Preview sounds here:

https://soundcloud.com/user-665009105/morse-code-and-radio-chatter-modular-sound-library

List of message building-blocks from which radio conversations are assembled:

https://docs.google.com/document/d/1LkkRk7w66d79UXnqFXXAxJb0u8bLmqyHv6daY4FfTNY/edit?usp=sharing