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Old 02-02-2012, 12:07   #1
drmdab
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UNID DRM on 3480, 4450, 4557, 6600 kHz in Asia

Hi all,

Japanese DXer Sei-ichi Hasegawa reports about UNID (test) transmissions in Asia on DXLD Yahoo Group:

Quote:
I received powerful DRM signal on 4557kHz at 2200UT (tune in) on Feb.1. There is not the announcement in Non-stop music. s/off at 0400 on Feb.2. http://www.mediacat-blog.jp/usr/drm/...20201_2345.gif

This frequency is Clan. st. from S.Korea "Voice of the People-Inmin e Sori Pansong" uses it.
de Hiroshi
S.Hasegawa

Quote:
Audio File: http://web.ndxc.org/aoki/dc/tx7_3985...-0217_4557.mp3 by
Hiroshi at 0217UT on Feb.2.

Quote:
Acc. to Japanese DXer XYZ in Akita.

"I received UnID DRM signal on 3480kHz at 0740 tunein to 0754s/off and 0840 on 4450kHz on May 26 2011."

http://ani.atz.jp/FBDX/DRMBBS/img/147.gif by XYZ on 3480kHz
http://ani.atz.jp/FBDX/DRMBBS/img/147.gif by XYZ on 4450kHz

Voice of the People performs AM broadcasting on 4450kHz now.
S.Hasegawa

Please see also his screenshots for more information.
I don't believe these transmissions have something in common with the clandestine station from South Korea but it seems like a TX in Asia is testing.

I don't know if 3985 kHz was also on the air as mentioned in the lable in the first screenshot.
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Last edited by drmdab : 17-03-2012 at 17:14.
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Old 06-02-2012, 23:40   #2
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Confirmed! 4557 is now on air with pop (?) music, but relatively difficult to decode at my Japanese QTH. Time: 0037 UTC. Log follows later.
PS: 3985 is not on air at the time of writing.

The log wasn't very impressive, but tomorrow I'll try earlier in the morning here in Japan.
Attached Images
File Type: png 4557-120207-0035-0110-HED362@JP.png (38.9 KB, 275 views)
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Last edited by Digger : 07-02-2012 at 00:19.
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Old 08-02-2012, 00:26   #3
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Silly enough, I programmed the wrong frequency, so I probably missed some (or much) of the transmission in the morning. They run Mode B / 9 kHz and 400 ms (short interleaving) and protection level 1/0. Just before I started the log the SNR was high, and in the beginning I logged >22 dB, which is a lot for the receiver I use here. The programme consists of pop music in English, but the same tunes are repeated - I heard the same title within 40 minutes. The channel impulse was not very distinctive. If one of the pulses is less than 10 dB over the others the audio gets chopped up and with the increasing daylight the signal gets weaker.
Attached Images
File Type: png 4557-120207-2326-0110-HED362@JP.png (46.8 KB, 261 views)
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Old 09-02-2012, 03:15   #4
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If you enter 4557 kHz in http://www.short-wave.info/index.php you'll find a transmission from DPRK. My Korean knowledge is not much worth, but around 2301 UTC some information was given (at least it sounded to me like it came from the North) in the AM transmission including a list of frequencies, then the AM carrier was on for a minute or so before they shut down the TX. After a short burst (a second or so) of DRM there was silence for 45 seconds and then the DRM started. It is the same music over and over and there are no announcements. This morning the reception was very poor. What "3985" in the label stands for is not clear.
Attached Images
File Type: png 4557-120208-2306-0015-HED362@JP.png (44.3 KB, 249 views)
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Old 09-02-2012, 22:30   #5
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The AM signal is readable here for several evening hours.
Must be North Korea, heard the names Kim Yong Il and Un many times.
Unfortunately DRM starts when the propagation conditions are more or less over here.
I was lucky tonight, DRM detection for some minutes.
Attached Images
File Type: png 4557_120209_2304_DK6QI.png (24.5 KB, 286 views)
File Type: png 4557_120209_2306_DK6QI.png (22.0 KB, 262 views)
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Old 10-02-2012, 00:11   #6
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@Fritz: Congratulations for good DX on 4 MHz!

10th Feb. 2012

22:58:00 UTC: (Kim Jong Il) x 9999
22:59:00 UTC: Vocal music (In AM)
23:00:00 UTC: Fanfare music and an announcement in Korean
23:00:40 UTC: Announcing frequencies .... kHz...
23:01:15 UTC: More military fanfare music
23:01:30 UTC: End music
23:01:31 UTC: RF carrier only (Dream: IF = 11770 Hz)
23:03:13 UTC: AM TX off
23:03:25 UTC: One second of DRM carrier
23:04:07 UTC: DRM start (Dream: IF = 11755 Hz)

