MDS 2141A01, Rev. A TABLE OF CONTENTS iii
CHAPTER 5—THEORY OF OPERATION
RECEIVE FRONT END----------------------------------------------------------------------------------------------- 5-1
HIGH IF ------------------------------------------------------------------------------------------------------------------ 5-1
LOW IF ------------------------------------------------------------------------------------------------------------------- 5-1
RECEIVE AUDIO ------------------------------------------------------------------------------------------------------ 5-1
SQUELCH --------------------------------------------------------------------------------------------------------------- 5-2
POWER SUPPLY------------------------------------------------------------------------------------------------------- 5-2
TRANSMIT POWER AMPLIFIER---------------------------------------------------------------------------------- 5-3
ANTENNA SWITCH -------------------------------------------------------------------------------------------------- 5-3
DIRECTIONAL COUPLER------------------------------------------------------------------------------------------- 5-3
KEYLINE AND CONTROL CIRCUITS --------------------------------------------------------------------------- 5-3
RADIO DISABLE ------------------------------------------------------------------------------------------------------ 5-3
AUDIO/DATA MODULATION INPUT SWITCHING---------------------------------------------------------- 5-4
MICROCONTROLLER/EEPROM ---------------------------------------------------------------------------------- 5-4
DIAGNOSTICS DATA CONTROL --------------------------------------------------------------------------------- 5-4
TRANSMIT AUDIO --------------------------------------------------------------------------------------------------- 5-5
PLL/SYNTHESIZER--------------------------------------------------------------------------------------------------- 5-5
RS-232 DATA INTERFACE------------------------------------------------------------------------------------------ 5-5
LED INDICATORS ---------------------------------------------------------------------------------------------------- 5-5
CHAPTER 6—TROUBLESHOOTING
This section contains basic field troubleshooting assistance for the transceiver system.
APPENDIX A—1200 BPS BELL 202T COMPATIBLE MODEM
INTRODUCTION ----------------------------------------------------------------------------------------------------- A-1
SPECIFICATIONS ---------------------------------------------------------------------------------------------------- A-1
ALIGNMENT ---------------------------------------------------------------------------------------------------------- A-1
THEORY OF OPERATION------------------------------------------------------------------------------------------ A-2
APPENDIX B—4800 BPS FSK MODEM
INTRODUCTION ----------------------------------------------------------------------------------------------------- B-1
SPECIFICATIONS ---------------------------------------------------------------------------------------------------- B-1
INSTALLATION ------------------------------------------------------------------------------------------------------ B-1
ALIGNMENT ---------------------------------------------------------------------------------------------------------- B-1
THEORY OF OPERATION------------------------------------------------------------------------------------------ B-1
APPENDIX C—9600 BPS FSK MODEM
INTRODUCTION ----------------------------------------------------------------------------------------------------- C-1
SPECIFICATIONS ---------------------------------------------------------------------------------------------------- C-1
INSTALLATION ------------------------------------------------------------------------------------------------------ C-1
ALIGNMENT ---------------------------------------------------------------------------------------------------------- C-1
THEORY OF OPERATION------------------------------------------------------------------------------------------ C-1
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