Topband: beeping signals

[Thomas Damboldt]

Hi,

On the low end (1800 - 1820) of topband I can hear strange signals transmitted as two beeps following each other immediately, sounding like second beeps, but there are only 56 beeps in a minute. These signals are apparently transmitted synchronously separated by about 822 Hz with the maximum around 1812 kHz. They are only audible in the evening and 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
22 September 2004



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