I used to extensively monitor the Russian Morse code V-beacon near Tashkent years ago when it could be heard short path in our evening and long path in the morning on 7.002 mHz.
I still have tapes of it sending its very rare ID on CW (it had a call believe it or not, RCQ45)
I used to listen to the many other Russina single letter beacons on 40, mostly around 7039. My goal was to DF them using my 4-square and also by using grayline maps. I exchanged emails with hams who were much closer to them.
I never heard any brief pronounced peak at precisely SR or SS on RCQ45, a beacon that probably used an omnidirectional antenna.
Note too, low band contester N4KG's thoughts on 40 meter grayline, and what he calls SR/SS Enhancement (THAT I can buy)http://www.ng3k.com/Misc/n4kgprop.html