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FM Deviation
The audio reference device for use with this test offers three tone frequencies (500 Hz, 1 kHz
and 2 kHz) and two volume levels.
On/off
switch
The single-tone 1 kHz AF generator previously supplied with the test box can also be used.
The illustration below shows how to set up for measuring
the VHF FM Deviation on CH 6:
The test procedure is as follows:
1) Select FM Deviation on the test box,
2) Hold the audio reference device / AF generator close to the transmitter's microphone
and activate the tone,
3) Activate the transmitter on CH 6,
4) Press OK on the test box. Maximum deviation and actual deviation are shown on the LCD
display,
5) Press OK on the test box, and the maximum deviation value will be stored in the memory,
6) Stop the transmitter.
Example of Printout from the Memory:
VHF # 1 Time/date: 08:22:24 / 21-11-2011
Maximum deviation: 1.1 kHz
AM / 123.1 MHz
The AM / 123.1 MHz test mode allows you to measure the frequency and to check the
modulation of an AM signal transmitted on 123.1 MHz.
Use the same setup as with measuring the FM deviation.
Selector
Long press: Change frequency
Short press: Change volume
17
VHF TRANSMITTER
ANT.
AUDIO
REFERENCE
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