PANEL DESCRIPTION 1
■Microphone (HM-103)
➊
➌
LOCK
DNUP
OFF
ON
➋
➊UP/DOWN SWITCHES [UP]/[DN] | ➋LOCK SWITCH [LOCK] |
Change the operating frequency. | Locks the [UP]/[DN] switches. |
• Push and hold to change the frequency continuously. | ➌PTT SWITCH [PTT] |
• Tuning step is 50 Hz when no TS indicator appears. | |
| Push and hold to transmit; release to receive. |
TECHNICAL INFORMATION
• MICROPHONE CONNECTOR
+8 V DC output | Frequency up/down | AF output | PTT | GND (microphone ground) | Microphone input | GND | Squelch switch |
➀ | ➁ | ➂ | ➃ | ➄ | ➅ | ➆ | ➇ |
Rear panel view 1 2345678
PIN NO. | FUNCTION | DESCRIPTION | ||
1 | +8 V DC output | Max. 10 mA | ||
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2 | Frequency up | Ground | ||
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Frequency down | Ground through 470 Ω | |||
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8 | Squelch open | “LOW” level | ||
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Squelch closed | “HIGH” level | |||
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| Caution: DO NOT short pin 1 to ground as | ||
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| this can damage the internal 8 V regulator. | ||
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• HM-103 SCHEMATIC DIAGRAM
MICROPHONE 2k | MICROPHONE PLUG | |
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| MICROPHONE |
10∝ + | 4700p | CABLE |
MIC | 0.33∝ + |
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ELEMENT |
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| 4700p | 1 2345678 |
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| 2.2k |
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| DOWN UP |
PTT | RECEIVE | 470 |
| TRANSMIT |
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8
