Hello, about a year ago I upgraded to HD. The installer changed my dish to a sl3 swm. I have 2 DVRs a R22-100, a HR21-700 and 1 HD H25-500 receiver. I have a house in another state that I would bring my old SD receiver to when we would visit. I have an older 18" round dish at my other house that I was using before. My question is, can I use the R22-100 DVR with the older dish and get sd channels? Or do I need to get another sl3 swm? I know the R22-100 can get HD when it's hooked up to an HD system. Can I get the DVR to pick up the 101, 110, 119? Sorry if i am wrong about the sat #'s It has been a long time. Thanks in advance.