POTOMAC INSTRUMENTS INC. FIM-21 Manuel utilisateur

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POTOMAC

INSTRUMENTS

INC.

INSTRUCTION

MANUAL

FIELD

STRENGTH

METER

FIM-21

POTOMAC

INSTRUMENTS,

inc.

932

PHILADELPHIA

AVENUE

SILVER

SPRING,

MARYLAND

20910

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•V

100

PHON[S

FIELD

STRENGTH

METER

FIM-21

POTOMAC

INSTRUMENTS

inc.

PRECISION

ELECTRONIC

PRODUCTS

932

PHILADELPHIA

AVENUE

SILVER

SPRING.

MARYLAND

20910

(301) 589-2662

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WARRANTY

FOR

EQUIPMENT

AND

ACCESSORIES

Potomac

Instruments

inc,

warrants

each

new

equipment

free

defects

material

and worlananship,

for

period

one

)

year

after

date

original

ship

ent,

except

for

tubes,

lamps,

fuses,

transistors,

and

diodes

which

will

wa:rranted

for

period

ninety

(90)

days.

Any

instrument

which

fom1d

with-

one

year

not

meet

the

foregoing

standards

after

examination

our

factory,

will

repaired

the

option

Potomac

Instruments

replaced

without

charge.

This

warranty

does

not

apply

equipment which

has

been

altered,

improperly

handled,

damaged

any

way.

CHANGES

TIJ

SPECJJi'ICATIONS

The

right

reserved

change

the

published

specifications

equipment

any

time,

and

furnish

merchandise

accordance

with

current

specifications,

without

incurring

any

liability

modify equipment

previously

sold.

RETURNING

EQUIPMENT

THE

FACTO

Factory

service

available

for

repair

and

adjustment

this

instrument;

however, a

description

the

trouble,

plus

the

model and

serial

number(s)

the

Wlit

should

forwarded

first,

whereupon

instructions

for

correcting

the

trouble

authoriza

for

returning

the

equip

ent

will

given.

This

applies

all

Wlits,

whether

under

warranty

not

. Shipment

improper

containe

may

resul

damaged equipment

thereby

voiding

warranty

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TABLE

CONTENTS

Paragraph

Page

1.2

1.3

2.1

2.2

2.3

2.4

2.5

2.6

3.1

3.2

3,3

4.1

4.2

4,3

4,4

4,6

4.7

4,8

4,9

4.10

SECTION

GENERAL

DESCRIPTION

Scope

Manual

••••••

Purpose

Equipment

•••

:Equipment Spec

ifications

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

SECT

ION

OPERATION

1-1

General

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

2-1

Operating

Controls

and

Indicators.

• • • • • . • • •

2-1

FIM

Calibration

. • . . • • • • • • • • • • • •

2-2

easuring

Field

Strength

• • • . • • . • • • • • • • 2-4

Measur

ing

Harm

onic

Ratio

Dec

ibels

• • • • • • • • 2-5

R. F. Bridge Measurem

ents.

(Tuned

Voltmeter)

• • • • 2-6

SECTION

3•

THEORY

OPERATION

General

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

Block Diagram

Descript

ion.

Circuit

Description

•••••••••

SECTION

MAJNTENANCE

General

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

Batt

ery

Replacement . . . . .

Battery

Types . . . . . . .. .

LaJJIP

eplac

ement .

Rem

ove

FIM

fro

m Case .

. . . .

Operate

the

FIM

With Case

Rem

oved

place

ment . . .

Preventive

Maintenance .. .

Troubleshooting

and

pair

. . . . .

Recalibration

. . . . . . . . .

SECTION

SCHEMATIC

DIAGRAM

General

...••

iii

... ..

. . . .

...

. . .

. . . . .

. . .

....

. .

•

3-1

3-3

4-1

-1

4-1

4-2

4-3

4-5

4-S

5.1

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LIST

ILLUSTRATIONS

Figure

2-1

Operating

Controls

and

Indicators.

• • • • • • .

2-3

3-1

Field

Strength

Meter,

Functional

Block Diagram

3-2

4-1

4-2

4-3

5-1

Table

1-1

1-2

2-1

Troubleshooting

Voltage

Charts

••.•••

Field

Strength

Meter, Component

Locations.

Field

Strength

Meter,

Component

Locations.

Field

Strength

Meter, Schematic Diagram

••

LIST

TABLES

. . .

Specifications:

Type

FIM-21

Field

Strength

Meter

Type

FIM

-41

Field

Strength

Meter

Operating

Controls

and

Indicators

..••••

• •

4-1+

4-6

4-7

5-1

1-1

1-.3

2-1

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SECTION

l .

GENER.AL

DESCRIPTION

1.1

Scope

Manual

This

manual

provides

a comprehe

ive

technical

description

the

operating

and

physical

characteristics

the

FIM

-2

and

FIM-41

Field

Strength

eters.

provides

sufficient

information

conc

ning

the

operation

and

func

ional

theory

operation

permit

effective

operation

these

instruments.

1.2

Purpose

Equipment

Field

Strength

Meters,

FIM

and

FIM-41

are

light

weight

portable

ins

truments

for

the

asurements

wide

range

radio

signal

intensities

the

.54

5.0

MHz

uency

spectrwn.

The

FIM

covers

the

broadcast

band

(540

1600

KHz)

while

the

FIM-41

covers

the

broadcast

band and harmonic

fre-

quencies

MHz.

