Codan Radio MT-4E Analog and P25 Digital - User Guide User Manual
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MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | USER GUIDE
Chapter 4: MT-4E Radio System Block Diagrams Page 21
Figure 4-1: MT-4E Repeater Block Diagram
RECEIVER
TRANSMITTER
REPEA
TER
CONTROLLER
SUBRACK /
MOTHERBOARD
RF IN
FM ANALOG
OR
C4FM DIGIT
AL
RF OUT
FM ANALOG
OR
C4FM DIGIT
AL
FRONT
P
A
NEL
RJ45 CABLE
FRONT
P
A
NEL
RJ45 CABLE
ANALOG COR
A / D
DETECT
A
D
CTCSS / DCS
DECODE
NAC / TGID
DECODE
DE-VOCODER
AUDIO
OUTPUT
(TO SYSTEM REGULATOR
SPEAKER)
LVDS
SERIAL
DATA
A / D
SELECT
A
D
CTCSS / DCS
ENCODE
NAC
ENCODE
VOCODER
SUBRACK /
MOTHERBOARD
ANALOG PTT
LVDS
SERIAL
DATA
RX TO TX
ENABLE
AUDIO
INPUT
(NOT USED)
DIGITAL COR
DIGITAL PTT
1 KHz TONE
@ 60% MAX. MOD.
= -8.0 dBm
1 KHz TONE
@ -8.0 dBm
= 60% MAX. MOD.
D / A
CONVERTER
A / D
CONVERTER
FILTER
RF PRESELECTOR
SYNTHESIZER
(LO)
IF AMP &
DEMOD
A / D
CONVERTER
RF POWER
AMPLIFIER
SYNTHESIZER
(MODULATOR)
D / A
CONVERTER