selective call
with audio | frequency coding
| selective call | |
| commun. railw. од. | 选呼 |
| frequency coding | |
| mil., air.def. | 频率编码 |
| |||
| ★ 选呼 | |||
| 选择呼号 | |||
|
selective call : 15 phrases in 6 subjects |
| Aviation | 1 |
| Communications | 4 |
| Electronics | 1 |
| Space | 1 |
| Technology | 5 |
| Telecommunications | 3 |