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FLDIGI Soundcard Calibration
Wwv mode George Blakeslee N1GB
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Launch FLdigi
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Select the WWV modem - Op Mode > WWV
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Select the Digiscope - View > Floating Scope
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Open Configure > Audio
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Choose Devices tab Check Port Audio
Select Input & Output soundcards drop down menu
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Choose Settings tab Set Sample Rate: Input & Output to Native
Set Converter: Best Sync interpolator Will be adjusting the "Rx corr Rate" while observing the slope of the time tick line.
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Tune in WWV or WWVH 2.5, 5.0, 10.0 or 15.0 MHz
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Observe slope of line POSITIVE NEGATIVE
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If positive - ADD NEGATIVE value in RX ppm
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If negative - ADD POSITIVE value in RX ppm
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Repeat until Time Tick is vertical along guide line
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Left-click on Time Tick line in Digiscope to center it
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Right-click in Digiscope window to zoom 5X
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