success in testing

installing

well-designed

a

the tuner test fixture between the

and the

input level

between

Polarity

and

RF

detector.

a simple resistive voltage

the detected

output voltage

has

positive

lf the detected out-

been set,

and negative

the display

switch is

the detector

and, with the instrument

(both

LEVEL

changed.

output directly to the

AUTO

switches down), adjust the

controls to obtain the desired

the device under

divider can

to

switch the M8E

base line does

operating in

test. Once set,

the M8E Gain controls

the detector output to the

and the oscilloscope vertical input

controls for

Polarity

height

connector.

switch

of 1 V

and

Set

the oscilloscope's

.2 V/division

to

obtain

a

the Var

(see

Figures

(DC

positive

Gain

3-7

base is

PIN diode

under test

by engi-

can

negative

low-level

wide

less than

and adjust

not

do

have

coupled).

scope

control to

3-8).

and

gain

As the

the output

of the device

level

output change required

level. The indicator is

voltage

0 V

V level indicates

graticule

mum

The M8E module

will change

frequency

Range

the

of

being used.

(before

pedestal

the Step Attenuator)

level indicates

an

can be calibrated

maximum

or

also

position

instrument

of the

and Cent controls are

entire

horizontal scan for

scope

Set the front-panel frequency

that the

right

in

Set

to

indicator

end

of

FREOUENCY

the

be used.

to

be

the

Adjust

used.

display.

the same distance in

pulse

The

cedure must

properly

Once calibrated,

position

3.7 OPTION E

This option

sweep

ment

combined

from

was

Cent

the

and Range

be repeated until

on both

any change in

or

sensitivity controls

_

provides

generator

efficiency. This

to the device under test for

frequency

duration of an lF center frequency marker. voltage

becornes the

next sweep cycle, thus keeping

display. This feature

the

module M11E,

SET-UP INSTRUCTIONS

First,

Option

lF markers

and

B, Local Oscillator

present

AUTO FREOUENCY

under

test changes. the

indicator

to

linear

a

RF

output of 1 Vp.

points

gain

provides

on the base line

FREOUENCY

Adjust

pulse

is

control

vary, indicating the

will

maintain

the

indication

RF

an

output of .1 Vp

volts,

in

(see

provided

dB,

as desired.

a differentiated

Figure

control to the

M8E Range

the

positioned

the lowest

to

the Cent control to

from

the left end

right

end in

the above step.

NOTE

controls

interact, so the above

the

highest

the

and

the scope's

will change

AUTOMATIC

automatic frequency

is

and

frequency

FREOUENCY

accomplished by sampling

program

sweep

program

response centered

the

is contained entirely

can be either factory-

Tracking, must

on the display.

switch

to AUTO. Two adiustments

height of

pattern

over a2O dB

relative

3-9). The indicator

to

the

at the

RF

of the

The oscilloscope

or

range. A

and

indicate

pulse

output

mini-

which

to the center

it to cover

allow

frequency

range

highest

control

from

position

is

in

frequency

pulse

the

positioned

slightly

of the display as the

pulse

lowest frequencies.

horizontal

calibration.

the

greater

for

The

sampled

for the

plug-in

in

installed

be

front-panel

of the

align-

tracking

voltage

fieid-installed.

or

Set

the

RF

1 V

a 1

so

the

pro-

the the

on

3-6

Volts

't.o

.6 .4

o

t-;

-

r l- 9-

I

|

-

I

t-.7-

'-

I tl-.ó-

l-i

-.5

-.r

-.2

-.t:-20

PUT

OU T

,*otltTio.

OUI PU f

Voll-s

Peok

t

''

t-

-o

-

l-ro

=-ls

dB

FTTQUENCY

NDICA T

O R

-

"

s

I

t50

FTEOUI

f

NC Y

--f-

300

Figure

123

ooo

456

ooo

789

ooo

3-8.

Level

Indicator

Figure

VOLTAGE

Pin 1

2 3

10 Sweep

CONTROL

Ílr(

aulo tlto

Soo

3-10.

