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June 29, 2015 FT221 to PC Interface

Interfacing my Yeasu FT221 Radio to my OpenBSD computer allowed me to work on my OpenBSD APRS client. It is nice to work for large engineering companies with access to the latest tools and parts. For personal projects we use whats available in the junk box or what we can afford.

The audio transformer used for this project is based on two unshielded inductors taken from an old telephone filter. The inductors are placed in close proximity allow for the coupling the primary and secondary turns.