POTOMAC INSTRUMENTS INC. FIM-41 Manuale utente

POTOMAC

INSTRUMENTS

INC.

INSTRUCTION

MANUAL

FIELD

STRENGTH

METER

FIM-41

7309 GROVE ROAD UNIT D

FREDERICK, MD 21704

PHONE -301-696-5550

FAX -301-696-5553

FIELD

STRENGTH

METER

POTOMAC

INSTRUMENTS

inc.

PRECISION

ELECTRONIC

PRODUCTS

WARRANTY

FOR

EQUIPMENT

AND

ACCESSORIES

Potomac

Instruments

inc.

warrants

each

new equipment

free

defects

material

and workmanship,

for

period

one

(l)

year

after

date

original

shipment,

except

for

tubes,

lamps,

fuses,

transistors,

and

diodes

which

will

warranted

for

period

ninety

(90)

days.

Any

instrument

which

found

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

IN SPECIFICATIONS

The

right

reserved,to

change

the

published

specifications

equipment

any

time,

and

furnish

merchandise

accordance

with

current

specifications,

without

incurring

any

liability

modi~

equipment

previously

sold.

RETURNING

EQUIPMENT

THE

FACTORY

Factory

service

available

for

repair

and

adjustment

this

instrument;

however, a

description

the

trouble,

plus

the

model and

serial

number(s)

the

unit

should

forwarded

first,

whereupon

instructions

for

correcting

the

trouble

authorization

for

returning

the

equipment

will

given.

This

applies

all

units,

whether

under

warranty

not.

Shipment

improper

container

may

result

damaged equipment

thereby

voiding

warranty.

TABLE

CONTENTS

Paragraph

Page

1.1

1.2

1.3

2.1

2.2

2.3

2.4

2.5

2.6

SECTION

GENERAL

DESCRIPTION

Scope

Manual • • . • • •

Purpose

Equipment

Specifications

SECTION

OPERATION

General . . . . . . . . . . . . . .

Operating

Controls

and

Indicators

FIM

Calibration

• • • • • • • • • •

. ..

Measuring

Field

Strength

• • • . • • • •

Measuring Harmonic

Ratio

Decibels

.•.••

Bridge

Measurements. (Tuned

Voltmeter)

iii

1-1

2-1

2-2

2-4

2-5

2-6

Figure

2-1

Table

1-1

1-2

2-1

LIST

ILLUSTRATIONS

Operating

Controls

and

Indicators

• • • • • • • •

Specifications:

LIST

TABLES

Type FIM-21

Field

Strength

Meter

Type FIM-41

Field

Strength

Meter

Operating

Controls

and

Indicators

• . • • • • • •

2-3

1-1

1-3

2-1

SECTION

GENERAL

DESCRIPTION

1.1

Scope

Manual

This

manual

provides

a comprehensive

technical

description

the

operating

and

physical

characteristics

the

FD1-2l and FD1-41

Field

Strength

Meters.

provides

sufficient

information

concerning

the

operation

and

func-

tional

theory

operation

permit

effective

operation

these

instruments.

Purpose

Equipment

Field

Strength

Meters,

FD1-2l and FD1-41

are

light-weight

portable

instruments

for

the

measurements

a wide

range

radio

signal

intensities

the

.54

5.0

MHz

frequency

spectrum.

The FD1-21

covers

the

broadcast

band

(540

1600 KHz)

while

the

FD1-41

covers

the

broadcast

band and harmonic

fre-

quencies

5.0

MHz. Both

units

are

rugged

test

instruments

that

are

equally

effective

for

interference

studies

low

signal

strength

and

for

close-in

meas-

urements

high-power

directional

arrays.

addition,

special

input

jack

permits

the

receiver

used

null

detector

for

Bridge

measurements.

1.3

Equipment

Specifications

(See

specifications,

FD1-21,

Table

1-1,

FD1-41,

Table

1-2)

Table

1-1.

Specifications:

Type FD1-21

Field

Strength

Meter

Frequency Range:

Field

Intensity

Range:

Accuracy

Calibration:

Accuracy

Range

Attenuator:

Selectivity

Bandwidth (6

db):

Rejection:

Image

Rejection:

Adjacent

Channel

Rejection:

Panel

Meter:

Antenna:

1-1

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

multi-pole

hybrid

filter

minimum

80 db

minimum

50 db

minimum

KHz

above and

below

tuned

station

411

mirrored

scale,

logarithmic

gradUations

10,

taut

band

meter

movement,

linearity

Shielded

loop,

integral

part

hinged

cover

SECTION

GENERAL

DESCRIPTION

(Cont.)

Table

1-1.

Specifications:

Type FIM-21

Field

Strength

Meter

(Cont.)

