Sorry I'm not a sat tech. I have two H20 and three DRD425RH. 5 LNB Multi-sat. I have two dishes, one on the house which services the two HD receivers and two 425's and another dish on the shop that services a 425. This week two of the 425's had to be reset because I could not change to any three digit channels. I'm thinking it could be weather related because we've had some nasty hail storms. The funny thing is that the HD recievers are fine.