[A-DX] UNIDentified in DRM

Wolfgang Bueschel
Do Mai 23 21:25:42 CEST 2013

Danke Christoph,

siehe neues TopNews, dort ist alles breit erklärt.
vy73 wolfgang

btw. bin die nächsten 4 Tage mal aushäusig wieder zum BBT-Kontest im Schnee,
1850 m asl.

Diese DRM Tests von 2 Standorten Richtung Hauptstadt Moskau und nordisches
Gebiet dahinter in Russland hat bisher im deutschen Raum kaum Beachtung
gefunden, oder ist eher nicht publik geworden. Die Franzosen und Schweden
wussten da eher besser Bescheid.

RUSSIA   7370drm mode.  UNIDentified in DRM. UNIDentified station in DRM
om May 23, at 0630 UT on 7370 kHz.
(Ivo Ivanov-BUL, wwdxc BC-DX TopNews May 23)

UNIDentified in DRM mode.
Thanks to screenshot snap taken by Sandro Blatter in Switzerland.

7370  Unidentified tx location, of DRM mode outlet Radio Mayak
identification on Russian Federation, on May 23 at 0637 UT.  ID:1001

btw. ID:1001
seems to be a standard delivery ID label of TransRadio Berlin DRM encoder,
appeared also in 2009 and 2010 year on Romanian Tiganesti DRM gear outlet.

Super strong 10 kHz wide frequency block ONLY seen
in Finland remote Perseus units and on
DF3LZ SDR Perseus unit in Hamburg Germany, S=9+15dB signal.

NOTHING seen in Australia, Japan, USA, and fairly nothing in England,
nothing in western and southern Europe so far.

Sugestion seems Krasnodar Armavir tx center outlet  ?
vy73 de wolfy df5sx  (wwdxc BC-DX TopNews May 23)

Re: 7370 kHz UNIDentified in DRM mode.
Hello Wolfgang, we have not transmitted DRM programs of Radio Mayak on
7370 kHz on May 23 at 06:37 UTC. 7370 kHz isn't our frequency.
(Andrey Shaydurov-RUS, Taldom TX center, Moscow region, Russia; May 23)

Moscow DRM SFN Tests from Krasnodar Armavir Tbiliskaya and Kaliningrad

The test digital broadcasting on HF in Russia.

Moscow Technical University of Communications and Informatics (MTUCI)
under a contract with the Russian Television and Radio Broadcasting
Network (RTRS) is conducting a test of digital broadcasting in the format
of DRM on shortwave.

The webcast will be held on the following schedule:
- 0600 UTC 21 May - 22 May 0600 UTC - 9740 and 9820 kHz;
- May 23 0600 UTC - 0600 UTC 24 May - 7370 and 7430 kHz;
- 0600 UTC 28 May - 29 May 0600 UTC - 7370, 7430, 9740, 9820 kHz.

At the same time will be used only one frequency. Frequencies will only
switch on the hour. Schedule change will be formed quickly as interference
detection at the point of measurement.

Will use 2 transmitters:
1. Bolshakovo 15 kW, azimuth  40degr (for all frequencies);
2. Krasnodar, 30 kW, azimuth 347degr (for the range of 9 MHz),
   the azimuth 337degr (for the range of 7 MHz).

Every hour the transmitter number 1 will air the first 40 minutes, the
transmitter number 2 last 40 minutes past the hour. Thus, each time the
first 20 minutes past the hour in the air will only transmitter number
one, the second two hours 20 minutes, the transmitter in the synchronous
network, the last 20 minutes hours only transmitter number 2.
Synchronization point will be located not far from Moscow.

The purpose of this research is to determine the benefits of the network
(the percentage of the decoded audio from the transmitter number 1 and
number 2, separately and in the sharing of the network).

It is expected that these tests will also be accepted in the Nordic and
Baltic countries.

Payment card cover signals from both transmitters in the frequency of
9.7 MHz 1800 UTC can be seen here.

Oleg Varlamov, a leading researcher MTUCI

MTUCI - a leading research center for digital broadcasting to DRM in
Russia, which holds most of the work on broadcasting in HF, including 26
MHz, SW, NVIS and so on.

RTRS - funds most research on broadcasting in DRM in Russia.

(DXingRU, May 14)

Moscow Technical University of Communications and Informatics under
contract with the Russian TV & Radio Network (RTRN) will fulfill DRM SFN
tests on the HF.


Transmissions will be held from 06 UT 21 May to 06 UT on May 22 at the
frequencies of
9740 kHz (9820 kHz)
and from 06 UT on May 23 to 06 UT on May 24 at the frequencies
7370 kHz (7430 kHz).

Also from 06 UT on May 28 to 06 UT on May 29 at different frequencies
(9740, 9820, 7370, 7430 kHz).

