![What is software-defined radio (SDR)?: The basics for critical communications users - Barrett Communications What is software-defined radio (SDR)?: The basics for critical communications users - Barrett Communications](https://www.barrettcommunications.com.au/wp-content/uploads/2019/04/SDR-2019.png)
What is software-defined radio (SDR)?: The basics for critical communications users - Barrett Communications
![Amazon.com: HYS TC-507 VHF Marine Transceiver 25 Watt Fixed Mount Marine VHF Radio Explorer, Optional Remote,Basic, Compact, Ocean Communication Tool,Marine Two Way Radio : Electronics Amazon.com: HYS TC-507 VHF Marine Transceiver 25 Watt Fixed Mount Marine VHF Radio Explorer, Optional Remote,Basic, Compact, Ocean Communication Tool,Marine Two Way Radio : Electronics](https://m.media-amazon.com/images/I/51gdzcTB3OL.jpg)
Amazon.com: HYS TC-507 VHF Marine Transceiver 25 Watt Fixed Mount Marine VHF Radio Explorer, Optional Remote,Basic, Compact, Ocean Communication Tool,Marine Two Way Radio : Electronics
![Amazon.com: Uniden Atlantis 155 Handheld Two-Way VHF Marine Radio, All USA/International/Canadian Marine Channels, NOAA Weather Alert, 10 Hour Battery & Shoreline Marine Basic Safety Whistle with Lanyard : Electronics Amazon.com: Uniden Atlantis 155 Handheld Two-Way VHF Marine Radio, All USA/International/Canadian Marine Channels, NOAA Weather Alert, 10 Hour Battery & Shoreline Marine Basic Safety Whistle with Lanyard : Electronics](https://m.media-amazon.com/images/I/41K1JsxHw3S._AC_.jpg)