MFJ 1275MX is a sound card interface designed for use in sound card to radio applications. It minimizes hum, noise, and distortion, ensuring the best possible signal from your equipment.

Special features of the MFJ 1275MX include:

• Serial port: allows the computer to control the push-to-talk of your radio and the microphone push-to-talk switch to override and/or interrupt your computer’s transmission.

• Microphone/Radio plug-in jumpers: internal jumpers program microphone wiring for any brand or model of radio with the appropriate 8-pin connector.

• PTT Message Interrupt/Stop: Microphone PTT (push-to-talk) switch automatically halts outgoing messages when using software that allows external com-port interrupts.