topband: beacons?

[Thomas Damboldt by way of Bill Tippett <btippett at alum.mit.edu>]

Dear Lowfers,

On the low end (1800 - 1820) of topband I can hear lots of strange 
(beacon?) signals about 822 Hz apart with the maximum around 1812 kHz. They 
are only audible at night, so probably real propagating HF signals and not 
coming from the power line.  Does anybody know what they are?

73, DX and cuagn
Thomas, DJ5DT
09 May 2004