No, its terminology used by HAM radio enthusiasts.  It means a loud and clear signal is being recieved and sent.  That's why you will see it in a lot of q posts.  I suspect it's one of the 6-9 people that make up q, they have a style of writing.  Maybe when they are writing the history books we might learn who those posts come from.  Just like we know the Q+ posts come from POTUS.