CT Systems Wavetek 2500 - Page 48

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SECTION 2

TRANSMI'ITER MEASUREMENTS

3.4.7

Off

the

Air

Monitoring

The

2500

receiver

provides

continuous

frequency

coverage

from

400

kHz

to

999.9999

MHz

with

good

sensitivity

and

intermod

rejection.

Receiver

sensitivity

is

typically

10

uV

@

10

dB

for

"off

the

air"

monitoring.

Refer

to

Figure

3-9

for

the

following

test

procedure.

1)

Attach

antenna

to

RF

in/out

connector.

2)

Select

REC

mode.

3)

Program

the

frequency

to

be

monitored

in

MHz

using

the

data

entry

keys

followed

by

the

ENTER

key

..

·

4)

Adjust

squelch

control

for

sensitivity

required.

5)

Select

COUNT

RF

to

display

the

actual

frequency

of

received

RF

signals

above

100

mV.

Select

COUNT

Error

to

display

frequency

error

of

the

received

signal.

Select

COUNT

AF

to

display

the

frequency

of

the

audio

modulation

on

the

carrier.

6)

Select

DEV

to

display

the

FM

deviation

on

the

carrier.

7)

Select

SHIFT

WATTS

to

display

the

signal

strength.

8)

Select

SUBTONE

to

display

CTCSS

tone.

9)

Select

DEV

MARK

and

connect

"DEMOD"

connector

to

an

external

oscilloscope

to

calibrate

demodulated

audio

to

±600

Hz

or

a

±5

kHz

marker.

2500-MANUAL

PAGE

36

SECT!ON-3