AND SIGNAL

Ground +18

V

-18

V

Ramp

INPUTS

Figure

tl

M11E Control s

SOURCES

3-9. Frequency

INTERNAL CONTROLS

5

Pin 8

11 S\ryEEP

Pins

1 403

LEVEL

FREOUENCY

13, 14, 15 are

1503 combined

I

Indicatc

WIDTH

used only

operation

in

toil1?

ooo

13 14 l5

ooo

6

Pin 9

Pin 12

Output Output

Sweep

Level

Frequencg

Width

r

Pins 4, 7 are

unused.

Jack

REAR PANE[

EXTERNAL OUTPUT CONTROL

rar

lror(

I

REMOTE

I

t/

I

r\-

6\_

I

To

I

CONTROL CIRCUIT

PLUG

RFoUTPUT AMPLITUDE

VOLIS

@

z

È

F

o l

o

F

ó

-18

-t6

-t?

-to

-8

-6

Fìgure

3-I2.

FRONT.PAN

I.EVEt

coNTROL(Oro20dB)

EL

External 0utput

Control

É

o

É

ù

+?

Fì

gure

?.3.4.56.7.8.9

RF

OUTPUÎ

3-13.

PEAK

Vol tage/0utput

EXTER SWEEP WIDTH CONTROL

NAL

LO

+to

dBm

3-B

Fì

REAR

PANEL\

+18

_18

gure

?-1 A.

PANEL

FRONf'

FREQU

ENCY

CONIROL

External

REMOIE PLUG

Frequency

Control

F'igure

3-15.

FRONT.PANEL

SWEEP

CONTROL

External

I

nemorr eluc

I

V

,,,:

l-r*.r,

CONTROL CIRCUIT

WIDTH

Sweep LJ'idth

*,0*

Control

provided

are

center

the lF markers

adjustment

frequency

1403;

700 MHz, Model 1503).

the display

extreme low

on the M11E module

centers

is

when the sweep

the display when

approximately mid-band

or extreme high

3.8 PROGRAMMING

Connections for frequency.

REMOTE

bined

Model 1403/1

The

REMOTE

Figure

3-1 1.

Normal front-panel

programming

8 and 9, I 1

3.8.1

To

OUTPUT

provide

control, remove

MOTE Figure

programming

plug

3-12.

remote

and sweep

jack.

Also

jack

plug

with

12,

and

and 13

LEVEL

externai

the

and connect

The RF

voltage

operation

on the

oscilloscope display. The

The Gain

generator's

end

of its range.

control

width

provided

are

are connections

503 operation

its

and

provided

is

jumpers

and 14.

CONTROL

control

jumper

as shown

of the

from

an external

output

in

is

Figure

a

(see

Figure 3-10)

Cent

the sweep

(150

adjustment

frequency is at the

generator's

MHz, Model

centers

of output level. center

rear-panel

on the

for

com-

(see

Section 3-10).

functions

between

pins

linear

are shown in

REMOTE

by a

pins

5 and

to

0

20 dB

5 and 6 of the

control

shown in

as

function of the

3-13.

LEVEL

RE-

to

6,

3.9

SPECIAL OPERATING

3.9.1 EFFECTS

The use

can cause overloading.

present.

the device under

controls for minimum

the output

increase

configuration

lf

the

the top, proper

3.9.2

When making

ground

cables

problem.

times be eliminated

nection

the scope

to

is made

at the

pick-up.

excessive input

of

and that

amplitude until

of the

response

decrease the

configuration.

LOW_LEVEL

loops

for

carrying RF

Ground

betr,veen each instrument.

at the vertical

horizontal

FROM

the response is

test. set the ATTENUATION

output

response

of the

envelope

measurements

become

loops causing hum

horizontal

input

NOTES

OVERLOADING

signals to the device under

To assure that

output amplitude. Gradualiy

response is

a

amplitude should not

envelope except

does change,

output

just

MEASUREMENTS

at

problems.

signals helps minimize

by

completing

input. lf

input

terminal,

terminal

this condition is

a

representation of

true

obtained.

in

such

as

far

enough

to

low levels, radiation

Using double-shielded

the

pick-up

only one

This

applies

ground

the

an

additional

will

often

result in hum

LEVEL

and

increase

Further

change the

amplitude.

flattening

restore

radiation

some-

can

ground

con-

particularly

connection

ground

test

not

at

the

and

3.8.2

To

the

connect

in Figure

3.8.3

To

jumper nect

Figure

The

range

CENTER FREOUENCY

provide

jumper

provide

external

from

9

3-14.

