Thinking on this beacon made my brain itch.... and it hit me... sounds exactly like a Russian MX cluster letter beacon. On a whim I went over to 13527.9 and 16331.9 on one of my other home receivers where I can currently copy those known S beacons from Severomorsk. This beacon is exactly in sync with both of them. Never believed in coincidences. And it being at a .9 KHz frequency fits. Sure enough, there are loggings for the Russian S beacon in the Russian MX loggings for 7508.9 KHz. My bad, I did not have that frequency listed in my MX beacon info.