Panel Description ..................................... 1; I Microphone (Hm-103) - Icom I706MKTMG Instruction Manual

I Microphone (HM-103)

DN
–
UP/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.
TECHNICAL INFORMATION
• MICROPHONE CONNECTOR
Rear panel view
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• HM-103 SCHEMATIC DIAGRAM
MICROPHONE
+
4700p
10µ
MIC
ELEMENT
2.2k
PTT RECEIVE
TRANSMIT
–
LOCK
UP
OFF ON
—
PIN NO.
1
2
8
2k
MICROPHONE PLUG
MICROPHONE
CABLE
0.33µ
+
4700p
DOWN UP
470
˜
—
LOCK SWITCH [LOCK]
Locks the [UP]/[DN] switches.
˜
PTT SWITCH [PTT]
Push an
d hold to transmit; release to receive.
FUNCTION
+8 V DC output
Frequency up
Frequency down
Squelch open
Squelch closed
Caution:
DO NOT short pin 1 to ground as
this can damage the internal 8 V regulator.
1 2345678
PANEL DESCRIPTION
DESCRIPTION
Max. 10 mA
Ground
Ground through 470 Ω
"LOW" level
"HIGH" level
1
8