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Phase
Modulation
(OM)
3-3
Frequency Counter and
Display
3"3
Tune
(Spin
Wheel) Encoder
3-4
CHAPTER
4
TECHNICAL
DESCRIPTION
INTRODUCTION
LOGIC
CIRCUIT
SYMBOLS
MAIN
OSCILLATOR
(VCOl)
ASSEMBLY
19-0841
4-1
LOGIC
PCB
ASSEMBLY
4-2
300kHz
Reference Frequency
4-2
Fine
Tune
Reference
4-2
Tuning
(Spin
Wheel)
Input
4-3
Pul se
Multiplier
and
Up/Down
Detector
4-3
Step
Switch
4-3
Pulse
Divider
4-3
Principles
of
Channel Spacing
Control
4-4
Channel Spacing
Control Circuit
4-5
DIVIDER
AND
PHASE
DETECTOR ASSEMBLY
19-0846
4-6
Introduction
4-6
'N'
Counter
4-7
Digit Blanking
4-7
HF
Divider
4-8
Phase Detector
4-9
Read
Only
Memory (ROM)
4-10
Half
Octave Output
4-11
End
Stop Control
4-1
1
OUTPUT SYSTEM ASSEMBLY
1
9-0843
4-1
1
Introduction
4-11
RF
Input
4-1
1
Range
Switching
4-11
Range
5
Filtering
and
Half
Octave
Selection
4-11
Range 4
Division
and
Filtering
4-12
Range
3 Division
and
Filtering
4-12
Range
2 Division
and
Filtering
4-12
Range
1
Mixer and
Filtering
4-13
RF
Output
Amplifier
4-13
Output Metering
4-13
Amplitude Modulator
Stage
4-13
ALC
and
Carrier Level Setting
4-13
X2
Output
4-14
AM
Audio
Input
4-14
9081
&
9082 Vol.2
Contents
(2)
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