Unfortunately, the carrier is getting weaker day by day here. The first track was "I'm Still Standing" (Elton John?). My log was not very impressive. At least nobody switched on the Plasma TV.
Attached Images
File Type: png 4557-120209-2304-0028-HED362@JP.png (45.5 KB, 245 views)
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Last edited by Digger : 10-02-2012 at 22:37.
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Old 10-02-2012, 22:50   #7
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Same pattern this morning with the AM signing off and the carrier sitting for a while and the DRM that begins 4 minutes into the hour.
The signal here was even weaker than yesterday.
Attached Images
File Type: png 4557-120210-2304-2339-HED362@JP.png (42.8 KB, 231 views)
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Old 12-02-2012, 12:17   #8
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This morning I logged one hour with 58.5% CDA. Then we left for a drive and the second log is the result for the whole session.
Attached Images
File Type: png 4557-120211-2304-0000-HED362@JP.png (44.2 KB, 219 views)
File Type: png 4557-120211-2304-0400-HED362@JP.png (47.8 KB, 221 views)
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Old 12-02-2012, 13:16   #9
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Digger, thanks for your interesting analysis. I am wondering if the AM station you heard is really a DPRK broadcast or from the South. I just noticed that "Voice of the People" was heard yesterday at 2217 UTC on this frequency by some Austrian DXers (reports in A-DX mailing list). This was possible because the DPRK jamming was missing.

I do not belive (at this point of time ) that DPRK has DRM transmittors but would assume South Korea could have bought some. As the DRM and AM transmissions seem to come from the same site (?) this would be a possible explanation. DRM from North Korea with western pop music seems unthinkable.
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Old 12-02-2012, 16:23   #10
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Quote:
Originally Posted by drmdab
I am wondering if the AM station you heard is really a DPRK broadcast or from the South.
I think the AM station on 4557 kHz is from the north.
Never heard the names Kim Jong Il and Un that often in any newscast.
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Old 12-02-2012, 16:26   #11
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"Voice of the People" should also be on 3912, 6518, 6600 kHz in AM (but with DPRK jamming).
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Old 12-02-2012, 17:09   #12
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On 4450 kHz I receive a korean speaking AM station that is obviously heavily jammed.
On 3480 kHz there is also korean AM, obviously not jammed.
4557 kHz is also very clear without problems in AM.
Attached Files
File Type: zip 4450_120209_2050_DK6QI.mp3.zip (89.0 KB, 226 views)
File Type: zip 4557_120209_2115_DK6QI.mp3.zip (99.5 KB, 205 views)
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Last edited by FritzWue : 12-02-2012 at 17:17.
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Old 12-02-2012, 18:41   #13
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Hi Fritz, all I can hear on 4557 kHz right now is some bubbling noise which I presume to be the DPRK jammer. Seems like it is back now?!

Edit: ...and now the noise is gone again... strange
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Last edited by drmdab : 12-02-2012 at 19:01.
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Old 12-02-2012, 23:13   #14
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Hi drmdab, Fritz and all,

In Japan, as rule of thumb, if you hear a Korean speaking station on short wave, it is a DPRK transmitter. If you hear a jammer with some kind of Korean content (such as i.e. Voice of the People), the jammer is from DPRK and the programme you can't hear is from South Korea.

The sweet talk from DPRK on 4557 kHz before 23 UTC is all about the wonderful leaders Kim. This morning the Dream IF frequency was 11819 Hz when the AM carrier was left on just after 2300 UTC, and the DRM IF was 11820 Hz, so I believe that it is the same transmitter for the AM and the DRM.

They found another CD this (Japanese) morning - it sounds to me like it is a collection of cover versions of American (?) pop music, or it is something I have never heard before. Later there was another CD that sounded more like the "real thing".

If the DRM TX would be a South Korean one, why would the DPRK switch off their transmitter only to let their arch enemies in the South on the air? Seems impossible to me, as I mentioned in the beginning. After all, when the DRM ends, the AM from DPRK starts again.

And, there are no text messages, it just says "English" and the ID is 8299. Well, the origin remains a mystery (to me).

A quite good link for Short Wave frequencies is:
http://www.short-wave.info/index.php

If you'd like to use the Google Translator, here is a Japanese web site for DRM:
http://drm.mediacat-blog.jp/

Later, at 0404 UTC (1304 JST) the DRM went QRT. The frequency remained silent after this. At the time of writing (0415 UTC) I can hear Nikkei Hoso from Japan on 3.925 and 3.945 MHz and there is a carrier on 5.005 MHz, otherwise the band is empty.

My logs for today: The first hour with 78.3% decoded audio and the whole log with 21% decoded audio.

73s from a cold Japan (outside and inside)


EDIT 0505 UTC: It seems to me that both 4450 and 4557 kHz are transmitting the same AM content just now. However, the AM modulation is very weak.
Attached Images
File Type: png 4557-120212-2304-0000-HED362@JP.png (44.8 KB, 233 views)
File Type: png 4557-120212-2304-0404-HED362@JP.png (48.6 KB, 259 views)
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Last edited by Digger : 13-02-2012 at 04:10.
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Old 13-02-2012, 12:52   #15
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3480, 4450, 4557 kHz are transmitting the same stuff now at 1348 UTC. 4450 is drenched by a co-channel QRM:er.
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