Fm Gain - Agilent Technologies 83620A Service Manual

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18. FM Gain

Description and Procedure
his adjustment sets the gain on the FM driver assembly to match the YO FM
coil sensitivity, and to provide a 10 MHz/V FM input sensitivity. he function
generator is set to provide FM at a 1 MHz rate and a 2.404 MHz deviation.
his corresponds to a modulation index of 2.404, which should result in no
power in the carrier. FM gain is adjusted to minimize the RF output power.
1. Connect the equipment as shown in Figure 3-32. Preset all instruments and
let them warm up for at least one hour.
Figure 3-32. FM Gain Adjustment etup
Function Generator
Spectrum Analyzer
HP 8360
Equipment
HP 3325A
HP 8566B
Adjustments 3-109
FM Gain