This page decribes the functions of the controls on the SEM-25 control box.
| Ref. | Description |
|---|---|
| A | Channel programming drum (behind cover) |
| B | Call button: Keys transmitter, sends 1600 Hz tone |
| C | Squelch |
| D | Volume |
| E | Manual tuning, 1 MHz steps |
| F | Manual tuning, 50 kHz steps |
| G | Power |
| H | Channel selector (H = manual tuning) |
| I | Power-on light (turn bezel to dim) |
| AUS: | Off |
|---|---|
| EMPF: | Receive-only |
| SENDEN KLEIN: | Transmit/receive (low power) |
| SENDEN GROSS: | Transmit/receive (high power) |
Note: Squelch is opened by carrier level, equivalent to "old" mode in U.S. radios.
| RAUSCHSP. AUS: | Squelch off |
|---|---|
| RAUSCHSP. EIN: | Squelch on |
| RELAIS: | Relay (retransmit) |
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