So, I've been having issues with using the same Freq Trans to change what teleporters are linked to eachother, so I decided to just use them in the creation of new teleporters, right? Yeah, no... if it's been used to link one teleporter to another, the recipe won't recognize it as a proper piece of the recipe for making a new teleporter. I verified by making fresh Freq Trans's and putting them in instead of the used ones, and it worked.
So, yeah, is it a bug when the Transmitters, or is it just that they're good for nothing but recyclers once they've been used...?