Operation Manual

10
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PANEL DESCRIPTION
• MICROPHONE CONNECTOR
■ Microphone (HM-103)
qUP/DOWN SWITCHES [UP]/[DN]
Change the operating frequency.
•Push and hold to change the frequency continuously.
•Tuning step is 50 Hz when no TS indicator appears.
wLOCK SWITCH [LOCK]
Locks the [UP]/[DN] switches.
ePTT SWITCH [PTT]
Push and hold to transmit; release to receive.
DN UP
LOCK
OFF ON
q
w
e
TECHNICAL INFORMATION
PIN NO. FUNCTION DESCRIPTION
1 +8 V DC output Max. 10 mA
2
Frequency up Ground
Frequency down Ground through 470 Ω
8
Squelch open “LOW” level
Squelch closed “HIGH” level
r PTT
y Microphone input
w Frequency up/down
u GND
q +8 V DC output
i Squelch switch
t GND (Microphone ground)
e AF output
Rear panel view
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• HM-103 SCHEMATIC DIAGRAM
4700p
4700p
10µ
0.33µ
+
+
MICROPHONE
MIC
ELEMENT
2k
2.2k
470
DOWN
LOCK UP
PTT
RECEIVE
TRANSMIT
MICROPHONE
CABLE
MICROPHONE PLUG
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CAUTION:DO NOT short pin 1 to ground as
this can damage the internal 8 V regulator.
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