Originally Posted by RENATOA
They are all the same, the source is not important, fortunatelly the unique mfr of these modules make the final user job easier.
But beware to not get Airwave modules instead, those are indeed other story.
They are not all the same.
Two main things to consider. a) Band strapping. Most modules sold are strapped to band "e", but i.e. RangeVideo sells modules (and matching RC305 receivers) strapped to band "a". The modules can be opened. I posted a way to modify them some months ago.
b) voltage regulation. There are variants of this module around with an aditional internal 3.3v linear regulator. Most modules don't have that.
The one refered to is band "e" without voltage regulator. That's the most frequently seen incarnation of this module.