What I'm saying the "getting it from a museum" or "cobbling a working one from blueprints" would have added to the CG no end.Not if you think about it logically. The current 34th Century population will know generally what technology these generation ships had when they departed and can safely assume that technology, especially unused technology like communication equipment would not have changed, been upgraded or evolved very much at all. So when the Golconda started communications, it would have been relatively easy to know what equipment is required (hint it is probably in some history books). Sure they might have had to grab some comms gear from a museum or something or hastily built one using century old blueprints but all of that is quite achievable.
Maybe we could have also had to work out the other half of the communication link up to correctly talk to them.