User's Manual

3-20
Table 3-7. Power Connector J5 (CA110821-1) Pin Characteristics
PIN
FUNCTION
1 12V Battery 1 - Negative / Transceiver Ground for External Power Source
2 12V Battery 2 - Negative
3 No Connection for Lithium Battery, Grounded in a NiCad Battery.
4 12V Battery 1 - Positive
5 12V Battery 2 - Positive / +24 V transceiver power from External Power Source
6 No Connection
Table 3-8. Handset Connector J4 (GC283F-1-050) Pin Characteristics
PIN
FUNCTION
A GND - Ground
B
PT OUT. Adjustable from 0 to approximately 6.0 V Peak into 600 
C PTT-N. Push-to-Talk, . Ground to Transmit
D
PT IN. 1 mV nominal for full modulation into 150  load.
E Connected to pin B. (See Pin B)
F
Squelch. Receiver Squelch Output for RETRANSMIT, 0 TO +5v, 100 k pull-up to
+5Vdc. Logic gate output with a 50  series resistor.