I remember going on an RHWR course where the instructor claimed we could not keep the notes we wrote, as what he says is so secret.
Despite the fact if you did a search on Google for radar warning receiver, it brings up two hundred and seventy eight thousand results and a nice article of Wikipedia.
Also other airforces through out the world have their own versions anyway, like the L-150 or SPO-15 rhwr thats fitted to MiG29 and SU27. So I doubt what we were told would be news to them, unless Bin Laiden wanted to come and fix our aircraft for us.