‰  NOW 20 WPM  ‰  TEXT IS FROM SEPTEMBER 2015 QST  PAGE 44 ‰

TONE OR A 600 HZ TONE DEPENDING ON THE MINUTE OF THE HOUR.  THE APPLICATION
RUNNING ON THE COMPUTER IN CONJUNCTION WITH THE SOUND CARD SHOULD DISPLAY
THE DECODED AUDIO AS A LINE IN THE WATERFALL SEE THE YELLOW LINES IN
FIGURES 1 AND 2.  CLICK ON THE WATERFALL LINE AND NOTE THE NUMERICAL
FREQUENCY VALUE DECODED BY THE SOFTWARE.  THE NUMERICAL VALUE 500 IN FIGURE
1 SHOWN IN A SMALL BOX BELOW THE WATERFALL TRACE SHOULD READ 500 OR 600 HZ,
DEPENDING ON THE MINUTE, IF THE SOUND CARD CALIBRATION IS ACCURATE.  SOUND
CARD FREQUENCY ERRORS ANY DEVIATION FROM THE EXACT FREQUENCY OF 500 HZ OR
600 HZ WHILE RECEIVING IN THE AM MODE WOULD INDICATE THAT THE SOUND CARD
CALIBRATION IS NOT CORRECT.  BEFORE PROCEEDING FURTHER, YOU SHOULD REFER TO
THE SPECIFIC SOUND CARD DOCUMENTATION FOR THE CALIBRATION AND COMPENSATION
‰  END OF 20 WPM TEXT  ‰  QST DE W1AW  ƒ