SWEEP WIDTH

external

pins

from

12

to an external

3-15.

circuit as shown

to

300 MHz

{up

Model 1503).

to

MHz

{up

30

1503) normally

control

between width

out,

REMOTE

control.

control

pins

8 and 9

to an external

CONTROL

control

1 1

and 12

sweep

NOTE

will control

on Model 1403

To

externally

on Model 1403

activated

a 91 kohm

plug

CONTROL

of center frequency. remove

of the

frequency

of sweep

of

the

control

pulling

by

resistor

10

R

EMOTE

width

control

the wider

the

and

the

should

and the

REMOTE

50

control as shown

width, remove

and 500

SWEEP

plug

and con-

shown in

as

sweep

MHz

narrower range MHz on Model

be connected

external

and

the

width

on

WIDTH

sweep

3.î0

coMBTNED 1403/1503

Figure

3-16 shows

1403/1

The

special

This

The

connected ment

1403

R EMOTE

Both instruments have

The

Automatic

operation.

503

two rear-panel

Combining Harness

assembly

plug

adjacent

to the

designated

or 1503. The

jack

"master"

Level And

the Automatic

matic

operation,

E

installed. The

but it

would

The

AC line

lf it is not,

phase.

the typical set-up

also contains

rear-panel

as the

of the

also

Frequency

the slave unit cannot have Option

slave unit

not function

phase

must

reversing

opERAT|ON

to

REMOTE

to the

"master".

remaining

"slave"

the desired RF marker

has

Scope

be

one

plugs

are

assembly

a

(K106)

VHF/UHF

REMOTE

This

can

plug

is

instrument.

L.O. Tracking

the

Indicators

(E)

option, installed.

have

may

since there is no

the same

of the AC

Option B installed,

to both instruments.

plugs

provide

combined

removed

and a

is installed.

change

change switch is

jack

be

connected to the

(C)

switch.

of the

instru-

either Model

"A"

options.

(B)

option,

option, and

For

auto-

C

lF input.

will correct

or

the

J-v

Set-up

previously

external

and the

and operation of the instruments is identical

VHF/UHF selector switch. The

FREOUENCY

instrument

counterparts

described

inoperative,

are

on the master.

with

the

exception

of the additional

and LEVEL controls on

but can be controlled by their

AUTO switches

the slave

as

Although the AUTO FREOUENCY

inoperative, it must

automatic operation.

be

in

NOTE

the AUTO

switch

position

on the slave

proper

for

is

SLAVE

PLUG

s{-

ó

I I

t5

t2 l4

*-NC

Vu

Auto

s*itrn

Level

ó

)

9

I

ì5

MASTER

PLUG

3-

10

RF

out

Inputs

lF

Comb

vHF/U

Tuner

Figure

VERI

SamDlè

Hr

3-16. Kl06

RF IF

out

Detector

DEMOD

in in

Harness And

V€RT

1403/

HORIZ

1503

YERT

Combjned 0peration

SCOPE

HORIZ

SECTIO

N

4.1 INTRODUCTION

This section first

followed

Before

by

beginning the

be well to consider

instrument.

and circuit description

position,

thereby

overall instrument. The mechanical arrangement

seen by referring

4.2

SIMPLIFIED

The

block diagrams in

both block

within

Figure

circuits

each module

4-1

in manual

required

Figure

4-3

indicator

circuits.

presents

more detailed description of

a

This will enable

an overall block

circuit description

actual

mechanical

the

following block

diagram analysis

arrangement

to be associated with

providing

Figure

to

BLOCK DIAGRAM

and module information. The blocks

are

depicts

for

shows the automatic level control

the

operation.

automatic

better understanding

a

5-1 5.

Figures

basic

4-1

indicated

sweep

Figure

f requency

,

by the shaded area.

generator

4-2 depicts the circuits

4-2,

and

tracking

each

its

4-3

contained

and

operation. and scope

module.

it

would

of the

diagram physical

of the

can be

contain

marker

CIRCUIT

The sweep

sweep

oscillator

signal

with

DESCRIPTION

generated

is

a

UHF

hetrodyning a UHF

by

reference oscillator

CW

a diode mixer. The resultant difference signal

preamplif

attenuator

monitor

Leveling

diode, which reference

error

anrplifier

This closed-loop signal at

tude

circuits, and

resistor is connected between the

the

impedance of

The output

through

connector.

