User's Manual

RPT 633
TM1184 Issue 1 Page 3 - 1
SECTION 3
TECHNICAL DESCRIPTION
CONTENTS:
1. INTRODUCTION
TRANSMITTER
2. Power Supplies
3. Mode Select Circuit
5. Audio Input
6. Data Input
7. Crystal Oscillator
8. High Stability Version
9. Voltage Controlled Oscillator (VCO)
10. Phase Locked Loop (PLL)
11. Transmitter Keying
13. Frequency Multiplier
14. Band Pass Filter
15. Driver Stages
16. Output Amplifier
VOX KEYING MODULE
17. General
18. Analogue Path
19. Data Mode
20. Decoding
OPERATION
21. General
22. Power Up
23. Data Path
24. Switching to Speech
29. Switching from Speech to Data
TABLES Page
1. VOX Keying and Mode Signals 3-7