
VER
FY
BEflTNOTE
USER'S DUT
F»F OUT •
8662A
■■■-
FM IK FJF OUT -
I 1S4QH
a
3 5S1R
D 10 0 0
1 1 3585R
50 Ohn ■
Figure 6-5. DC FM Connect Diagram
10 MHz A can be used as an external time base for the HP 8662A/63A
to increase the tuning capability. The phase noise performance of the
HP 11848A 10 MHz A is better than DC FM yet slightly worse than the
HP 10811 internal reference for the HP 8662A/63A. 10 MHz A has a
10 Hz/V tuning constant and can be tuned over ±10V. To calculate the
VCO Tuning Constant at the output frequency multiply 10 Hz by the
10 MHz multiple of the output frequency. For example, if the output is set
to 900 MHz, the VCO Tuning Constant would be:
90 x 10 Hz = 900 Hz/V
Using the full Voltage Tuning Range of ±10V would result in a Peak
Tuning Range (PTR) of 9 kHz.
RF Sources 6-11
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