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1. Estimate the system's Capture Range (using the
VCO source parameter values entered for this
measurement):
Capture
Capture
Range (Hz) =
Range (Hz) =
VCO Tuning Constant (Hz/V) >
10
(Hz/V) x
10
< VCO Tuning Range (V)
JY1-
Hz
As you observe the beatnote on the HP 3561A in the
frequency domain, reduce the beatnote until it is to
the left of the first major graticule on the screen.
Adjust the beatnote by adjusting the center frequency of
the HP 8640B.
Note
If you are able to locate the beatnote, but it distorts and
then disappears as you adjust it towards 0 Hz, your sources
are injection locking to each other. Set the beatnote to the
lowest frequency possible before injection locking occurs
and then refer to Minimizing Injection Locking in the Problem
Solving section of this chapter for recommended actions.
Signal Source Applications
3-37
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