Codan Radio MT-4R - Manual (Page 31)

UG-001 Daniels MT-4R and MT-4D Radio Systems
www.danelec.com
Chapter 4: P25 System Block Diagrams 23
User
Guide
Figure 4-2: P25 Base Station Block Diagram
BASE OR REPEA
TER
RECEIVER
BASE OR REPEA
TER
TRANSMITTER
BASE
CONTROLLER
BALANCED
AUDIO INPUT
1 KHz TONE @ -8.0 dBm
= 60% MAX. MOD.
AUXILIARY BALANCED
INPUT
BALANCED AUDIO OUTPUT
1 KHz TONE @ 60% MAX MOD = -8.0 dBm
AUDIO
OUTPUT
(TO SYSTEM
MONITOR SPEAKER)
AUXILIARY BALANCED
OUTPUT
AUDIO LEVEL
CONTROLS
1 KHz TONE
@ 60% MAX MOD
= 0 dBm
COR
1 KHz TONE
@ 0 dBm
= 60% MAX MOD
PTT
INPUT
RF IN
FM ANALOG
OR
C4FM DIGIT
AL
A / D
DETECT
AD
CTCSS / DCS
DECODE
NAC / TGID
DECODE
DE-VOCODER
D / A
CONVERTER
A / D
CONVERTER
FRONT
END
RF BOARD LOCAL
OSCILLATOR
IF AMP & DEMOD
AUXILIARY
PTT
OPTICAL
ISOLATOR
OPTICAL
ISOLATOR
AUXILIARY
COR
RF OUT
FM ANALOG
O
R
C4FM DIGIT
AL
A / D
SELECT
A
D
CTCSS / DCS
ENCODE
NAC/TGID/SID
ENCODE VOCODER
A / D
CONVERTER
RF POWER AMPLIFIER
MODULATOR
D / A
CONVERTER
OPTIONAL
ENCRYPTION
OPTIONAL
DECRYPTION