In an amateur digital radio system, which device is typically connected to the computer?

In an amateur digital radio system, the modem is the device that is typically connected to the computer. The modem serves as the interface between the digital signals from the computer and the analog radio signals that are transmitted and received. It converts the digital data from the computer into audio tones that can be sent over the airwaves, and vice versa, it converts incoming audio signals back into digital data for the computer.

This connection is essential for digital modes of operation, where data needs to be transmitted and received in a format that the computer can process, allowing operators to send and receive text, images, or other data forms using their amateur radio equipment. The modem facilitates this process, enabling communications that require the accurate transmission of digital information across radio frequencies.

Other devices like the transmitter and receiver are critical in the operation of a radio system, but their role is separate from the direct connection to a computer for digital communications. The antenna, while essential for transmitting and receiving radio signals, does not handle the digital data conversion process.