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Old 14-10-2018, 20:26   #1
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G4TMV's Avatar
Join Date: Feb 2015
Location: East Lancashire, north west England
Posts: 219
Mystery DRM Signal on 3260 kHz

Hi All,

Jordan Heyburn in Northern Ireland reported the following signal on the World of Radio mailing list, and I can hear it here as well, though not strong enough for a lock as yet. Someone on the list suggested that North Korea may be a suspect as they were supposed to have tested this mode. Maybe some of you will have more luck with getting an ID and can give Jordan an answer?

Jordan's original post:

"I am copying a DRM transmission on 3260kHz however it's too weak to get a lock. Any ideas?

0150 UTC Perseus SDR - Beverage (Japan wire) - Remote QTH Finland

On the other wires (SEA & Southern) the DRM signal is dramatically decreased.

Best Regards,

Jordan Heyburn"

Modified NRD-525G with
Radiokit DRM Decoder Board,
SDRplay RSP-1A,
Airspy HF+ Discovery
SDR Console v3

Lancashire, UK
53:39.18N 02:10.28W

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Old 15-10-2018, 04:15   #2
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Join Date: Aug 2006
Location: BaiSe, P.R. China @E10636′ N2355′
Posts: 246
Got it via KiwiSDR.

Unstable signal with wildly variable field strength. It seems generated from a good quality Tx station. I have the suspicion the encoded bit stream is purposely scrambled to prevent outsider from deciphering it (That is why DreaM can NOT display any useful/meaningful Info.). Also the center DC freq is quite odd (3262Khz).
Attached Images
File Type: gif 3262kHz.GIF (88.7 KB, 122 views)
Any kind of audio drop-out is worse than any kind of low quality audio: No audio, No log report.

My Rx location: GuangXi Province @ E10636′ N2355′
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Old 15-10-2018, 07:14   #3
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Join Date: Mar 2010
Location: Northeast France
Posts: 389

I have this signal S9 of my S/Meters and SNR 7 to 9 db.

This signal and the mention CELT in the audio Codec remind me the same signal as on 4770 kHz with DRM A service!!!!! I think that it is the same station.


Mixer Platine MF9 Mhz with Dream

Mantova Turbo 5/8 wave for 27 mhz
Long Wire 80 meter
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