JEM Radio II
Operation Guide
Power Connector (4-Pin)
Rear Handset Connector (6-Pin)
PIN
Signal
Description
A*
+ 74 Vdc
Primary isolated input voltage
B
- 13.6 Vdc
Radio common (chassis)
C*
- 74 Vdc
Primary isolated input voltage
D
+ 13.6 Vdc
Regulated radio voltage input
*Only one supply voltage can be
used at a time.
PIN
Signal
Description
A
Mic Audio
Modulation input from handset
microphone
B
Mic Ground
Mic Audio return (common
with radio chassis)
C
PTT
Push-To-Talk input
D
PTT Ground
PTT return path (common with
radio chassis)
E
Receive Audio
Audio input to receiver
element in handset
F
Hook Switch
Optional input connected to
the handset cradle switch
13