Two transmitters will be used:

1 - Kaliningrad Bolshakovo, 15 kW, beam 040degr (9.7 MHz, 7.4 MHz);

2 - Krasnodar Armavir Tbiliskaya,  30 kW, beam 347degr (9.7 MHz)
    and beam 337degr (7.4 MHz).

Every hour the first transmitter will on the air in the first 40 minutes
and the second transmitter will on the air in the last 40 minutes.

Thus the first 20 minutes you can listen to the first transmitter, middle
20 minutes - both transmitters in SFN, and the last 20 minutes - the
second transmitter.

The purpose of the study - the detection of network gain (% of decoded
audio from the first TX, from the second TX and from the both TX).

Synchronization point will be near Moscow. Switching between the
frequencies in the same band will be operative to minimize interference
from other stations.

Transmission may also be heard in the Nordic and Baltic countries.
Please send reception reports.

(Oleg V. Varlamov  UA3ARI, from Moscow-RUS
<http://www.drmrx.org/forum/showthread.php?t=2493>   (drmrx May 14)

Im Lauftext wird auch eine E-Mailadresse fuer Empfangsberichte
RRReport address
<ops.trcefir @ gmail.com>  angegeben.
(Daniel Kaehler-D, A-DX May 23)

Does this means that Synchronization will be dynamically adjusted ?
What are the distances between the 3 points ? May 16.

On May 21 signal is here on 9740 kHz right on time peaking 30dB SNR.
(French operator F1BJB in JN19BL, May 16 / 21)

Synchronization point will be near Moscow.
>From each TX to RX about 1000 kms, and delay between TX is not necessary.
Another points with different propagation times (until 6 ms) may be OK.

[later]  May 21 - Thanks for long and informative report. It seems that
different propagation delay between TX make decoding impossible when booth
are on air. I try calculate it later.

On 23 May we plan to start at 06 UT on 7370 kHz until (preliminarily) 13
UT, then 7430 kHz until (preliminarily) 17 UT,then 7370 to 19 UT, 7430 to
20 UT, 7370 to 23 UT, 7430 to 24 UT, 7370 to 05 UT and 7430 to 06 UT.

We switched TX at 20 min and 40 min of each hour. Difference in
propagation delay may be near 5 ms (if one hop from Krasnodar) or near
6ms (if 2 hops from Krasnodar). It may be close to guard interval limit,
and TX work not at one, but as interference to each other. You graph is
seems to it. You location may be of the border of SFN area.
(Oleg V. Varlamov  UA3ARI, Moscow-RUS, drmrx May 16/21/23)

0720 hrs UTC Radio MAYAK of 9740 kHz good reception in Russian language
SNR 15 to 21 db, but little fading, very nice reception.
(Marcel in NoEaFrance, drmrx May 21)

The propagation today May 21 is not very good, so the result here in
Stockholm, Sweden is not very stable. Around 6 UT I could not see any
traces of a signal but after 0620 UT there was some sound to hear. My log
starts at 0630 UT and lasts for 279 minutes.

A 207 minutes long second log from 1242 UT. I removed the Doppler to get a
clearer picture. Hope that someone can make something out of these logs.

May 23 - Good reception during the first 40 minutes of the hour, then a
weaker signal during the last 20 minutes without decoded audio. A slight
change in Doppler and delay can be seen 20 minutes into the hour, but the
2nd TX was so weak here that the reception was unaffected. The stronger TX
was about +30dBuV and the weaker about +10dBuV.
(Terje in Stockholm-SWE, drmrx May 21/23)

Es handelt sich um einen SFN-Test aus Krasnodar und Kaliningrad.
... hier "Radio Mayak", SNR 8,5dB, kein Ton, S7.
Robust in Mode B, 4-QAM/SM 16-QAM, 2s Inteleaver, 14,06 kbps; allerdings
hier Vierweg-Ausbreitung, wobei sich die zwei staerksten Wege um fuenf (!)
Millisekunden voneinander unterscheiden und der Decodierung zu Audio das
Genick brechen.
(Nils Schiffhauer-D  DK8OK, A-DX May 23)

----- Original Message ----- 
From: "Christoph Ratzer" <>
Sent: Thursday, May 23, 2013 8:35 PM
Subject: Re: [A-DX] UNIDentified in DRM

>> Kann 'wer' mal mit seinem DRM G'lomb hinein hören?
> Hallo Wolfgang, dazu kann ich mitteilen:
> Hello, Mr Ratzer!
> If You are interested, now (21/05/2013-29/05/2013) is tested on
> broadcasting in the DRM format at frequencies:
> 9740 kHz
> 9820 kHz
> 7370 kHz
> 7430 kHz
> With Best Regards,
> СТО "Clobal Broadcasting Network"
> Roman Shumilkin
> tel.  +7 495 950 6999
> fax. +7 495 950 6102
> 73 Christoph
> http://remotedx.wordpress.com