Specifications

Table 1 - PTT Priorities and TX Audio Details vs. MUX Logic Levels
PTT
PRIORITY
SOURCE PTT INPUT AUDIO
INPUT
INPUT LEVEL
RMS @ 1kHz
LEVEL
ADJUSTMENT
FREQUENCY
RESPONSE
MUX (U502)
Pin
9
Pin
10
Pin
11
1 Local
Microphone
Mic. Connector
Pin 3
Mic. Connector
Pin 4
6 mv None Pre-emphasized;
300 Hz to 3 kHz
010
2 Remote Audio DB-15
Connector
Pin 2
DB-15
Connector
Pin 7
25 mv to 250
mv
R553 Pre-emphasized;
300 Hz to 3 kHz
011
3 Data Input DB-15
Connector
Pin 4
DB-15
Connector
Pin 11
TTL/CMOS
RS-232
100 mv Audio
None Flat
5 Hz to 2.4 kHz
111
4 Interconnect DB-15
Connector
Pin 5
DB-15
Connector
Pin 14
25 mv to 250
mv
R548 Pre-emphasized;
300 Hz to 3 kHz
001
5 Receiver Receiver
Squelch
De-emphasized;
Receive Audio
(only available
internally)
None Pre-emphasized;
300 Hz to 3 kHz
000
NOTES: Priority 1 is the highest level. 0=0 to 0.8 volts
"MUX" is an abbreviation for MULTIPLEXER. 1=3.5 to 5.0 volts
AE/LZB 119 1882 R1B
19