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RadioReference.com Forums
Link11 (also known as STANAG 5511) is a data protocol that is heavily used by the military and NATO. Under normal circumstances all the traffic is very heavily encrypted; however the header information is evidently readable
The catch? Only 2 packages - Procitec's go2monitor and Hoka can read it. The price? Well, there's an old Dutch saying - if you have to ask the price, you can't afford it. I won't put it here, but trust me - it's in heart attack territory. If you have a weak heart, please move on.
There's an interesting article on what you can learn from such software here....
In early November, whilst working on an article for Janes, I noticed a Link-11 SLEW signal on 4510 kHz (CF) that was slowly growing in reception strength. I’d been monitoring frequencies used…
planesandstuff.wordpress.com
Mike
[edit] - Forgot to mention that this appeared on the UDXF reflector