ied,

connected

to the

point.

of

the

voltage supplied

between

and

the

variations

module

wide

band amplifier, and sent

RF output is

measures the

the two voltages is amplified

fed back

is

system maintains

monitor

in

the sweep oscillator,

also

RF

Output connector to establish the

75 ohms.

from

to the

point,

creates a

M9JA

the

the Step Attenuator to the

through the

accomplished

RF

voltage and compares

by the

voltage-variable

constant-amplitude

a

compensates

which

zero impedance.

zero

module is then connected

voltage-variable

by the

LEVEL control.

in the

mixer, and amplifier

impedance

front-panel

attenuator.

for

A 75 ohm

is then

to the

monitor

it

leveler

ampli-

point

source

RF

in

to a

Any

RF

and

OUT

4.2.1

The Power and triangle wave

modules,

The

panel

generator

SWEEP WIDTH

OUENCY

sweep

conrbined into determining varactor diodes in

Necessary

provided

The

circuits

circuits in

The RF tained preamplifier, lifier,

MANUAL OPERATION DIAGRAM

Supply

and a

power

two

FREOUENCY

supplies

and SWEEP w*IDTH

drive circuits in

level

by the sweep drive circuitry.

square wave

off during

the instrument.

sweep

provides

generators

pulse

sources

regulated

marker

provide

control,

the sweep ramp

control. The

M2E-2

the

a single signai which drives the

shifting, shaping, and amplitude

generator

retrace,

generating

turns the and

circuits

in the M9JA module

voltage-variable

monitor,

and

leveler

amplifier.

118

V sources,

for

connection to

amplifier circuit.

voltage

the

while

the triangle

to the

output signal

controls are then

module where they

the Sweep

controls

for

containing a sweep

attenuator,

from the

Oscillator

R F

output and

the timing

Model 1403 are

wide band amp-

plug-in

the

to

front-panei

fed to the

frequency-

module.

control

marker

of

oscillator,

square

front-

wave

FRE-

are

other

con-

R F sweep

The

contained in the

module

tenuator,

contains a sweep

the sweep oscillator

attenuator

put

is

accomplished in the

cribed,

the module is

R F OUT connector.

The

M5D,

markei'

combines the addition' also levels the sweep

the

constant-amplitude sweep

modules, which is

and

marker circuit is

the

adder

to its marker

main RF output signal was

comb" output

modules.

in

instruments, which insures

all

installed

markers.

generating

M9S-1

monitor.

and

leveler

is fed

to

monitor

the

its source impedance is

fed

then

individual

through the

comprised

Marker

function

markers with the

adding

sample signal

extremely

f rom

the

lt also standardizes

circuìts

Sweep Oscillator module.

oscillator,

through the

point.

same

the

of

signal

important in obtaining a

harmonic

for Model 1503 are

voltage-variable at-

amplifier.

manner

of

generators

M8/M8E

scope

function.

to the

the

proper

The

voltage-variable

Leveling

50

Step Attenuator to the

of

previousiy

as

O. The

Marker Adder moduie

(M6),

module, which

vertical output.

the

in

same

the

leveled.

sweep

This

individual

generating

sample

operation

output

the

output

MSD

manner as

provides

The

from

RF out-

des-

from

the

and

module

Marker

"flat

Marker

amplitude

field-

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4-3

This

constant-amplitude

the

individual

a mixer

difference

back

with

signal,

to the

all Marker

into

a single

through

circuit

the routed

The

Tracking from are

lF

to

RF

frequencies.)

amplified

applied

rates

the

in

the M8/M8E

demodulated

to

the

M7E

Markers generated

a TV

AGC'd

sample

during

approximately

markers

in

to

the common

sharp,

sweep

M6

Marker

a crystal-controlled

which

Marker

modules

Adder

are

combined,

composite

MARKER

SIZE module

input

signal.

front-panel

or receiver.

prevent

tuner

10 MHz.

three

The

crystal

identical

provides

loss

alignment,

crystal

detector

marker

module

tuner

to

in

negative-going

sample

modules

is

the birdy

module

signal.

control

This

SCOpE

pulse-type

from

The

of

(The

filters

filter

marker

signal

where

CW

signal.

marker,

where

amplified,

This

signal is

to

where

it is

combined

VERT

an lF

conversion

markers

convert

converted

at equivalent

outputs

amplifier

pulse

circuit

pulses.

is

then fed

it

is combineiJ

The resultant

is then fed

the signals from

and shaped

then

marker

the

combined

OUT connector.

