Codan Radio MT-4E Paging - Manual (Page 49)

MT-4E PAGING SYSTEMS | USER GUIDE
Chapter 5: Technical Information Page 41
P
A
GING ENCODER
TRANSMITTER
P
A
GING MODULA
T
O
R
RF OUT
UNIVERSAL
DAUGHTER BOARD
RF POWER AMPLIFIER
1 KHz TONE @ -8.0 dBm = 60% MAX. MOD.
2 LVL DATA 4 LVL DATA
PTT
OSCILLATOR
BALANCED AUDIO
BALANCED 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
JU1 (Y)
AUDIO SIGNAL
PROCESSING
DIR MOD DSP BYPASS A/D MODE CONTROL JU13 (Y)
Figure 5-1: MT-4E Paging Transmitter Block Diagram