Icom HF/VHF/UHF ALL MODE TRANSCEIVER TV Receiver User Manual


 
•MICROPHONE CONNECTOR
8
1
PANEL DESCRIPTION
Microphone (HM-103)
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.
LOCK SWITCH [LOCK]
Locks the [UP]/[DN] switches.
PTT SWITCH [PTT]
Push and hold to transmit; release to receive.
DN UP
LOCK
OFF ON
TECHNICAL INFORMATION
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
PTT
Microphone input
Frequency up/down
GND
+8 V DC output
Squelch switch
GND (microphone ground)
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 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.