Local

sample derived

circuits, which

from

the

signal

are detected

circuits,

signal is

Oscillator

insufficient

lF

sample

generates

converted

and

which

adder

gene-

fed

with

then

and

are

to

switches

in

would have

during

voltage, would

return

would then

essentially

control

4.2.3

The

quency The module

scope

automatic

without usíng

indicator

MARKER

ulated

input.

on.

lf the

a negative

the

second half

when

turn

the FET

to the

be in

searching

pulse.

AUTOMATIC

INDICATORS

Option

C automatic

indicator

also contains

preamplifier

level

pulse

SIZE control

input

signal for

control

charge

of

transferred

switches

SWEEP

the full

the

LEVEL

DIAGRAM

circuits

control

with

external

and

the marker

pulse

did not

derived from

to the

WIDTH

sweep

full

M2E-2

off.

thus

control.

width

band for

AND

level

circuit

are

contained

high-impedance,

and

signal inverters

either high-

DC

amplifier

signals

are

combined

connection

fire,

the

pulse

a

retrace.

This

capture

opening

or

SCOPE

and

the

The

instrument

,,capture',

presence

the

level

in

module

adjustable-gain

to

or low-level

probes.

from

with

front-panel

the

The level-

to the scooe

capacitor

occuring

negative

circuit,

ground

mode,

of a

fre-

and

MgE.

permit

tuners

demod-

vertical

The

marker

provides

at

the

rear

The

marker pulses

Size

control

module,

from

the DEMOD

4.2.2

When

Option

(module

frequency which

is

of

this

Automatic

Option

to

keep

scope

display,

from

the

required level

at the

a capacitor

of

the

pulse

a

transfers

amplifier.

the frequency program

The

control

positive

a high

this

voltage

pulse

amplifier

either

where

panel.

to

circuit

positive-

the

they may

AUTOMATIC

E

is

M7E)

at the

is used

then

fed

to

control

E

the

pulse

Frequency

provides

tuner

and is

M7E

module.

inversion

of

duration

which

sweep

trace.

occuring

during

this voltage

The

output

pulse

from

level.

to the

M2E-2

lN

provided,

as

an

response

retains

4-4

circuit

output

in

the

is

pS7

or negative-going pulse

are

marker

connector.

converted

an

a separate

circuit

module.

the signal

of

The

to

ol

of

The first

fed

also

be

FREOUENCY

adding

added

one

equivalent

through

crystal

automatic

pulse

is

then

automatic

dependent

The

frequency-tuning

curve

upon

input

from

the

control

the voltage

timing

the first

pulse

half

the reference

this voltage

the

M7E

sweep

also

half

capture

circuit,

circuit

to the

tuning

centered

amplifier

follower

retrace

routed

power

to the

Supply, which

the

M5D

in

the Mg/MgE

detected

response

DIAGRAM

filter

Option

in

of the lF control marker,

amplifier.

routed

The

to the

on

the oscillo_

the control

provides

the

M2E-2.lts

pulse

is

transferred

from

generator produces

of the

input

cycle.

charges

remainder

the

retrace

of the output

then becomes

a capacitor

pulse

transfers

holding

the FET

pulse

markers

pulse

center

output

M1lE

voltage

pulse

the

output

to

which

to

THE FOLLOWING

REFERENCED

SECTION

4.3 POWER

The PS7 Power

a square

AC POWER

A

dual-primary

B

voltage plug

transformer

to reduce

Unregulated

full

plug,

to three

square

pulse

power

the

+18

Regulation

internal

+18.00

current

limiting

before

reverse

7.

SUPPLY

wave,

a

& RECTIFIER

of 115

or 230

and is

switched

is located

magnetically-coupled

plus

wave

rectifier

mounted

wave,

amplifier.

V SERIES,REGULATOR

to

unregulated

triangle

R45

indicator,

provided

is

reference.

V. An

external pass

capability,

characteristics

limiting.

voltage

by

CIRCUIT

TO THE

Supply

triangle

transformer

and

circuits

the

SCHEMATICS

(PS7)

provides

wave,

and

CIRCUITS

allows

VAC.

