HP 11971 Service manual

OPERATION

AND

SERVICE

MANUAL

I r

I

,

11971

1-i.AR~.IIONIC

SERIES

~-~IXERS

CERTIFICATION

Hewlett-Packard Company certifies that this product

met

its published specifications at the time shipment from the factory. Hewlett-Packard further certifies that its calibration measurements traceable to the United States National Bureau caiibration facility, and to the calibration facilities

of

Standards, to the extent allowed by the

of

other International Standards Organization

Bureau

members.

WARRANTY

This Hewlett-Packard instrument for a period pany

will,

For

warranty service Buyer shall prepay shipping charges Buyer. However, Buyer shall pay all shipping charges, duties, and taxes from

another

HP warrants its programming instructions when properly installed

operation

of

one year from

at

its option, either repair

or

repair, this

country.

that

its software and firmware designated

of

the

instrument,

date

or

software,

product

of or

product

to

is

warranted against defects in material and workmanship

shipment. During the warranty period, Hewlett-Packard Com-

replace

HP and

products

must

HP

or

firmware will be uninterrupted

which prove

be returned

shall pay shipping charges

by

on

that

to

a service facility designated

HP

for use with an instrument will execute

instrument. HP does

to

be defective.

for

products returned

or

to

return the product

not

warrant

error free.

by

to

that

LIMITATION OF WARRANTY

The foregoing

by

Buyer, Buyer-supplied software outside tenance.

of

wa.rra.11ty

the

environments~l

sh::~H

not

specifications for

apply

or

to

defects resulti'lg from improper

interfacing, unauthorized modification

the

product;

or

improper site preparation

or

inadequate maintenance

or

misuse, operation

or

main-

of

are

:S

HP.

to

HP

the

NO

OTHER WARRANTY IS EXPRESSED

PLIED WARRANTIES

OF

MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

OR

IMPLIED. HP SPECIFICALLY DISCLAIMS THE

EXCLUSIVE REMEDIES THE REMEDIES PROVIDED HEREIN ARE BUYER'S SOLE

SHALL NOT BE LIABLE

QUENTIAL DAMAGES,

FOR

ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSE-

WHETHER BASED

ON

CONTRACT, TORT, OR ANY OTHER LEGAL

AND

EXCLUSIVE REMEDIES.

THEORY.

ASSISTANCE

Product maintenance agreements and other customer assistance agreements Packard products.

For

any assistance, contact your nearest Hewlett-Packard

provided at the back

of

this manual.

Sales

and Service Office. Addresses

are

available

IM-

HP

for Hewlett-

are

_______

Ffj0W

HEWLETT

___

-=~PACKARD

______,

OPERATION

11971

HARMONIC

(K, A,

This manual applies directly with serial numbers prefixed 2332A, to ers with serial numbers prefixed 2525A, 11971U 2526A.

For numbers, see

Section!.

Q,

and

additional

AND

SERVICE

SERIES

MIXERS

U,

and V Models)

SERIAL NUMBERS

t::>

HP

V mixers with serial numbers prefixed

important

MIXERS COVERED

information

MANUAL

11971K

HP

BY

and A mixers

11971Q

and

about

MANUAL in

mix-

to

serial

HP

MANUAL Microfiche

1212 VALLEY HOUSE DRIVE, ROHNERT PARK, CALIFORNIA, 94928-4999, U.S.A.

PART NUMBER: 11971

Part

Number:

11971·90015

..

90014

1985, HEWLElT·PACKARD COMPANY

Printed:

August

1985

CONTENTS

GENERAL INFORMATION Introduction Mixers Covered

Serial Numbers

~1anual

Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Spectrum

Specifications . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Equipment

Waveguide Connector Screws . . . . . . . . . . . . 1-4

Test

Equipment

Environmental

II

OPERATION Introduction Operating Precautions

RF

Input LO Input Power Electrostatic Discharge HP 11975A ALC Switch Waveguide Protection Foam

Getting Started . . . . . . . . . . . . . . . . . . . . . . . 2-2

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

by

Manual . . . . . . . . . . . . . . . .

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

UpdatL90J.g

Analyzer

Supplied

Power

Supplement

High

.. ..

and

Accessories

limitations

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

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

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

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

. . . . . . .

Power

LO

Options

. . . . . . .

..

