well there aren't that many English-language satellite boards or forums around at all.
There are those which spring up and die a quick death.
Look here for example:
There are a few that have very limited functionality or small range of forums. Eg here:
There are sequential message boards, that have no structure and are difficult to use as a real source of information. They also mainly tend to focus on one thing (eg codes, or electronics)
Oh and there's this one...
That one's not English as such. It's that strange hip-hop silliness small boyz like to use. Personally I get bored trying to figure out what they're all on about between the "Z"s, the errant capitals and names like "bitch innit" (or whatever).
There are a few principally non-English boards that have one or more English forums, but they tend to be quite restricted too.
The best of those is here:
But my advice is to start a lively exchange here under our own "digital systems" forum. If there is sufficient interst, we can dedicate a forum to it.