DAIR FSK modules Allow DAIR FSK information to be recorded on the cannel 5 section of the magnetic tape by converting DAIR FSK square waves to a biphase signal. a. Record converter-converts incoming DAIR FSK signal to biphase signal to be recorded on tape. b. Reproduce converter-converts the recorded biphase signal back to FSK format for display on DAIR indicators. c. Power supply-provides DC voltages for digital circuitry.