Available

. . . . . . . . . . . . . . . . 1-4

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

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

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

..

. . . . . . . . . .

......

. . . .

. . .

1-1 1-1 1-1 1-1

1-1

..

1-3

Measurements with the HP 11971 Mixers

Basic Frequency Measurement . . . . . . . . . . . . .

Identifying Signals with

Analyzer Signal Identifier . . . . . . . . . .

Signal

Image Frequency Method . . . . . . . . . . . . . . . 2-4

Amplitude

III

PERFORMANCE TESTS

Calibrated Measurements

the

HP 8569B

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

........

.........

......

2-3 2-3 2·3 2-3

2-6

3-1

14

Test Record

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

3-1

1-4

2-1 2-1 2-1 2-1 2-1 2-1 2-1 2-1

Conversion Loss and Frequency Response Average Noise Level Test

IV SPECTRUM ANALYZER CALIBRATION

Introduction

V SERVICE

Maintenance

Repairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Replaceable Parts Replacement

Circuit Description . . . . . . . . . . . . . . . . . . . . .

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

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

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

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

of

SMA

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

Connectors . . . . . . . . . . .

......

.....

3-7

3-15

4-1 4-1

5-1 5-1 5-1 5-1 5-1 S-1

ii

GENERAL

INFORMATION

INTRODUCTION

The

HP

Models

with

very

flat

frequency frequency GHz,

7 5

GHz. GHz. within

the

HP raise power accuracy below.)

A label particular to

read

reference

accurate

are

five screws

the

11971Q

The

Each

the

Model 8

the

LO

leveling

at

on

mixer.

version

level

to

range

overall local oscillator (LO)

model

overall range

56

power

capability

their

the

top

of offset

±2

dB,

(four

11

9 7 1

K,

of

18

to

covers 33

in

the

9B

Spectrum

to

optimum

of

each

An

8-1/2

the

same

at

can

be employed

required)

SECTION

GENERAL

11

9 7 1 A,

response

7 5 GHz.

to

series employs a

of

the

their

of

LO

mixer shows a Conversion Loss

by

graph

significant

11 characteristics

The

50 GHz,

series.

Analyzer.

required

the

HP

input

11-inch

shown

for

attaching

9 7 1

Q,

11

9 71 U

11971K

the

11971 U covers

frequency

different

The

LO

ranges

The

HP

LO

power

11975A.

level of + 16 dBm. (See also Signal Analyzer High Power

calibration

points across

for

absolute

on

the

The

the

mixer

I

INFORMATION

and

11 9 71 V are

and

low conversion

covers 18 to 26. 5 GHz,

40

to

60

GHz

range

LO

119

level

mixers

table

label, plus a list

the

amplitude

of

the

HP

harmonic,

of

these mixers

71

Mixers use

of

+ 14

shipped

mixer's

RF

input

and

as a result has a

the

to

+ 18 dBm. By

are

able

to

Calibration

with

which

frequency

measurements. Also supplied

flange

general-purpose

loss.

Collectively,

the

11971 A covers 26. 5

and

the

11971 Series Mixers is

make

them

HP Model

taking

achieve maximum

graph

the

to

plotted

mixer provides a larger, easier

shows

the

range.

waveguide.

harmonic

they

11971V

different

fully

11

conversion loss

The

covers 50

compatible

9 7

SA

Amplifier

advantage

measurement

LO

especially

calibration

with

each

mixers

cover

2.

0

to

LO

of

Options

for

the

to

40

to

4.

range

with

to

the

that

and

table,

mixer

5

MIXERS

Serial

Attached

serial

digits made contents on

Numbers

number

are to

the

title

Manual

A

mixer

on

the

title

in

this

manual.

COVERED

to

your

is

the

suffix.

the

mixer.

of

this page.

BY

MANUAL

mixer is a label

in

two

parts.

The

prefix is

The

suffix, however,

manual

apply

Updating Supplement

manufactured

page. This unlisted serial

The

after

manual

which

The

first

to

mixers

the

printing

shipped

shows

four

the

same

with

of

number

with

digits

is

assigned

the

this

prefix

this

both

and

for

all

serial

manual

newer

the

mixer

the

letter

identical

sequentially

number

may

have

indicates

mixer

is accompanied by a yellow

model

mixers;

the

number

are

the

serial

it

and

is

prefixes listed

a serial

mixer

is

and

its serial

number

changes only when a change is

different

number

different

for each mixer.

under

SERIAL NUMBERS

prefix

from

number.

prefix;

the

that

is

those described

Manual

The

last five

The

not

listed

Updating

1-1

GENERAL

INFORMATION

HP

11971K

HP

11971A

HP

119710

HP

11971U

HP

11971V

WAVEGUIDE

HP

PART

NUMBER

Figure

SCREWS

3030-0221

1-1.

