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Theory of Operation
2 - 8
68P02963C70-O
Frequency Generating Section
The frequency generating section contains the following components
(see Figure 5):
•
REF. Oscillator - TCXO
•
Main Synthesizer - consists of the WPIC’s PLL and the Main Voltage Con-
trolled Oscillator (VCO).
•
2nd Local Oscillator (LO) VCO together with the LMX Dual Synthesizer.
•
Offset VCO together with the LMX Dual Synthesizer.
Figure 5 Frequency Generation - Block Diagram
Of fset VCO
Second LO
Dual Synthesizer
(U808)
Main VCO
Main Synthesizer
493.65-513.65 MHz to RX Mixer
113.65 MHz to Offset Mixer
493.65-513.65 MHz to TX Mixer
Reference
Oscillator - TCXO
Divider
OSC_IN
DOI F
IF Section
RF Section
DORF
219.3MHz
FINIF
FINRF
50kHz
100kH z
OSC_IN
WPI C
XTALBASE
PRSCI N
CPGITR
Data
LOIN
LPF
LPF
LPF
Osc.
Osc.
Osc.
Buf fer
Содержание MTH500
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Страница 14: ...Foreword xiv 68P02963C70 O THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 18: ...Overview 1 4 68P02963C70 O THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 50: ...Theory of Operation 2 32 68P02963C70 O THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 76: ...Troubleshooting 3 26 68P02963C70 O Offset VCO Test ...
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Страница 82: ...Programming the Radio 4 4 68P02963C70 O This page left blank intentionally ...
Страница 100: ...Maintenance 5 18 68P02963C70 O Figure 23 Exploded View 1 2 3 4 5 7 6 X6 8 ...
Страница 101: ...Maintenance 68P02963C70 O 5 19 Figure 24 Exploded View of Chassis Assembly 9 12 13 10 11 14 ...
Страница 102: ...Maintenance 5 20 68P02963C70 O ...
Страница 103: ...MTH500 Detailed Service Manual COMPONENT BOARD LAYOUTS 68P02963C70 O 6 1 Component Board Layouts ...
Страница 104: ...MTH500 Detailed Service Manual COMPONENT BOARD LAYOUTS 6 2 68P02963C70 O This page intentionally left blank ...
Страница 109: ...MTH500 Detailed Service Manual Schematic Diagrams and Parts Lists 68P02963C70 O 6 7 Schematic Diagrams and Parts Lists ...
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