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.
• Tuning step is 50 Hz when no TS indicator appears. | ➌PTT SWITCH [PTT] |
| Push and hold to transmit; release to receive. |
![➊UP/DOWN SWITCHES [UP]/[DN]](/images/new-backgrounds/53751/5375121xi2.webp){kind=small}
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 |
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MIC |
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| 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 |
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| 470 |
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| TRANSMIT |
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