Both

units

are

rugged

test

instrumen

that

are

equally

effective

for

interference

studies

low

signal

strength

and

for

close-in

meas-

ements on

high-power

directional

arrays.

addition

, a

special

input

jack

permits

the

receiver

used

null

detector

for

Bridge

measurements.

l.J

Equipment

Specifications

(See

specifications,

FIM-21,

Table

1-1,

FIM-41,

Table

1-2)

Table

l-l.

pec

ifications:

Type FIM-21

Field

Strength

ter

Frequency Range:

eld

Intensity

Range:

Accuracy

Calibration:

Accuracy

Range

Attenuator:

ectivity

andwidth

db):

ejection:

Image

Rejection:

Adjacent

Channel

jection:

Panel

Meter:

Antenna:

535

KHz

1605

KHz

microvolts

per

meter

volts

per

meter

percent,

referenced

NBS

Standard

Field

percent

over

entire

range

and

tuning

band

KHz

nominal

with

ulti-pole

hybrid

ter

db minimum

db minimum 10

KHz

above

and

below

tuned

station

mirrored

scale,

logarithmic

graduations

10,

taut

band

meter

movement,

linearity

Shielded

loop,

integral

part

hinged

cover

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SECTION

l .

GENERAL

DESCRIPTION

(Cont.)

Table

-1.

ications:

Typ

FIM

-21

Field

Strength

Meter (Cont. )

Audio

Outputs

Recorder

Output:

Lights:

Batteries

uir

d):

Battery

Life:

Environmental:

Dimensions:

Weight:

External

ut:

Input

Switch:

METER

Switch:

Logarithmic

Dynamic Range:

1- 2

Front

panel

loudspeaker,

weather

treated

cone

Headphone j

ack,

high

and

low

(disconnects

speaker)

0.4

4 v

olts

proportional

field

ntensity

for

each

attenuator

range,

2000

ohm

source

resistance

Frequency

dial

and m

panel

switch

for

night

use

Standard

l½

volt

C-~ unrr

cells

l½

volt

.Alkaline

cells

for

extended

life

very

low

temperat

Greater

than

1000

readings

(re

duced

life

with

frequent

use

ights

and/or

high

speaker

volume)

Continuous e:xposure -

10°

+130°

lower

temperature

ope

ration

practical

for

reading

time

expos

8-3/4

high,

11-1/2

wide,

1/8

deep

with

cover

closed;

3-7/8

deep

with

cover

open

(gr

pping

width)

Approximately

ll-1/2

pounds

535

KHz

1605

KHz,

microvolts

vol

Selects

loop

antenna

(

ANT)

Panel

Connector

(EXT)

Selects

normal

linear

(

LJN)

oga-

rithmic

(LOG)

operation

60 db compressed

input

range

for

meter

and

recorder

output

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SECTION

GENERAL

DESCRIPTION

(Cont.)

Table

l -

Specifications:

Type FlN-41

Field

Str

ength

Meter

Frequency Range:

Field

Strength

Rang

Accuracy

Calibration

Accuracy

Range

Attenuator

Selectivity

Bandwidth (6

db);

Rejection

Image

Rejection:

Adjacent Channel

Rejection:

Harmonic Measurement:

Panel

eter:

Antenna:

Audio

Outputs:

Recorder

Output:

Lights

Batteries

1-3

.54

MHz

5.0

MHz

two bands

Band

•

535 -

1.61

MHz

Band

1.58

5.0

MHz

microvolts

meter

volts

per

meter

percent,

referenced

NBS

Standard

Field

percent

over

entire

range

and

uning

band

KHz

nominal

with

multi-pole

hybrid

filter

75 db

mini.nn.un

(min.)

540

KHz

decreasing

50 db

(min.)

4.8

MHz

minimum

KHz

above and below

tuned

station

Capable

measuring

harmonics

excess

80 db below fundamental

mirrored

scale,

logarithmic

grad-

uations

and

linear

scale;

taut

band meter movement,

linearity

Shielded

loop,

integral

part

hinged

cover

Front

panel

loud

speaker,

weather

treated

cone -headphone

jack,

high

and

low

(disconnects

speaker

)

0.4

volts

proportional

field

rength

for

each

attenuator

range,

2000

ohm

source

resistance

Frequency

dial

and m

eter

with

panel

switch

for

night

use

Standard

1-1/2

volt

C-

cells

l-1/2

volt.

Alkal...ine

cells

for

extended

life

very

low

tempera-

tures

(

six

req..uired)

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SECTION

GENER.AL

DESCRIPTION

(Cont.)

Table

1-2.

Specifications:

Type

FIM-41-

Field

Strength

Meter (Con

t.)

Battery

Ll.fe:

Environmental:

Dimensio

ns:

Weight:

External

Input:

Input

Switch:

METER

Switch:

Logarithmic Dynamic Range:

Accessories

Available:

1-4

Greater

than

1000

readings

(reduced

life

with

frequent

use

lights

and/or

hig

speaker

volume)

Continuous e:xposure

-1

0°

+130°

lower

temperature

operation

practical

for

reading

time

e:xposures

8-3/4

high,

11-1/2

wide,

5-1/8

deep

with

cover

closed;

3-7/8

deep

with

cover

open

(gripping

width)

Approximately

pounds

540

KHz

5.0

MHz,

microvolts

volts

Selects

loop

antenna

(ANT)

Panel

Connector

(EXT)

Selects

normal

linear

(LThT)

loga~

rithmic

(LOG)

operation

60 db compressed

input

range

for

met

and

recorder

output

Carrying/Shipping

dase

Unipod

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