Query on VDL2 log file

Paul Gulliver
 

I'm receiving vdl2 data via an SDR receiver and virtual audio cable.
On the first line of the log file I get "<RX> 08/10/19 13:20:41 UTC - VDL2 (MPSK V.4.40)  (136.966014 MHz [ AF=1000 Hz])"

Where does the 136.966014MHz come from, this is not the frequency I'm receiving, in face how would Multipsk know what frequency I'm receiving if the data is fed from audio?
I noticed this has only started occurring in V4.40 - the frequency is not showing earlier versions

Paul

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