HP

supplement. This supplement contains change newer

In manual. periodically request with

Complementary

Addresses

For Updating

mixer.,

addition

to

To

this manual's

of

information

supplement, contact your nearest

change information, the supplement

keep this

major

manual

the

print

copies

as

current

latest Manual Updating supplement. The supplement

date

and

of

the

supplement

offices worldwide

concerning a serial

and

part

are

listed

number

number, both

Hewlett-Packard

11971

Series

information

may

accurate

are

available

on

the

inside

prefix

that

WAVEGUIDE

HP

PART

Harmonic

which explains how

contain

as

possible,

information

Hewlett-Packard

Mixers

SCREWS

NUMBER

1390-0671

to

for correcting errors

for

of

which appear on the

from

your nearest

rear

cover of this manual.

is not listed on the title page

office.

adapt

the

manual

recommends

this

manual

is identified

title

Hewlett-Packard

or

in

the

to

the

in

the

that

you

page.

office.

Manual

OPTIONS

Option Part

009, shown

Number

in

Figure

5061-5458), waveguide connector screws, on

the

SMA connectors.

1-2

1-2,

one

and

is

a Mixer

hex-head

one .

312-inch

Connection

ball-driver

open-end

Kit.

(HP

Part

wrench (HP

It

includes three low-loss SMA cables (HP

Number

8710-1539)

Part

Number

for

tightening

8710-051

0)

for

the

use

GENERAL

INFORMATION

/

LOW-LOSS

HP

PART

5/16-INCH

HP

PART

SMA

CABLE

NUMBER

OPEN-END

NUMBER

(1

5061-5458

WRENCH

8710-0510

OF

3)

SPECTRUM

Option output.

input power requiren1ent

used

for

ANALYZER

003

for

the

HP Model 8569B

With

this optional amplifier,

this

purpose can be eliminated

OOIIIt&'f

Figure

HIGH

of

the mixers, and the HP Model 11975.A

1-2.

POWER

Spectrum

the

from

Mixer

Connection Kit;

LO OPTIONS

Analyzer adds

analyzer's LO

the

test setup.

_,~

output

......

Option

an

power level is increased

009

internal

..

l*·.,mplifier

amplifier

(or

its equivalent) normally

to

the

analyzer's LO

to

meet

the

LO

1-3

GENERAL

Option analyzer external

For

further

85698-2.

INFORMATION

013

for

the

with

an

amplifier

information

Option

SPECIFICATIONS

HP

85698

internal

to

increase

013

is

described in

adds

an

internal

comb generator.

the

analyzer's LO

about HP

85698

HP

Service

amplifier

As

with

Option 003, Option 013 eliminates the need for

output

Option 003

Note

85698-3.

to

the

power

and

analyzer's LO

to

the level required by

output

its installation,

refer

and

also provides

the

mixer.

to

HP Service Note

the

an

Specifications

standards against nominal operating values characteristics

EQUIPMENT

for

the

HP

Model 11971 Series Mixers are listed

which

are

included only as additional information; they

the

mixers

are

listed

SUPPLIED

Waveguide Connector Screws

Five

hex-head each mixer. ball-driver the

waveguide screws.

TEST

EQUIPMENT

screws (includes one spare), HP

Use

ONLY the screws supplied

hex screwdriver available

AND

ACCESSORIES

in

Equipment and accessories recommended

III.

The

HP 11969A

5061-

5459). See Figure 1-3. This case will hold as many as five

is

a wooden,

internally

Kit.

in

Table

tested (performance tests

in

Table

1-2,

Supplemental Characteristics. Supplemental

are

Part

Number

with

it

to

the

Option 009 Mixer Connection Kit simplifies installation

3030-0221

attach

the mixer to

1-1.

