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196 Chapter 6
C:\Spk\Ref\RefGuideRevE\Anlgscrn.fm
Analog Measurements - Screens and Control Fields
Control Fields for Analog Measurements
Filter 2
This field selects an audio frequency filter which can be used to
condition the audio signal before it is analyzed by the audio frequency
analyzer.
The following filter choices are available:
• 300Hz LPF
• 3kHz LPF
• 15kHz LPF
• > 99kHz LP
•6 kHz BPF
Operating Considerations
The audio from the Test Set’s speaker is not affected by Filter 1 or
Filter 2 settings.
Screens on which this field is displayed
AF ANALYZER
FM Coupling
This field alters the FM modulator to allow DCFM from internal and
external modulation sources. The upper subfield selects ac or dc
coupling between the RF generator’s frequency modulator and the
ANALOG MODULATION IN connector. The lower subfield, DC FM
Zero, zeroes any dc bias that exists when FM Coupling is set to DC.
Operating Considerations
This field should be set to DC whenever the AFGen2 To field is set to FM;
this provides better modulation response at low data rates.
Screens on which this field is displayed
RF GENERATOR