Tags
- Amateur radio
- APRS
- Bell System
- Bit rate
- Caller ID
- Controller
- Data signaling rate
- Duplex
- Frequency-shift keying
- High frequency
- Modem
- North America
- Packet radio
- Plain old telephone service
- Process manufacturing
- Production control
- Public switched telephone network
- Radio
- The Universal
- TX
- Universal
- Universal Radio
- Very high frequency