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PANEL DESCRIPTION
1
MICROPHONE CONNECTOR INFORMATION
r PTT
y Microphone input
w Frequency up/down
u GND
q +8 V DC output
i DATA IN
t GND (Microphone ground)
e M8V SW
r PTT
y Microphone input
w Frequency up/down
u GND
q +8 V DC output
i Squelch switch
t GND (Microphone ground)
e M8V SW
Rear panel view
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HM-151
HM-103
CAUTION:DO NOT short pin 1 to ground as
this can damage the internal 8 V regulator.
PIN NO. FUNCTION
DESCRIPTION
1
• When HM-151 is connected
• When HM-103 is connected
3
8
+8 V DC output
Max. 10 mA
2
Frequency up
Ground
Frequency down
Ground through 470
HM-151 connection
Goes to ground to connect
3
HM-151 connection
Open to pin 8 as SQL
HM-151 data
Control signal input
PIN NO. FUNCTION
DESCRIPTION
1 +8 V DC output
Max. 10 mA
2
Frequency up
Ground
Frequency down
Ground through 470
8
Squelch open
“LOW” level
Squelch closed “HIGH” level
DMicrophone connector