These are

the

provided in Section III). Typical

not specifications.

or1390-

0671,

are

the

waveguide. The special

AVAILABLE

for

testing

padded,

the

Model 11971 Series Mixers

transportation

and

storage case (HP Part

different

are

listed in Section

mixers and a Mixer Connection

performance

supplied

with

Number

or

of

ENVIRONMENTAL

LIMITATIONS

The HP 11971 Series Mixers meet

Class

3,

Style

C.

Their specific environmental qualifications are as follows:

Temperature, Non-operating:

Temperature, Operating: 0

Relative Humidity: 95

°C

±5%

Altitude, Non -operating: Less

Altitude, Operating: Less than

Maximum Vibration Levels: 2 G's

Maximum

Shock.:

30

G's

1-4

or

exceed

-40

to

up to

than

3,048

the

environmental

°C

to

+ 7 5

°C

+55 ° C

30°C

12,19 5 meters ( 40,000

meters (

at

5 Hz

10,000

to

2000

Hz

requirements

ft.)

of

MIL-T-28800C,

Type III,

GENERAL

J

INFORMATION

Figure

1-3.

HP

ll969A

Transportation

and

Storage

Case

l-5

GENERAL

lNFORMA

TION

Table

Unless otherwise stated, all input

amplitudes

LO

Ampiiiude

+14to

Calibration Accuracy:

11971K/

± 2.0 dB with

14.5 to

Range:

+18dBm

A/Q/U:

16

dBm

LO

of

1

amplitude range

11971V:

± 2.2 dB with LO amplitude range

14.5 to

16

dBm

11971K/A/Q/U:

± 3.0 dB with LO amplitude range

16to

18dBm

11971V:

± 3.2 dB with

16to

18dBm

LO

amplitude range

1-1.

less

HP

11971

specifications

than

-20

of

Series

Mixer

NOTE

dBm.

GENERAL

Specifications

apply

for

an

IF

Bias Requirements:

of

(1

321.4

of

MHz

2)

None

Maximum

+20dBm

Maximum Peak Pulse Power:

+

(avg. power: +

Environmental:

Meets StyleC

IF/LO Connectors:

SMA

CW

RF

Input

(100 mW)

24

dBm with

MIL-T-28800C, Type

female (replaceable)

<I

20 dBm)

,.,s

Level:

pulse

and

III,

for

RF

Class 3,

MODEL 11971K

RF Frequency Range:

18-26.5GHz

LO Harmonic Number: 6 LO

Input

Frequency Range:

2.95-

4.36 GHz

Maximum HP 8569B Noise Level

+ 14.5

Conversion Loss:

to

+ 16

dBm

at 1 kHz

LO

Input

Power:

-llOdBm

Frequency Response at + 14.5 LO

Input

Power:

±2.1

dB

Frequency Response at + 14 LO

Input

Power:

to

±3.0dB

'The

HP

mixers. Leveled power capability

11975A Amplifier, or a similar amplifier, must be used to provide sufficient LO power (14 to

a.tnplitude accuracy with the mixers.

of+

24

dB

Bandwidth, and

to

+ 16

dBm

+ 18

dBm

16 dBm, as

is

available with the

MODEL 11971A

RF Frequency Range:

26.5-40GHz

LO Harmonic Number: LO

Input

Frequency Range:

2.62-3.97

Maximum Conversion Loss: HP 8569B Noise Level

+ 14.5

to + 16

GHz

dBm

10

at

1 kHz Bandwidth, and

LO

Input

-106dBm

Frequency Response LO

Input

Power:

±2.1

dB

Frequency Response at + 14 LO Input Power:

at

+ 14.5

±3.0dB

HP

11975A,

is

necessary to achieve the maximum

28

dB

Power:

to

+ 16

to

+ 18

dBm

18

dBm) to the

1-6

GENERAL INFORMATION

RF

Frequency Range:

Table

MODEL 11971Q

1-1.

