Hi CoffmanStarter,
The 502 series of recordings were made when the Blackjacks were in the vicinity of the UK. A quick right click "translate to English" provides the following.
"Channel put forward the theory that in the next few minutes the aircraft from the Russian Federation will leave "the British zone of interests", but it may be in this area of other partners of the United Kingdom on the block NATO Entries cryptograms for balance: board 44732 passed cipher: 727 board 44732 passed cipher: 502 411 447 132 196 010 565 564 978"
??-160 ? ?????? ??????????????. 17-02-2016: galandeczp