AC

by the front-panel

away from

line

minus

voltages

filtered

printed

voltages.

is

DS101.

circuit

the regulated

wave,

and

a series voltage-dropping

by lCl

Resistor

and

R9

transistor,

transistor

of lCl

+1

The

diode

8

CR7.

V

supply

DESCRIPTIONS

APPEARING

two regulated

amplified

operation

power

is

supplied

pOWER

the Sweep

ripple.

are

supplied

by

C1 and

board,

+18

an input

which

contains

provides

an

A2,

e1

improves

providing

by

protected

is

ARE

DC

voltages,

switch.

Drive

pulses.

at

line

a

a 3-prong

The

module

marker

by two

C7. A

12pin

provides

to

adjustment for

access

V

supplies,

the marker

resistor

boosts

the

amplification

its

own

the

current

against

for

IN

.18

V SERIES

The voltage

+18

V supply through

feedback,

transistor

Transistors Q3

tor.

and

are connected as a

the voltage across

circuit

CR8. Current limiting is transistor OG

CR9 and diode

SOUARE

protection

CR 1 2.

The 24 VAC

comparator lC3A.

REGULATOR

reference for

applied to

05

maintain

to

resistor

conducts

CR10.

WAVE

Reverse

GENERATOR

from

this supply is obtained

resistor

lC2, which

and

compound emitter

R20. Resistor R19

provides

regulated

a

provide

Q4

R13 is not loaded heavily.

voltage at

the

of transistor Q4 is

sufficiently

power

Diodes

provided

voltage

transformer

CR13 and CR14

by

to

protection

high

series

follower so that

provided

transistor forward bias diodes

is

T1 is squared

tection to the inverting input by limiting

range

to one

triangle

Darlington emmiter follower 07.

output

wave is routed

the RF output

other

circuits in the instrument.

TR IANG

The symmeterical square wave

by R26

symmetery

the inverting input

volt.

Capacitor

integrator

provides

P2,

and controls

MARKER

Negative-going module

the

base of

coupled through

volt. The square

generator

input

to one volt. A

to

during retrace and

WAVE

LE

GENERATOR

and

positive

10

of

is

also applied

15 V, negative 1

P2

where it is

output

wave

limits

CR15

provided

to control the

output of

and is AC coupled

zero. Diodes

about

by limiting

in

C13

configuration. This

the timing of other

AMPLIFIER

routed

are

the

the sweep

marker

PNP inverter O12. The collector signal

pulses

through

R41

to the base of

integrator lC3B to

to

CR16 and

the

feedback

signal,

ramp

and scope

circuits

from

7

of

voltage

network

applied

horizontal drive,

in

M7E

the

P2

and

NPN

to the

lC3A is adjusted

the instrument.

AC coupled to

from the

provides

gain,

forcing

the collec-

pass

element,

Short-

by diode

05

when

provided

provide

the

pro-

voltage

drives the

base of

negative

V

square

to blank

timing of

restore

protect

CR17

range to one

provides

to

8 of

(Option

inverter

013.

by

the

Automatic

sweep drive ramp

capture

to maximum if

when

below a specific

OSCILLATOR DRIVE

The drive voltage

the

by the

tors

it is equal to the sweep

summed to a standard voltage level

lC1A,

1

CR

resistor

each diode conducts, an additional

summing

the

output amplitude

INVERTED SWEEP

The

use

as a tuning

CAPTURE CIRCUIT

FET

WIDTH

manual mode

the center frequency

transistors

duction resistance,

width,

When

ficient

capture

a

This

rides

When

B)

removed, restoring

the

is

4.5

Frequency

to the

option

is used,

M11E module. lt

circuit that causes the sweep width

command is

a

varactor

voltages

and SWEEP

divide the

from

applied to

the lF input level

level.

to the

programming

FREOUENCY

R3, R4,

and

R41

width

and then

through CR5 conduct

string driven by constant

output of

transistors

control

to acceptable limits.)

the tuner

to

produces

the

instrument

SWEEP

fed

to the shaping circuii. Shaping

at

junction

lClA

reference.