Audio

Outputs:

Recorder

Output:

Lights:

Batteries

required):

Battery

Life:

Environmental:

Dimensions:

Weight:

External

Input:

Input

Switch:

METER

Switch:

Logarithmic

Dynamic Range:

1-2

Front

panel

loudspeaker,

weather

treated

cone

Headphone

jack,

high

and low Z

(disconnects

speaker)

0.4

volts

proportional

field

intensity

for

each

attenuator

range,

2000

ohm

source

resistance

Frequency

dial

and

meter;

panel

switch

for

night

use

Standard

volt

C-2,.,

IIDII

cells

volt

Alkaline

celfs

for

extended

life

very

low

temperatures

Greater

than

1000

readings

(re-

duced

life

with

frequent

use

lights

and/or

high

speaker

volume)

Continuous exposure

-10

0 F

+1300 F;

lower

temperature

operation

practical

for

IIreading

time

exposures

8-3/411

high,

11-1/2

wide,

5-1/8

deep

with

cover

closed;

3-7/8

deep

with

cover

open

(gripping

width)

Approximately

11-1/2

pounds

535

KHz

1605

KHz,

microvolts

volts

Selects

loop

antenna

(ANT)

Panel

Connector

(EXT)

Selects

normal

linear

(Lm)

loga-

rithmic

(LOG)

operation

db compressed

input

range

for

meter

and

recorder

output

SECTION

GENERAL

DESCRIPTION

(Cont.)

Table

1-2.

Specifications:

Type FIM-41

Field

Strength

Meter

Frequency Range:

Field

Strength

Range:

Accuracy

Calibration:

Accuracy

Range

Attenuator:

Selectivity

Bandwidth (6

db):

Rejection:

Image

Rejection:

Adjacent

Channel

Rejection:

Harmonic Measurement:

Panel

Meter:

Antenna:

Audio

Outputs:

Recorder

Output:

Lights:

Batteries:

1-3

.54

MHz

5.0

MHz

two

bands

Band

"A"

.535 -

1.61

MHz

Band

"B"

58 -

5.0

MHz

microvolts

per

meter

volts

per

meter

percent,

referenced

NBS

Standard

Field

percent

over

entire

range

and

tuning

band

KHz

nominal

with

multi-pole

hybrid

filter

minimum

80 db

(min.)

540

KHz

decreasing

(min.)

4.8

MHz

50 db

minimum

KHz

above and below

tuned

station

Capable

measuring

harmonics

excess

80 db below

fundamental

411

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

strength

for

each

attenuator

range,

2000

ohm

source

resistance

Frequency

dial

and

meter

with

panel

switch

for

night

use

Standard

1-1/2

volt

C-Z

IIDII

cells

1-1/2

volt.

Alka1;ine

cells

for

extended

life

very

low

tempera-

tures

(six

required)

SECTION

GENERAL

DESCRIPTION

(Cont.)

Table

1-2.

Specifications:

hYPe

FIM-41

Field

Strength

Meter

(Cont.)

Battery

Life:

Environmental:

Dimensions:

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

high

speaker

volume)

Continuous e:xposure _100

+1300

lower

temperature

operation

practical

for

"reading

time" e:xposures

8-3/4"

high,

1l-1/2

wide,

5-1/8"

deep

with

cover

closed;

3-7/8

deep

with

cover open

(gripping

width)

Approximate:q

pounds

540

KHz

5.0

MHz,

microvolts

volts

Selects

loop

antenna

(ANT)

Panel

Connector

(EXT)

Selects

normal

linear

(LJN)

loga·-

rithmic

(LOG)

operation

db compressed

input

range

for

meter

and

recorder

output

Carrying/Shipping

case

Unipod

SECTION

OPERATION

2.1

General

The

Frn-21

and

Frn-41

operating

controls

and

indicators

are

de-

scribed

this

section.

Also

provided

are

the

basic

operating

instructions

which

include

battery

voltage

testing,

meter

calibration,

measuring

field

strength,

and

use

these

instruments

null

detectors

for

Bridge

meas-

urements.

2.2

Operating

Controls

and

Indicators

All

operating

controls

and

indicators

are

located

the

front

panel

the

Frn-21

and

Frn-41

shown

figure

2-1.

Table

2-1

lists

these

controls

and

indicators

and

the

associated

functions.

Table

2-1.

Operating

Controls

and

Indicators

Control

Indicator

Function

FUNCTION

selector

switch

(S2)

FULL

SCALE

selector

switch

(Sl)

AUDIO

control

and

switch

(R3)

Selects

the

function

displ~ed

the

front

panel

meter

and

connects

battery.

OFF

battery

disconnected

from

circuit,

and

direct

connection

made

across

meter

terminals

protect

meter.

BATT

battery

output

voltage

CAL

TUNE

field

strength

antenna

input

developed

from

detected

output

receiver

amplifier.

CAL

Null

-compares

detector

outputs

from

receiver

and

calibrating

oscillator.

Selects

the

amount

attenuation

and

stages,

1 (20 db)

ratio

steps.

The

panel

marked

with

the

full-scale

direct-reading

field

strength

value

for

each

position.

CAL

applies

power

calibrating

oscil-

lator,

and

selects

volt

range

attenu-

ator.

Adjusts

level

audio

speaker

and

head-

phones.

Switch

disables

audio

amplifier

OUT

position.

2-1

Indice

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