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-   -   VOR 12025 kHz (http://www.drmrx.org/forum/showthread.php?t=2906)

AF4MP 31-08-2019 14:10

Russian DRM Transmission 12025 kHz
Reports of Voice of Russia DRM 12025 kHz posted on the Yahoo DRMNA group.

The signals, so far, being received in the NW USA and New Zealand.

The transmitter presumably located in the Asiatic part of Russia.

AF4MP 01-09-2019 02:28

Russian DRM 12025 kHz Reception in Kanuma City, Japan
2 Attachment(s)
A short log of the new Russian DRM station reception via the KiwiSDR web receiver in Kanuma City, Japan today.

The signal strength varied from about S5 to S8, with audio decoding occurring at just over S6.

Audio was a selection of music, in mono, good quality with an audio bandwidth of 6 kHz.

The signal disappeared at about 0205z.

The received station ID is shown in Attachment 2.

Digger 01-09-2019 09:17

Log from 31st August
1 Attachment(s)
The signal was (and is now, today 1st Sep. at 0916 UTC) very strong in Jakarta. However, at my location in Japan I can't see any traces of the signal. The content was continous music.

Note: My log was taken with a Kiwi SDR, not from Shizuoka City.

AF4MP 01-09-2019 17:43

Russian DRM 12025 kHz VOAAREA Plot
1 Attachment(s)
According to the DRMNA Yahoo Group, this 12025 kHz DRM transmitter is located in Russia at the Komsomolsk Amur Site.

If the published HFCC reports are correct then the transmitter beam passes over my receive location near Atlanta. The attached VOAAREA plot for 2200z for September shows, assuming normal propagation conditions, that there is a possibility of good signal strength there at 2200z!

As the beam also passes close to the auroral zone the audio may not be decoded due to the possible very high Doppler effects (even if the received signal is strong).

AF4MP 03-09-2019 01:39

Russian DRM 12025 kHz Reception in Kanuma City, Japan
1 Attachment(s)
The transmission started at about 2340z this evening (2-September).

This log again from the Kanuma City, Japan, KiwiSDR. The receiver timed-out after an hour of use.

The receive location is at the back end of the beam.

Audio consisted of various types of instrumental music and was of a pleasant quality.

Signal level was about S7 going up to an S8 at times. Audio drop-outs primarily due to signal fading (below S7).

Digger 03-09-2019 03:23

3rd Sep. 2019
1 Attachment(s)
I spent some time looking at different Kiwi SDR around the world and the only place with a visible signal was Japan. The strongest signal was at Matsukawa in the Fukushima region in the east of Honshu. The further west, the weaker the signal. At my place I am not getting anything at all.

Enclosed is a short log until the signal suddenly disappeared at noon Japanese time. Before that there was a short break with only a carrier to be seen. The audio BW was 6000 Hz and the sound was good. Non-stop popular music was played.

AF4MP 03-09-2019 13:56

Unfortunately there appear to be no web receivers in either Chukotka or Alaska where there probably was a good signal to be received.

A weak waterfall display was seen last night by some of the KiwiSDR's in the NW USA.

The transmitter during these tests might not be running the full published 100 KW power output.

Brendan1 03-09-2019 16:33

Three reports for VoR
2 Attachment(s)
Hi everyone, good to be back. I've got three screeshots for VoR today, just to catch up. Two this message, third one is separate.

Brendan WA7HL

Brendan1 03-09-2019 16:36

Last nights' short log
1 Attachment(s)
A bit short last night, as the waterfall seemed to disappear about 0100Z.
Found the exact location for this site - it's 50.647057N, 136.932272E.


AF4MP 03-09-2019 21:28

Hi Brendan,

Welcome back!

AF4MP 03-09-2019 23:00

VOR 12025 KHz VOAAREA Plots for Japan
2 Attachment(s)
Hi Terje,

You may be interested in these VOAAREA plots of VOR 12025 kHz for Japan (map centered on Tokyo) valid for this month.

Conditions for each hour are different; for example, attachment 1 shows the 0300z plot and attachment 2 the 0009z.

It would be interesting to know what are the actual received signal strengths.

AF4MP 04-09-2019 01:07

Russian DRM 12025 kHz Reception in Daegu City, South Korea
1 Attachment(s)
VOACAP showed that South Korea should have good reception (from the rear of the beam) at 0000z.

Here is a one hour log from the KiwiSDR in Daegu City, South Korea.

The received signal showed a strength of S9+20dB. Max SNR peaked at 25.05 dB.

Digger 04-09-2019 02:17

1 Attachment(s)
Thank you Zyg for the VOACAP plots. I am puzzled by the radiation pattern of the AHR(S)4/4/0.8 - there is nothing at my location and the noise floor is low on 12 MHz - the S-meter sits steadily on S1.

The enclosed log is from http://jp7fso.proxy.kiwisdr.com:8073/ in Fukushima, 353 km NW from me. Perhaps I should take the DR111 up there on a one-day trip!

Enclosed is a 90 minutes log. The SDR timed out twice. Some dropouts may have been caused by myself opening PDFs and using the web browser.

AF4MP 04-09-2019 03:40

12 MHz AHR(S)4/4/0.8 array
1 Attachment(s)

Originally Posted by Digger
Thank you Zyg for the VOACAP plots. I am puzzled by the radiation pattern of the AHR(S)4/4/0.8 - there is nothing at my location and the noise floor is low on 12 MHz - the S-meter sits steadily on S1.

Hi Terje,

I've attached the pattern for a 12 MHz AHR(S)4/4/0.8 array (source ITU). It has a definite but narrow rear lobe, that explains the good reception in South Korea. The side lobes are close to the main beam and don't send any signal to the rear.

Propagation will also control the path from the lobes and the rear lobe may have a high angle(s) component(s) that can cause local differences in reception, not to mention multipath fading etc.

VOAAREA shows a different coverage each hour for this back end of the beam signal. According to the plots, reception in Japan does improve gradually towards the end of the scheduled transmission at 1000z.

By the way the gain of this antenna is 21.8dBi.

The test transmission may also be running at lower than published power, which would result, of course, in reduced receive levels.

AF4MP 04-09-2019 03:55

12025 Khz Power Change
I just looked at today's HFCC file download and notice that the power output of the 12025 kHz transmitter has been changed from 100 KW to 25 KW!

That will reduce the coverage by 6 dB or 1 S-point.

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