I was reviewing my 5 hours worth of recording of 670 kHz  from the
other night when the Chicago station went silent for a while, and
found some strange 875 Hz pips at about 0200 MST.

Anybody know what this might have been?

Spectrogram: http://mesamike.org/radio/mwdx/pics/UNID_PIPS-670-20120310_0200.PNG
Audio: http://mesamike.org/radio/mwdx/audio/Unid/UNID_PIPS-670-20120310_0200.mp3

-- 
Mike Westfall, Los Alamos, NM
http://www.facebook.com/mesamike
My MWDX stuff: http://mesamike.org/radio/mwdx
Online logbooks: http://dxlogbook.gentoo.net
Reception Report & QSL Manager for KRSN
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