Mystery 10k wide digital mode on 3.950USB

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  • Updated 3 years ago
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went on continuously for at least 30 minutes. could be longer but i had things to do. looked and sounded like easypal, except it was a full 10k wide and well defined.

Its a mystery!
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Lee Maisel

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Posted 3 years ago

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Ken - NM9P

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It looks like it could be a DRM shortwave broadcast signal.  I have heard one reported on the high end of 80 before.

Ken - NM9P
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Steve Yothment

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Official Response

Yes, that's Digital Radio Mondiale.  Check the schedule here:  http://www.hfcc.org/drm/

BBC World Service is on DRM on 3955 kHz at 0500Z to 0600Z.

- Steve  W4OGM

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Lee Maisel

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Hmmm I thought that too but could not decode at all.
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Lee Maisel

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I am using DREAM  maybe I have the flex 6500 setup wrong?
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Ken - NM9P

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The last time I tried to use DReaM I couldn't get anything to decode.  Apparently I need to compile an AAC Codec.  After trying unsuccessfully to find one online, or an easy way to make one, I lost interest and went on to other pursuits.  

Apparently there are others who have had more luck and are enjoying DRM.  I would like to hear from them.  It seems like a good project for the Flex.  

Ken - NM9P
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Steve Yothment

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I receive DRM with my Flex-3000.  I use the DRM Software from VT Merlin Communications and the decoding works OK, but the SNR has to be 15dB or more for a decent decode.  The signal on 3955 kHz shown in the picture above is too weak to decode. 

The downside of receiving DRM is that you have to pay a license fee to decode it, but once you do that you are ready to go.