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Old 26-03-2008, 20:37   #1
Brendan1
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Question Unidentified DRM on 6200kHz 0500UTC

Greetings everyone!

I have recently found an undocumented DRM broadcast on 6200kHz during the 0500 to 0600 UTC timeframe, exact time and duration unknown.

It appears to not be from Europe, as it shows no polar path characteristics, just the usual multipath distortion. The signal is quite weak here, and I am unable to get a lock on the SDC data for ID. BBCWS Kvitsoy on 6195 is slightly stronger here, and it overlaps by 5kHz, not helping our chances for identifying it.

I am located on the west coast of the US, in Bellingham, Washington, just south of the Canadian border.

If anyone can help track this mystery station down, I would greatly appreciate it. I am wondering if this isn't a PRC test in preparation for the Olympics, as propagation to Asia is opening at that time of day (my late evening), and an ID would clear up this mystery.

Thanks!
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Old 27-03-2008, 00:56   #2
fibber
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Xizang, China?

Listed in WRTH and Passport at 100kW in Tibetan (analogue) for that time frame.
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Old 27-03-2008, 02:16   #3
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Hi Fib!

Yeah, I found Xizang PRC as well, but I doubt that the People's Republic is broadcasting to Tibet in DRM. It is an honest-to-God DRM signal, 10kHz wide, and not hard to tell from analog, which is what makes the mystery even bigger for me. Unless they've turned the pattern towards the rest of the country, I just can't reconcile the Xizang broadcast with what I'm hearing.
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Old 27-03-2008, 10:18   #4
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I heared that WYFR currently converts a transmitter in Florida to DRM. Maybe thats a test transmissison from there??? (Hmm, 6200? would that be out of usa broadcast band? (is 49m allowed?))
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Old 27-03-2008, 10:23   #5
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Hi,
Hm, looking in _B07all00 I can't see anything listed on that QRG at that time. However, Sirjan is listed a little later on 6200 kHz - they are playing around in DRM on 9.480 MHz, usually starting around 06:30 UTC. But with the weak signal they produce here over 4500 km it would be a small wonder if they get all around to WA. By the way, there was nothing this morning on 9.480 MHz, just a carrier for a short time after 06:35 UTC. I'll try to monitor tomorrow. if I wake up
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Old 27-03-2008, 10:37   #6
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No sign of any DRM on 6200 here in NZ this evening - just Kvitsoy on 6195.

If the mystery signal was on today it wasn't propagating to this part of the world.

Cheers, Chris
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Old 27-03-2008, 13:11   #7
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@Maxpower: yes, 49 meters is allowed here but 6200 is not legal as it is the band edge, so it can't be WYFR. I didn't see the signal last night as my noise floor was quite high for some reason. Another DRM NA listener 40 miles west of me saw it, but couldn't ID it either.
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Old 27-03-2008, 16:16   #8
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Further results from NA listeners last night: two confirmations on the west coast (no decode), one from the middle US who received "AAC EEP Mono" before it dropped out of decode. He had it from 0540UTC to an abrupt close at 0555UTC.

Propagation last night had me receiving the Japanese "Slot Machine" on 6445 (Japanese Navy encrypted channel) in the same hour, although it was weak. This morning (1600UTC) I can receive PRC jammers and even an extremely weak analog carrier on 6200 - which is probably Xizang. So, at my latitude (49 degrees North) I am able to hear 6 MHz signals at that hour, although they tend to be weak, which leads me towards an Asian origin. But, as our midwest listener put forth, what if it's a pirate?

I'll keep listening.
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Old 28-03-2008, 06:11   #9
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The broadcast was definitively ID'ed as RNW Bonaire tonight by several US listeners. It is coming across as an inverted signal as well, and would appear to be a bad filter on the transmitter output.

One listener positively decoded the same program material as that running on Bonaire 6130 with the same SDC data as well, so it is neither a pirate or otherwise unknown broadcast.
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Airspy HF+ Discovery + SDR-Console s/w + 60m dipole
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Old 28-03-2008, 10:36   #10
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Drat!!! How boringly mundane

73 Chris
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Old 28-03-2008, 13:21   #11
Brendan1
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I agree, it's a bit of a letdown to find out it's just a transmitter problem. I was hoping for a pirate station actually...
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