‰ NOW 20 WPM ‰ TEXT IS FROM MAY 2015 QST PAGE 41 ‰ SPECTRAPLUS PROFESSIONAL EDITION, VERSION 5R0 SOFTWARE FROM PIONEER HILL SOFTWARE. THE SOFTWARE ALLOWS POSTPROCESSING ANALYSIS IN THE TIME DOMAIN, FREQUENCY DOMAIN, AND VARIANTS OF THE FREQUENCY DOMAIN PROCESSING. THE SPECTRA SOFTWARE PROVIDES VERY ACCURATE TIMING CURSORS TO DETERMINE TIMES BETWEEN EVENTS AND EVENT OCCURRENCE TIMES. MY RECORDED DATA WAS DIGITIZED TO 16 BITS. SPECTRA USED A 4096 POINT FFT TO PRODUCE THE RESULTS SHOWN IN THE SPECTROGRAM. THE DATA OVERLAP WAS 90. THE TIME RESOLUTION WAS 8R63 MS, AND EACH PIXEL IS APPROXIMATELY 12 HZ WIDE IN FREQUENCY. STARTING AT THE FAR LEFT OF FIGURE 2, THE FIRST EVENT IS THE 60R9 MS DIT TRANSMISSION PERIOD. SINCE THE RECEIVER IS OFF, AMPLITUDE IS DEPICTED IN DARK BLUE. MOVING TO THE RIGHT, THE RECEIVER IS SWITCHED BACK ON, AND A FIELD OF GREEN ‰ END OF 20 WPM TEXT ‰ QST DE W1AW ƒ