50MHz kHz hertz Hz kilohertz piQund4 MHz baud 59Qp94 S42 oscillator 2Qp625 S41 fQunds VFO Gbit waveplan cycloconverter khz fQund0 WMKX Mbit 2Qp4GHz AFSK GQp729Qp1 802Qp11a keying speed 11785 802Qp15Qp3 20kHz modulation