Operating Theory- Pll Freq. S Y N Th E S Ize R - Cobra 19 Plus Manual

OPERATING THEORY OF PLL FREQUENCY SYNTHESIZER
1. Fundamental Theory Of PLL Circuitry
The purpose of
multiple number
frequency with quartz erystal accuracy.
A basie PLL circuit consists of reference oscillator, VCO, phase
comparator and DC filter (Iow pass filter).
With the above
frequency is effectively locked to the reference oscillator, and
its accuracy is as good as the reference oscillator.
Since the CB
multiple of 5
of programable frequencies that are spaced apart by 10 kHz.
Therefore the basie PLL circuitry is expanded as follow:
FOR MODEL 19 PLUS
PLL (Phase Locked Loop) circuit is to generate
programable frequencies from a signal reference
circuit the VCO (Voltage Controlled Oscillator)
radio's adjacent
kHz), our purpose should be to produce multiples
channel spacing is 10 kHz (or
19 PLUS -1-