Codan Radio MT-4E Analog and P25 Digital - User Guide - Manual (Page 31)

MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | USER GUIDE
Chapter 4: MT-4E Radio System Block Diagrams Page 23
Figure 4-2: MT-4E Base Station Block Diagram
RECEIVER
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
REGULATOR 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
AUXILIARY
PTT
OPTICAL
ISOLATOR
OPTICAL
ISOLATOR
AUXILIARY
COR
RF OUT
FM ANALOG
OR
C4FM DIGIT
AL
A / D
SELECT
A
D
CTCSS / DCS
ENCODE
NAC/TGID/SID
ENCODE VOCODER
A / D
CONVERTER
RF POWER AMPLIFIER
SYNTHESIZER (MODULATOR)
D / A
CONVERTER
OPTIONAL
ENCRYPTION
OPTIONAL
DECRYPTION
FILTER
RF PRESELECTOR
SYNTHESIZER
(LO)
IF AMP & DEMOD