Which device would be connected between a transceiver and computer in a packet radio station?

In a packet radio station setup, a terminal node controller (TNC) serves as the critical interface between the transceiver and the computer. Its primary function is to convert digital data from the computer into audio tones that the transceiver can transmit and, conversely, to convert the audio tones received from the transceiver back into digital data for the computer.

Packet radio relies on digital communication, where data packets are sent over radio frequencies. The TNC not only performs the modulation and demodulation of the signals but also handles protocols that ensure data integrity and delivery, making it essential for effective communication in packet radio systems.

Other devices mentioned serve different roles. A transmatch is typically used to match the impedance between the transceiver and the antenna but does not facilitate data communication. A mixer is involved in combining or modifying signals in radio applications but is not specific to digital data transmission like a TNC. An antenna is necessary for sending and receiving signals but does not process data; it merely transmits the modulated signals generated by the transceiver. Thus, the terminal node controller is the correct answer for connecting the transceiver and the computer in this context.