Kenwood TS-820 Operating Manual page 30

Ssb transceiver

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standard oscillator t o produce a voltage to control VCO (vol-

C O U N T E R A S S ' Y

U N I T (OPTION)

I X 6 0 - 1 0 2 0 - 0 0 )

tage controlled oscillator). It also forms a full electronic IF

s h ~ f t loop using an external carrier signal. The VCO unit is

composed of FET type osc~llators for each band. buffer am-

p l ~ f ~ e r

circuit. and the oscillator shut off circuit at the time of

fault of the PLL circuit. The oscillator frequency is controlled

by the control voltage from the PD Board. The bands of

both units can be selected b y 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

d~gits.

These units are housed in a r ~ g i d 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 d r ~ v e the indicating tubes and is fed to

the d~splay unit.

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