25900 Khz Radio Mayak

[F1BJB]

Much fading here on this new frequency.
Very good audio but only may be 5% of the time.
http://en.wikipedia.org/wiki/Radio_Mayak
http://www.radiomayak.ru/
http://www.drmrx.org/forum/showthread.php?t=2264

[MARCEL]

Bonjour, I receive R.Mayak this morning of 25900 Khz SNR from 0 to 15,4 db but many cut is possible from fading or transmitter !!!

[F1BJB]

Bonsoir Marcel
C’était pareil ici de très bons passages puis disparition totale.

[MARCEL]

Oui bizarre un peu cette trans., voici un extrait de ma réception :

http://nsa32.casimages.com/img/2013/...4428700289.jpg

Voir le Fichier : DRM_RMAYAK_19213_10H57.mp3

[Digger]

Hi Marcel,

Did you find out the location of this TX?

[MARCEL]

Hello Digger,

I have no idea from TX location from R.Mayak, is possible from Taldom but no sur !!

[F1BJB]

Today i had nothing.
It was a DRM mode A transmission.
I believe those are not intended for long distance transmission.
Perhaps it was low power
May be I and Marcel were lucky to catch it.

# SoDiRa Software Version 0.092
# Starttime (UTC) 2013-02-19 10:28:18
# Frequency 25900
# Label Radio Mayak
# Bitrate 18.44 kbps
# Mode A
# Bandwidth 10 kHz
#
# SFrames SNR mean SNR max SNR min AUDIO
1 14.8 15.2 13.9 30
2 14.1 14.9 13.1 30

[MARCEL]

Hello all,

Since 10H02 UTC I receive R.MAYAK og 25900 Khz many cut audio SNR from 0 to 19 db is curious little time very good SNR to back to 19 db.

[F1BJB]

They are back today but no audio yet.
Edit
Sorry Marcel I missed the fact that you were the first to spot them.
I have audio now but at times it seems they switch to a 20 Khz wide mode
Or may be its my Sodira software because they managed to crash it once
witch is not an easy thing to do.
It stopped suddenly as I was writing this so I wonder if it is not an
experimental transmission.
I tried to send a reception report to one of their email addresses but no reply yet.
I used
newsmayak@radiomayak.ru

[MARCEL]

Bonjour F1BJB,

Ici audio par moment la c'est meilleur qu'au début, depuis quelques minutes déjà l'audio passe SNR à 10H50 UTC 24,1 db.

[F1BJB]

Originally Posted by Digger

Did you find out the location of this TX?

May be here:

[F1BJB]

Back again this morning.
Sudenly it rises of the noise and i get a few seconds of very good audio.
I also received CB type NBFM transmission on 25845 and 25915 Khz
Once again Mayak managed to crash the Sodira sofware and they seem to use
sometimes a 20Khz mode.

[MARCEL]

I have receive this morning Radio Mayak of 25900 SNR 0 to 24,1 many audio cut :

http://nsa29.casimages.com/img/2013/...3828740635.jpg

Voir le Fichier : DRM_RMAYAK_27213_25900_10H03.mp3

[Digger]

Wherever this Mayak is transmitting from, there is certainly no trace of signal here in Stockholm. I have to hope for an opening with MUF >25 MHz over 1500 km or until we get our first strong Es, then I might be lucky.

In case they run 20 kHz, I'm afraid it would be tricky to get anything useful out of it... I substituted my 455 kHz IF filter with a 1000 pF capacitor, then I got good decoding of Vatican on 26 MHz (those were the days... when they were up and running...)

[UA3ARI]

Hello all,

It was short (a few days) test transmission on 25900 kHz at Moscow within the framework of local SFN research.
We used 2 transmitters:
1 - 500 W, 100 m antenna height, Kurkinskoe shosse;
2 - 100 W, 35 m antenna height, Aviamotornaya st (Moscow Technical University of Communication and Informatics).
Both antennas was 5/8 CB, tuned to 25900. Transmitters was linear with modulators from RF-Mondial.
Audio content and label was "Radio Mayak", mode A, 10, 18 and 20 kHz.
"Radio Mayak" is standard test signal for all RTRN research in Russia, and at
newsmayak@radiomayak.ru do not know when and where his signal is used in the test transmission.

I confirm that this transmission was carried out on 25900 from Moscow with low power in February 2013.
We did not expect that stable long-range reception may be possible therefore not inform in advance.
Transmission on 25900 are finished.
Thank you all for observation!

Oleg