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Chapter 2 Performing FM Transmitter Tests
2.0.1 Scope of Test
This test is used to evaluate the following performance characteristics of an FM
Transmitter:
•
Transmitter Power
•
Transmitter Frequency
•
Transmitter Distortion
•
Voice Modulation Level
•
Squelch Tone Frequency
•
Squelch Tone Modulation Level
2.0.2 DUT Parameters/Characteristics
The example in this section assumes the following DUT characteristics and settings; adjust
settings according to the operational capabilities of the DUT.
Parameter
Transmit Frequency
Transmit Power
Transmit Modulation
Maximum Deviation
Maximum Modulation Frequency
Microphone/Mod Input
Modulation Input Level for Test Deviation
Squelch Tone Deviation
Squelch Tone Frequency
2.0.3 Equipment Needed
The following equipment is required to perform the test procedures defined in this section:
•
CX100 ComXpert
•
Audio cable and MIC/Audio Adapter combination capable of interfacing an audio
signal from the CX100 audio output to the transmitter modulation input (typically the
microphone input on the transmitter).
•
RF Coaxial Cable
Rev 000
2 - 2
Table 2-1 FM Transmitter Test - DUT Settings
CX100 ComXpert Test and Measurement Guide
Setting
151.1 MHz
5 Watts
FM
2.5 kHz
3 kHz
AC Coupled, Hi-Z
20 mV
500 Hz
67 Hz
22144016
October 2022
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