There are a few sources on the net for the Russian marine or cluster beacons, you will get a result via Google. A friend in the UK sent me a PDF file which is well worth reading and sending to Desktop:
MX - Russian HF Beacons by Ary Boender 15th November 2014
Another worth reading and keeping a copy of is the following in PDF (extensive Russian one letter beacon lists on pages 36, 37 & 38):
December 2012
You have to remember that the listings are a guideline only and the beacons do come and go, and quite often, change frequency. I find both of the above very helpful. Alan Gale informs me that he is in the process of reviewing and updating his publication in the coming weeks. Jack VK2XQ
Thanks Jack. The 2014 Ary Boender PDF is not available via Google as far as I can see. I tried sending an email to Ary to see where it can be downloaded.
MX has a five year old 2012 PDF on line at
http://www.numbersoddities.nl/MX-profile.pdf MX
–
Russian HF Beacons, a.k.a. Single Letter Beacons, Single Letter High Frequency Beacons, Radio Beacons, Cluster Beacons, Channel MarkersAlan Gales 2012 article is still here:
http://www.ndblist.info/beacons/beacons.pdf so an update would be good.
Jim