33-50GHz

LO Harmonic Number: LO

Input

Frequency Range:

2.04-3.10GHz

Maximum Conversion Loss:

H P 8569B Noise

+ 14.5

to

+ 16

-92dBm

Frequency Response at + 14.5 LO

Input

Power:

Level

dBm

16

at

1 kHz Bandwidth, and

LO

Input Power:

±2.3dB

Frequency Response LO Input Power:

at

+ 14

±3.2dB

to

40

to

HP

dB

+ 16

+ 18

11971

dBm

Series Mixer Specifications (2 of 2)

MODEL 11971U

RF

Frequency Range:

40-60GHz

LO

Harmonic Number:

LO

Input

Frequency Range:

2.48-3.73 Maximum Conversion Loss: HP 8569B Noise Level

+ 14.5

-92

Frequency Response at + 14.5 LOinputPower:

to

dBm

+ 16

GHz

dBm

16

at

1 kHz Bandwidth, and

LO Input Power:

±2.3dB

Frequency Response at + 14 LO Input Power:

±3.2dB

to

40

to

dB

+ 16

+ 18

dBm

MODEL 11971V

RF Frequency Range:

50-750Hz

LO Harmonic Number:

LO

Input

3.10-4.42 GHz Maximum Conversion Loss: HP 8569B Noise Level at

+ i

4.5

to

-89dBm

Frequency Response at + 14.5 LO

Input

1

16

Frequency Range:

1kHz

+ i 6

dBm

LO

input

Power:

±2.5dB

Frequency Response at +

LO Input Power:

14

±3.2dB

42

dB

Bandwidth, and

to

+ 16

dBm

to

+ 18 dBm

'The

maximum frequency is

71

GHz

when used with the

HP

8569B Spectrum Analyzer.

1-7

GENERAL INFORMATION

Table

1-2.

HP

11971

Supplemental

NOTE

Characteristics

Supplemental not

specific-ations.

3

dB

IF

Bandwidth:

Spectrum Analyzer

characteristics are included

DC

to

Absolute

Accuracy (using calibration

+ 14.5

to

+ 16

dBm

LO):

11971K, 11971A, 11971Q, 11971U,

1i9i1V,

RF

Input

11971K: ll971K: <2.2:1 ii97iQ/U: ll971V: <2.6:1

18-26.5

26.5-40 33-50GHz: 40-60

50-75

GHz: ±3.4dB!

SWR:

<2.9:1 First

<2.2:1 Fuii band

GHz:

200/o

Last

800/o

Full band

PHYSICAL CHARACTERISTICS

1.3

GHz

Amplitude

data

with

±3.3dB ±3.3dB ±3.3dB ±3.3dB

of

band

of

band

a

only

as additional information; they are

Odd Order

Mixing

Product

Suppression:

11971K/ A: >20

dB

11971Q/U/V: >15 dB

Gain Compression Level

11971K: 11971A: 11971Q: H9iiU: 11971V:

-3

-7

-3

dBm

dBm dBm dBm

dBm

(<1

dB):

5061·5458 Cable Insertion Loss:

.8dBat2GHz

l.i

dB at 6

GHz

Model

110711(

.

·~·

11971A

111:17-tn

I 1.::1'1

11971U

11971V

1

The maximum frequency

2

Waveguide attachment screws enter blind holes in the flanges

....

IU.

UG-383/U-M

J

-

UG-599/U

Tlr!

vu-.;Jo~/v

UG-385/U

2

Flange

u;

'1:0'1:

IJ

.......

=~_,..,,-

WR-42

WR-28

~O"'nT

WR-22

WR-19 0.32lb 1.4 in

WR-12

Weight

T

f)

17

Jr

'""'•

...

f '""et

0.36lb

0.14

kg

0.321b

1\

1 A

L.-

u •

.&.,I\.Q

0.321b 1.4 in

0.14

kg

0.14

0.32lb

is

71

GHz

when used with

X

..

...,...,

..........

1.4 in

36rnm

1.4in

"1&.--

.;JU

.lUlU

36rnm

36mm

1.4in

HP

8569B Spectrum Analyzer.

y

,.,

...

••u••

2.0in

51

mrn

2.0in

l:f--

..JJ. 1&1111

2.0in

Slmm

2.0in

51

mrn 76mrn

2.0in

of

the mixers.

z

oo .......

..,..,

......

3.5 in

7lmm

2.8in

"''L--

1\1111111

3.0in

76mm

3.0in

1-8

OPERATION

INTRODUCTION

Tl1is section provides information on

OPERATING

Do

not

exceed

RF

Input

CW: No Pulse:

No

Average: No

PRECAUTIONS

the

Power

greater

than + 20

than

greater

maximum

dBm

+24

dBm

than

+20 dBm

ratings listed below or

at~

how

l

USee

SECTION

OPERATION

to make

effective

permanent

II

use

of

the

HP

119711Yfixers.

damage to the mixer will result.

