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To change these values, press the Instr. Params| key,
and enter the carrier (center) frequency at which
you wish to measure your synthesizer (5 MHz to
1.6 GHz). (Enter the same frequency for the Detector
Input Frequency.)
8. Enter the VCO Tuning Constant.
If you are going to use DC FM tuning, enter an FM
deviation setting that will provide the HP 3048A with an
adequate Drift Tracking Range for the measurement.
If you are going to use either of the 10 MHz sources
to tune the HP 8662/3, or if you are going to use
EFC tuning, use the following equation to calculate
the appropriate VCO Tuning Constant to enter for
the measurement.
VCO Tuning Constant = T x Carrier Frequency
Where T = :
EFC = 5 E - 9
10 MHz A = 1 E - 6
10 MHz B = 10 E - 6
For example, to calculate the Tuning Constant value
to enter for EFC tuning when the center frequency is
300 MHz:
(5£ - 9) x (300£ + 6) = (1500£ - 3) = 1.5
3-44
Signal Source Applications
rev.09AUG89
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