The audio transformers shown above have center-taps on both the primary and secondary windings. All wires are color coded for easy signal routing. Also a very popular TNC interface connector to PacComm, MFJ, and AEA TNC, radio ports. This is the cable for your TNC to Radio interface, or when interfacing the PSK31 or SSTV sound card to transceiver. The cable is 3 feet long, and has a 5 pin DIN connector already installed on one end.
All wires are color coded for easy signal routing.
Other radios have similar ports. Ideal for interfacing Packet TNCees or PSK31 and SSTV to PC Sound Cards. LabTec C-324 Stereo headphone with boom microphone for accurate voice input 8' shielded cord with 3.5mm gold stereo plug for headset and 3.5mm gold plug for microphone. Adjustable double headband and microphone arm for easy positioning. The 4N29 is used to isolate PSK31 and SSTV sound card from the transceiver PTT circuits to reduce RF feedback.