Distance limits for RSBN/PRMG

I can't get the two green lights on the RSBN panel for Krymsk while sitting on the runway at Sochi. Distance is about 120 km. I can't get Krasnodar Central either. I'm wondering what the distance limits are for this nav system or even if they are line-of-sight. Before I try to fly this IFR exercise I would appreciate some intel on this, as perhaps I am doing something wrong (although I have studied xJohnxx's excellent tutorial video intently...) Many thanks.

Update: I flew the exercise and couldn't get Krymsk RSBN at all but I dialed in the NDB instead and then picked up Krasnodar Central, to which I turned directly after overflying the Krymsk NDB. I think the Krymsk RSBN must be out of service...

Just tested this, works fine for me from 230km away at 5,000m altitude.

I'm wondering what the distance limits are for this nav system or even if they are line-of-sight.

AFAIK, RSBN is a short range, UHF (1000 MHz), line-of-sight air navigation system.

I haven't checked DCS's range limits but a Russian source gives

• 500 km - the altitude of the aircraft 35 000 m;

• 380 km - the altitude of the aircraft 12 000 m;

• 250 km - at the height of the plane 5 000 m;

• 50 km - at the height of the plane of 250 m.

Just tested this, works fine for me from 230km away at 5,000m altitude.

Interesting. I couldn't get Krymsk at all in Ch. 28 but had no trouble with Krasnodar Central on Ch. 40 and that was further away. Odd. Thanks for testing.