I am able to get most transponders with reasonable quality. Some of them are so weak and the one i am trying to get, which is transponder 4169 R 18390. I get no signal at all! Is anyone out there able to get this transponder? If so tell me please. I've got a LNB BSC621 with a di-electric plate and a ten foot mesh dish. I've tried to change polarities but still no signal quality or signal strength, and like I said with the same equipment i am able to get most of the other transponders. Thanks.