Microwave Data Systems MDS 4310 - Figure A-2. Bell 202 T Compatible Modem Block Diagram

MDS 05-2415A01, Rev. A APPENDIX A A-3
PTT
DELAY
DATA MODULATOR
LOW PASS
FILTER
TX AUDIO OUT
U4A
U2
C3
MODEM RUS
R2
MARK
ADJ.
R3
SPACE
ADJ.
RX AUDIO IN
U4B
LOW PASS
FILTER
DATA
DEMODULATOR
U6
DCD
GATE
R25
THRESHOLD
ADJ.
C29
U6B
TXD
RXD
DCD
MODEM PTT
RTS
5 V
REGULATOR
+ 10V
10 V
REGULATOR
+ 13V IN
RE
U7 U8 + 5V
U5
U3
On-Board Voltage
Regulator & Power
Control
Figure A-2. Bell 202T Compatible Modem Block Diagram