ARLA/CLUSTER: Ruídos estranhos nas Ondas Curtas

[João Costa > CT1FBF]

More strange shortwave noises..

Tune around 28.6 MHz most mornings and you will hear a train of two tones,
one low and the other high audio (600Hz, 1500 Hz ?) lasting a few seconds
each and with a pause of about two seconds between them.

They sound like square wave modulation but there's no carrier. Last for
hours at any time. Also hear at times a MHz or two lower.

Just what are they and from where ?
Get the beams on them !!

*Des Walsh, EI5CD*
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