I just upgraded my receiver from 2700/311 to 722k. My mom still uses her old Model 2700, can I change the receiver from 2700 to 311? Will the Model 311 work with a single LNB ? She only uses one TV. Her current Model 2700 is using a single LNB. When I change the receivers from 2700 to 311, do I need to transfer the Smartcard from the old to new? Thank you in advance for answering my questions.