LO

Input

Power

No

greater

EJectrostatic

than

+20 dBm

Discharge

When installing the mixer, always connect BEFORE damaging

HP

!197SA

BEFORE using

to

the

This level of

Waveguide

Do

not

waveguide. Since the mixer

connecting the

mixer diodes.

ALC

Switch

the

HP

ON

position.

When

LO power

Protection

remove, displace,

them

to

1197

SA

this switch is

can

destroy

Foam

or

damage

is

the

mixer. This will minimize the danger

Amplifier to increase the LO input power, set the amplifier ALC switch

in

the

mixer diodes.

the

white,

amplitude calibrated

calibration.

the

SMA cables to the spectrum analyzer and LO amplifier

of

an

electrostatic discharge

the

OFF

position

The

non-conductive

with

the

LO power

ALC switch

is

on

foam installed

this foam in place,

can

be

greater

the

amplifier rear panel.

in

the

open end

tampering

with

than

it

+20 dBm.

of

affects

the the

2-1

OPERATION

GETTING

The HP Model 11971 series

HP 11971 Mixers require an the

HP 11971 Mixer does not have sufficient LO power,

to

increase the LO power.

STARTED

See Section I Model

8569B

for

information

Spectrum

of

millimeter wave mixers have no bias or back-short adjustments.

LO power

Analyzers.

of

relating

+ 14 to +

CAUTION

Before connecting

switch

to

ON.

the

Failure

to

HP

do

11975A

this

NOTE

18

wiJI

damage

to

High Power

dBm at the

use

the

Amplifier,

the

LO

input.

HP 1197

set

its

mixer.

options

SA

rear

for

If

the

analyzer you

Amplifier

panel

HP

or

ALC

use

an

equivalent

with

With

the three SMA cables (HP Part

Number

S061-S4S8) provided in the Option 009 Mixer Connection Kit, connect the HP 11971 Mixer, the spectrum analyzer, and Figure

Leave flange mating surface from appropriate waveguide Input

2-1.

the

waveguide cap on whenever

dust and scratches, which can degrade the mixer's performance. Use

attenuator

if

the

Power shown in the specifications.

SPECTRUM

ANALYZER

SMA

the

output

mixer

CABLE

is

not connected to a device under test. This protects the

power

of

the unit under test exceeds the Maximum RF

SMA

CABLES

the

HP 1197

SA

Amplifier as shown in

an

2-2

Figure

2-1.

HP

11971

Mixer

Connections

OPERATION

MEASUREMENTS

The

control

the

HP

frequency

through between

BASIC

Set

the

1.

Push

DIV].

FILTER arrows

2.

Pres8

3.

Press

4.

Set

settings used in this section are for

8569B

a

2.

of

1.

5

the

5

GHz

and

IF

HP

4.

FREQUENCY

controls on

in

all

green

(See

Normal

to

OFF

on

the

FREQUENCY

MIXINGMODE

the

FREQUENCY BAND

the

FREQUENCY SPAN MODE to

WITH

input

THE

HP

requires a

11971

321.4

MIXERS

the

HP 8569B Spectrum Analyzer for

MHz signal,

and

this is compatible

11971 Mixers. This output, specifically designed for a

low-pass filter. Second,

5 GHz, which fulfills

the

frequency range

LO

input

of

frequency requirements

MEASUREMENT

the

HP 8569B as follows:

pushbuttons except MIXING MODE [!NT]

Settings

(green position), SWEEP

in

the

HP

SPAN/DIY

8569B Spectrum

TIME/DIY

and

RESOLUTION

to

and

FREQUENCY SPAN MODE

Analyzer

AUTO (green position), and line

BW

controls.

[EXT].

GHz

pushbutton

[FULL

corresponding

BAND].

to

the

two

reasons: First,

with

the

IF

calibration

321.4

MHz IF, is coupled

the

HP 8569B 1st LO

of

the

HP 11971.

output

[PER

Operation manual.) Set VIDEO

up

the

green

mixer's frequency band.

is

5.

Set

the

FREQUENCY SPAN/DIY control

6.

Set

the

INPUT A

7.

Set

REFERENCE

8.

Set

EXT

MIXING BIAS

HP 11971 Mixers.

