Codan Radio MT-3 - Manual (Page 31)

MT-3 ANALOG RADIO SYSTEMS | USER GUIDE
Chapter 4: Analog System Block Diagrams Page 23
Figure 4-2: MT-3 Analog Repeater and/or Base Station Block Diagram
FM RECEIVER
FM TRANSMITTER
CONTROLLER
RF IN
RF OUT
FRONT
END
LOCAL
OSCILLATOR
SQUELCH CIRCUITRY
IF AMP & DEMOD
DE-EMPHASIS
AUDIO
PROCESSOR
RF POWER AMPLIFIER
1 KHz TONE @ -8.0 dBm
= 60% MAX. MOD.
AUXILIARY BALANCED
INPUT
1 KHz TONE @ 60% MAX MOD = -8.0 dBm
AUXILIARY BALANCED
OUTPUT
1 KHz TONE
@ 60% MAX MOD
= 0 dBm
1 KHz TONE
@ 0 dBm
= 60% MAX MOD
AUXILIARY
PTT
OPTICAL
ISOLATOR
VOICE BAND
FILTER
CTCSS
DECODER
OPTIONAL
CTCSS
ENCODER
DISC O/P RX MUTE
OPTICAL
ISOLATOR
REPEATER CONTROL
HANG TIMER
COR
AUXILIARY
COR
OSCILLATOR
TIME OUT
TIMER
AGC PREAMP
& PRE-EMPHASIS
BALANCED AUDIO
BALANCED LEVEL
COMPRESSION
MAXIMUM DEVIATION
SUBTONE LEVEL
PTT SUB
TONE 1
I/P
DISTRIBUTION AMP
AUDIO LEVEL
SUMMING AMP
FLAT
LOW PASS
FILTER
SQUELCH GATES
DE-EMPHASIS AUDIO (TO SYSTEM REGULATOR SPEAKER)
FLAT AUDIO
(NO CONNECTION)
DISCRIMINATOR
LPF O/P
(NO CONNECTION)
BALANCED AUDIO