M29-1 Fm Reference - Wavetek 3000 Instruction Manual

THEORY OF OPERATION
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3 .10 M29-1 - FM REFERENCE
Figure 3-14 . M172 Sweep Drive/DAC
TO MHz
STEPS
TO WIDE
VCO
The M29-1 is a voltage to frequency con-
verter, the output of which is used as
a phase lock reference in the M33 . The
module includes a voltage variable cur
rent source which feeds (determines the 3 .10 .1 Current Sources
frequency of) a square wave oscillator .
(See Figure 3-15 .) Zero volts in yields This
circuit provides both a positive
2 MHz out . and a negative source of current .
The