Codan Radio Communications VT-3-150-SN User Manual
1-4
Audio Processor Board Instruction Manual
1.3
FM Audio Processor Board Pin Connections
Figure 2
Pin Connection Diagram
1.4
Factory Configuration
The MT-3 FM Audio Processor is factory configured as follows:
Table 2
Factory Configuration
Parameter
Specification
Maximum Deviation
±2.5 kHz (Narrowband),
±5.0 kHz (Wideband).
±5.0 kHz (Wideband).
Microphone Input
1 kHz signal at -10 dBm gives ±60% rated system deviation
1 kHz signal compression set at ±84% rated system deviation
1 kHz signal compression set at ±84% rated system deviation
Audio Balanced Input
pre-emphasis response
pre-emphasis response
1 kHz tone at -8 dBm gives ±60% rated system deviation
1 kHz signal compression set at ±84% rated system deviation
1 kHz signal compression set at ±84% rated system deviation
Subtone Input 1
100 Hz tone at -18 dBm gives ±500 Hz (Wideband)
±350 Hz (Narrowband) deviation
±350 Hz (Narrowband) deviation
All other audio inputs
Disabled
PCB
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
P1
P2
P4
P3
Balanced Input
END VIEW
Mic Input
Subtone Input 1
+8V
+9.5V
Low Frequency
Direct Mod Output
Voice
And Subtone
Output
-8
dBm
-10
dBm
-18
dBm
Surface Mount Side
0
dBm