SETI public: Doppler?

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Here is a sort of SETI question that I have been wondering about.

In 2003 my wife and I were traveling around Newfoundland in our RV and we camped next to a light house for the night. At about 2 AM the fog rolled in and the light's fog horn came on (damn their loud). I listened to it for a while and noticed that the initial note of the horn was echoed by a note slightly higher in frequency. I don't have much of an idea why the echo should be higher.
If you would like to hear the horn click on the lighthouse picture at:
http://www.seti.net/family/Motor%20Home%20Trips/Keep%20On%20Trekin/New_Beginning/Newfoundland/Western%20Region/Codroy/codroy.htm
Its about 6 meg AVI file and a set of earphones helps to hear the echo.

Any ideas about this???

Regards..... Jim

Argus Station: DM12jb
James Brown
W6KYP
Jim_at_SETI.Net [put 'SETI' in subject line]
www.seti.net

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