When using correct HP

8569B

If

the

frequency

shown

and

mode

an

reference

in

Spectrum

on

the rotate

IDENTIFYING

Signal

Analyzer

TTEN

(dB)

control to

LEVEL to

in

detent

external

mixer, set

level. Except for this

the

external

mixing mode is identical

to l 00

0.

-10

dBm

and

positon (center). This

the

spectrum analyzer

internal

MHz.

FINE

to 0

attenuator

with

Analyzer Operation Manual.

of

the

signal

is

known,

rotate

the

FREQUENCY

digital display. For a more detailed analysis

the

FREQUENCY SPAN knob

SIGNALS WITH

THE

HP

to

8569B

obtain

Signal Identifier

dB.

turns

off

the

internal

control

the

attenuator

of

standard

TUNING

of

the

signal, set

the

desired resolution.

mixing bias. It

to 0 dB

the

reference level, operation

is

not

to

operation described

control until the frequency

the

HP 8569B to

required

maintain

of

in

the

PER DIY

for

the

HP

is

The

built-in

this

verification, set the

SIG IDENT. display.

(See

signal

If

Figure

identifier

the

response

2-2.)

can be used to

SPA~.J/DIV

is

control

correct, a second signal, shifted one division to

verify

to

that

2

~,1Hz/DIV.

the

displayed response

Center

the

is

the

desired signal. For

iesponse on the display,

the

left, appears on the

then

press

2-3

OPERATION

Signals

Identification routine. If you are in doubt about the identification,

signal

Image Frequency Method

with

residual FM,

identification

described below.

CTR

24.

015

REF

-20

!&

I I I I H

..

or

FM pulse modulation, might not be successfully identified

GHz

SPAN

2

10

<II/

MHzl

ATTEN 0 dB

! !

.JJI

RES

BV

100

SVP

I~

I

I I I I

\ir.J.,

..II.

Figure

2-2.

Signal

kHz

AUTO

•

YFOFF

.A.

Identifier

with

use

the .,image frequency method

2MHz

the

Signal

..

of

The

"image frequency method"

an

image

that

is displayed

Knowledge Figure

Mixer. A reduced version

Figures

11971K

frequency range determined of

the desired responses, there division The

desired 6+ harmonic response

The

shaded areas on the

r-

...

1ixer where the responses are imprecise, a result

range

1.

To begin Measurement paragraph.

2.

Using image

of

the

harmonic mixing process makes

2-3

shows a typical display on

2-4

and

2-5)

is

included

Mixers

RF

that

mi'{ing

are

factory-calibrated

of

2.

95

to

the

signals displayed

with

LO frequencies

is

of

the

CRT

can be seen to

of

the

mixer. Any signal falling inside a shaded

the

identification procedure, set

the

chart

in Figures

pair

can appear.

chart

of

signal

643

MHz (twice

of

the

HP

in

4.

36 GHz.

no need to investigate

be

is

in

Figures

2-4

identification

the

HP 8569B

8569B Spectrum Analyzer

Figure

the

2-3

for

the

By

reference to the tuning curves

in

approximately

of

less

the

result

large response

2-4

or

2-5,

determine

depends on

321. 4 MHz IF) above

the

"image frequency method" easier

with a 24

to

aid

in

identifying

6+ mixing mode, which gives them a corresponding LO

the

first

than

3 GHz. Because these signals

them

further.

of

the

RF

input

pair

near

and

2-5

represent

of

the

P"F

area

can

the

HP 8569B controls as described

the

limits on

the

fact

it

on

the

GHz

signal applied

harmonic

four

The large response mixing the

the

mixing with

be ignored.

mixing

the

signals present on

in

divisions

with

8th

division

regions for each

LO

the

display

that

the

correct response has

spectrum analyzer CRT.

and

faster to use.

to

the

HP 11971K

tuning

Figures

of

the

the 8th

of

frequencies outside the

within

curves (shown

the

2-4

and

2-5,

display

are

pair harmonic

the CRT.

are

obviously not

near

HP

in

Basic Frequency

which

display. HP

the of

11971 Series

the

it

can be

the

result

fourth

the LO.

desired

in

the

LO

3. Rotate

responses.

2-4

the

HP 8569B

TUNING

control to place

the

marker

between a pair

of

possibly correct