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standard oscillator to produce a voltage to control VCO (vol-
COUNTER
ASS'Y
UNIT (OPTION) IX60-1020-00)
tage controlled oscillator). It also forms a full electronic IF
sh~ft loop using an external carrier signal. The VCO unit is
.
composed of FET type osc~llators for each band. buffer am-
pl~f~er circuit. and the oscillator shut off circuit at the time of
fault of the PLL circuit. The oscillator
frequency is controlled
i
by the control voltage from the PD Board. The bands of
both units can be selected by means of the diode
sw~tches.
Counter
Ass'y
Unit
This
unit is composed of the counter mixer board that
produces
operating
frequencies by mixing the VCO output
(local oscillator stgnal for the mixer) with carrler signal, and
the counter board that counts the frequencies
in
d~gits.
These units are housed in a r~gid shielding case. Since the
frequencies are read by synthesizing all the
local oscillator
stgnals, accurate operating frequencies are always counted
under any operating conditions. The counter output is pick-
ed up as a signal to
dr~ve the indicating tubes and is fed to
the
d~splay unit.