are

generate program

a

front-panel

lF

response is restored, the capture

OSCILLATOR,

of the output amplifier,

is

Q4

ground

and in the automatic mode when an

control

connected

lF

markers,

at

full-band

the

normal

to

R31, the

set by

DRIVE RAMP

fed

is also

05, in

and

return,

pulse

parallel

in

which

sample input

limits

the automatic

10

that

sweep width

SWEEP WIDTH control setting.

transistors to

automatic

MODEL 1403

provides

an

also contains a

to increase

received from the

the tuner

diodes

WIDTH

frequency

program.

levels

to the

series with the

are

marker

turns

or receiver

is

determined

5 and

controls.

program

programs

The

in

the input amplifier,

determined

current source

current

Sweep

Ml1E via

normally

to

the

falls

program

full

frequency operation.

is fed into

Width

conducting

present.

is

reduce the con-

minimum sweep

below a

circuits

the transistors

conduction and

(MgJAI

inverted

Ml1E

falls

Resis-

so that

are

diodes

by a

01.

lC1 B. The

control.

for

8

SWEEP

(The

level

suf-

provide

off.

that over-

program

by

7

As

in

lF

is

Positive-going PULSE

MARKER

the PULSE MARKER

4.4

The

MARKER SWITCH,

SWEEP DRIVE

M2E-2 module

tor diodes in

pulses

SIZE control,

the Sweep

selected from

are

52, and coupled to

R44.

The

OUTPUT

IM?E-ZÌ.

provides

the

Oscillator module,

the

pulse

is then applied to

jack,

J5.

drive voltage to

and,

rear-panel

PULSE

the

the varac-

when the

RF

The

hetrodyning

sweeg oscillator with

quency

frequency

sweep signal

the output

oscillator in

{CW)

(1

to 300

for Model 1403 is

of

UHF

a

output of a 1

the

diode mixer.

a

MHz) is

amplified bV a

amplifier. A PIN diode voltage-variable

viding

leveler from

the monitor

vernier

amplifier, which is regulated by an

R F

diode.

level

adjustment,

is controlled by a

generated

voltage-controlled

GHz fixed

The

wide band

attenuator,

by

fre-

difference

pro-

ALC voltage

4-5

The

RF

output

O1.

operating

is

coupled

minals

of the

CR4.

CRs,

metery

of this mixer

{requency The

average frequency

controls

diodes

decreasing

oscillator

minals

The

the

CR1

9 of

the module

frequency

output

of the

resultant

preamplified

lowers

05

and 08.

R F

blanking

ret

race.

Two

RF

outputs

output is

consisting

flier

marker

is

coupled uia R27

provided

is

generatinE

coupled

of 09,

attenuator

provides

which

positive

the

The

leveler

of 01

3

and

supplying

uator.

leveler

ievel,

RF

go

to

variable

of OG

Monitor

negative

a

a positively

A

amplif ier

blanking

10

FET

to

negative

attenuator.

and 07

diode

DC

the inverting

creasingly positive

the RF

at

a

negative

current

output level

level

determined

amplifier's

varies

directly

tude

of

this negative

Max

control.

program

vides

voltage

a smail

zero.

is

4-6

of common

at

frequency

a

through

CR6, and

of

,

their

inductors

double-balanced

CR7.

bridge.

approximately

average

CR2,

bias on

and CR3. The

junction

to vary from

is

coupled

double-balanced

difference

by

transistor

Transistor

by shutting

provided

are

010,

and O1

J1

at

circuits.

through R26

consisting

current

amplifier,

015.

positive

is effected

during

input

non-inverting

with

which

negative

of PIN

variable

supplied

an

provides

current

increasing

produce

will

switch O12,

retrace.

(This

in

shutting

CR13, near

voltage.

supplied

the

voltage

is held

by

the level

voltage

sets

is maximum.

reference

base configured

of

approximately

L2

and L3

mixer,

R14

adjusts

Oscillator

to opposite ter-

consisting of diodes

the output sym-

02

1000 MHz

is

adjusted

by resistor R6

the cathodes

sweep

drive

is

applied

capacitance,

frequency

and

as the

and C14

RF

operational

to

low

to the

mixer

(0

amplifier

switches 06

preamplifier

this

from

C15 to

1. The

sweep sample

The

second RF

to

diodes

conduction

from

leveling

of

the varactor

thereby

to high.

other

through

to 300 MHz) is

04

and

preamplifier.

