Actual HFDL data burst trace from the sample included below. Monitored
on 11.387 mHz on 26 Dec 2011, it can be heard HERE. The upper trace shows
the stable phasing tone followed by the beginning of the message as seen on
Vertin Technologies dowloadable oscillosope. Trace below shows the same burst
on Vertin's Spectrum Analyzer, clearly showing the concentration of demodulated
audio energy in the phasing portion as trepresented by the spike on the left, with
the more disbursed energy of the message trailing off to the right over time.Full
detail available by clicking on trace photo.
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