Captain Protasiuk spoke with contrloller Plusnin.
Forgot who exclusively spoke with Yak on the ground. Was it 2nd pilot or navigator?
To the neighbour forum it seems they used different frequencies, and each kept to their own. One for captain to speak with the ground control, another frequency I think was used by the nav. to speak with the Yak.
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Various radio lovers say it's unlikely that at some point there was a hole/interruption in which controller and captain couldn't communicate, because one was above and the other under him in the ravine.
That the frequency Capt.-Controller used is known by radio-lovers for excellently bending round the curves on the ground and getting down into various holes. Just to note their comms would go un-interrupted, the whole route, in spite of the plane's position below the runway.
It's 130 smth. They say 400 smth is bad, for comms in tricky terrain, but that 130 smth is perfect.