To hear an unfiltered Cloudbounce
signal click Here

Signals are at 488 Hz and 976 Hz.
All other signals are harmonics
of sodium lights in the city, including 120 Hz.

This signal was received over a 4 mile NON-LOS path.
The cloud ceiling was 10,000 feet with an optical path
of just over 5 miles.

Using Cool Edit will filter out unwanted noise
and clarify the signal.

To hear the filtered version click Here