Codan Radio MT-4R - Manual (Page 29)

UG-001 Daniels MT-4R and MT-4D Radio Systems
www.danelec.com
Chapter 4: P25 System Block Diagrams 21
User
Guide
Figure 4-1: P25 Repeater Block Diagram
REPEA
TER
RECEIVER
REPEA
TER
TRANSMITTER
REPEA
TER
CONTROLLER
SUBRACK /
MOTHERBOARD
RF IN
FM ANALOG
OR
C4FM DIGIT
AL
RF OUT
FM ANALOG
O
R
C4FM DIGIT
AL
FRONT
P
ANEL
RJ45 CABLE
FRONT
P
ANEL
RJ45 CABLE
ANALOG COR
A / D
DETECT
A
D
CTCSS / DCS
DECODE
NAC / TGID
DECODE
DE-VOCODER
AUDIO OUTPUT (TO SYSTEM MONITOR 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
FRONT
END
RF BOARD LOCAL
OSCILLATOR
IF AMP & DEMOD
A / D
CONVERTER
RF POWER AMPLIFIER
MODULATOR
D / A
CONVERTER