the

a wide band

output

the voltage-variable

CR1,

CR2, and

proportional

the leveler

amplifier consisting

the

to the voltage-variable

output

voltage from

an increasing

positive

by

a

which

thus

effect is

off

the

to the RF

leveler

at

this input

causes

shutting

reinforced

the

RF

Output

amplifier.

input

the leveler

off the

preamplifier

output

will

to the voltage-variable

constant,

the reference

input.

program

the maximum

by negative feedback.

voltage

This

reference voltage pin

at

is

determined

RF

The

Level Min

level

when

fixed

oscilLator

1000 MHz,

operates at a

to 1300 MHz.

which

of varactor

voltage

opposing

inductor

from

diodes,

causing

the

The sweep

ter-

L4.

then

emitter fol-

provide

07

off during

One

amplifier

this

of

ampli-

signal to the

output signal

CR3,

to

amplifier.

RF

output

R

voltage from

by the action

jack,

Since an in-

reduce

attenuator.

the leveler

at

7. The magni-

by the

level

when the

control

the

atten-

F

output

voltage-

stage.)

provides

level,

Level

proEram

by

the

to

the

pro-

Three

wide

band

amplifier

amplify the signal from

about 40

1 MHz

system

R8 sets

4.6

This module

attenuator,

Transistor Q1

with biasing

Q4

and

by the

and Q3.

during retrace,

during retrace.

to

a

CRl,

flou;ing

uator is

includes

O11.

and

RF output level.

input

amplifier

between voltage-variable

tains

allows adjustment

Q output

50

nected

4.7

The main function

amplifying

Marker

circuit

A low-level

Oscillator

then leveled

The voltage

ence voltage f,rom

sisting of

of

the

signals

The

operation

signal

The leveled

nal

marker

Output

point

tor

The

signal is

dB, with

and

above 300

establishes

the output impedance

SWEEP

zero

OSCILLATOR.

contains

a leveler

is

amplifier

a

common

of the varactor

Q5.

The

B- voltage

blanking

This modulation

signal from

thereby

The RF

voltage-variable

CR2, and

through

part

CR3. which is

leveler

the

of the closed-loop

monitor diode

provides

CR4

This negative

of

the leveler

provided

is

the

two inputs

attenuator.

a constant-amplitude

of the

impedance

between

MARKER

the monitor

ADDER

of

the individual

modules.

and the

transistors 013

leveling'amplifier.

is

arnplified

at the monitor

connector.

and

lt

also contains

sweep

sample

module,

in

the

from

is

same manner

the monitor

R52 is fed

and

of this

point.

sweep sample

mixer

diode,

J4.

establishes

then routed

sample leveling

stages,

016,

the voltage-variable

reduced

MHz.

signal is coupled from

attenuator

frequency

Since

the closed-loop

impedance

an

base varactor-tuned

diodes

for

causes

providing

at the monitor

at 75 12.

MODEL

oscillator.

and a monitor.

provided

the

oscillator

10 in

the oscillator

zero RF

a

consisting of

controlled

pass

transistor, O'10.

levelinE

CR4

negative

a

arnplifier.

by

is

amplified

leveler

and

DC

voltage

The

second

the LEVEL

and

This

closed-loop

signal

at the

signal

over a 20 dB range. The

provided

is

and the

(MsD)

this module

marker

signal,

connected

is

signals from

external

the

circuit.

supplied from

jack

to

as

the

diode,

to the leveling

and O14. 012

Any

error

between

fed

circuit

signal is

CR1.

R48,

to each MG

to PIN

produces

diode

connected

and

to the Sweep

connected

the

Q

50

Marker module.

a constant-amplitude

Oî7,

and

attenuator by

1503

response

(M9S-1)

below

leveling

point,

a voltage-variable

oscillator,

by transistors

is modulated

transistor

system

amplifier

is

connected

control.

usec!

monitor

by resistor

RF

adding

J2.

RF

CR6,

provides

attenuator CR5.

between

output impedance.

stages 02

to be cut off

output

the oscillator

diodes

bv the current

This

atten-

which

09,

relaîed

to the

to one

input

of the

Any error

to control the

system main-

point.

R8

Output

together

the

marker

This

output

and the refer-

amplifier con-

the two

to tne exter-

mixer

the Sweep

signal is

signal.

blanking

input

Sample

the moni-

01B,

level

also

O10,

and

con-

jack.

and

M6