Codan Radio MT-3 - Manual (Page 33)

MT-3 ANALOG RADIO SYSTEMS | USER GUIDE
Chapter 4: Analog System Block Diagrams Page 25
Figure 4-3: Analog / Digital Paging Transmitter Block Diagram
P
A
GING ENCODER
FM TRANSMITTER
P
A
GING MODULA
T
OR
RF OUT
AUDIO
PROCESSOR
RF POWER AMPLIFIER
1 KHz TONE
@ -8.0 dBm
= 60% MAX. MOD.
2 LVL DATA 4 LVL DATA
PTT
OSCILLATOR
AGC PREAMP
& PRE-EMPHASIS
BALANCED AUDIO
BALANCED LEVEL
COMPRESSION
MAXIMUM DEVIATION
DIR MOD LEVEL
PTT DIR
MOD
I/P
ANALOG
A / D SEL
+1.6 KHz -1.6 KHz +4.8 KHz -4.8 KHz
BESSEL FILTER
BANDPASS
ADJUST
OCXO 10 MHz
PLL
INT / EXT REF
PHASE
CORRECTION
EXTERNAL
REFERENCE
A/D SEL
I/P
LIMIT
ADJUST
REF IN
REF IN
REF OUT