Strange sounds

Submitted by Elmar on Fri, 07/17/2009 - 16:30

The last couple of days the conditions were quite nice on both 20m en 10m. Last night I heard some VK's and ZL's on 20 meter and this morning the first KH6's.

I made some nice QSO's on 10 meter the last couple of evenings. Today was the first day that the band was also open during the day. There was quite some slow QSB at some moments but I worked some new DXCC entities on 10 meter. I made nice Q's with F5IHP, I3CGV, G4HZW, EA4EUI, F/PH1MRF, F6IRG, UR5KDX and some more.

During the QSO with Bert F5IHP a strange sound was coming up on the band this morning. Bert thought it was some local QRM/QRN but I heard the same sound moving over the 10 meter band. So nothing local but it could be heard across Europe.

A little later (around 8:45 UTC) I made a recording of that sound with my webcam. When you strart the video on the left you can hear it and see it moving up the band. A little later I heard the same thing again starting at around 28.490.

If you have any idea what this is, please leave a comment.

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Yes, the same sound !!

Submitted by Anonymous on Sun, 06/27/2010 - 15:06.

Hi,
I've found thoses lines during a random internet search on my callsign.
Great idea to take the time to make thoses movies!

The answer is yes, exactly the same sound
So the question is still waiting for an answer!

Bert F5IHP

Strange noise

Submitted by Anonymous on Sat, 05/01/2010 - 21:05.

Hi PD3EM,

Are you sure that noise is not coming from a switch mode power supply somewhere in your shack?

Gordon de VK4FO.

No switched power supply

Submitted by Elmar on Sat, 05/01/2010 - 21:15.

Hi Gordon,

Luckily I don't have any switched PSU in my shack.
The sounds was heard in France at the same time, so no local QRM.
As far as I know now, the strange sounds can come from a geo-magnetic storm.

73, Elmar PD3EM