Codan Radio MT-4E Analog and P25 Digital - User Guide - Manual (Page 29)

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