My friend decided to upgrade to HD and an HD-DVR at his home. He hasn't been a customer for long and directv could not guarantee he would get a SWM LNB for an install. He has fiber to the curb and only one coax run to every room. He didn't want holes in his house. So I suggested that he could just order the HD-DVR and go buy a slimline with a SWM LNB and I would help install it. I had recently done an upgrade of my slimline to include a SWM LNB so I thought it would be a pretty easy swap out. We get the dish setup and aligned. Sat 101, 110, 119 all around 98-100 in signal. Sat 99 and 103 sitting at 90s or higher. Everything seems fine. Couple days later he says that HD channels are dropping out. Checked the signal strength and the 101 was sitting in the low 80s. He tried to realign the dish and couldn't get the 101 sat over 85 strength. I went over yesterday and I did an alignment from the start and never got above 87 on the 101. I knew something had to be wrong. He had his internet cable line near by so we jacked that and swapped everything to use that cable and went through the alignment process. Everything back up to really high 90s. Everything was working smoothly. This morning, he tells me a few hours after I left, it dropped back to the mid 80s on the 101 again. I am baffled by this behavior. What are the odds that two cables failed? The receiver he got was a refurb HR21. Could the receiver be the issue? If so how is he going to prove that? Or is this a SWM LNB/power inserter issue. The cable run is right at 150 feet. About 100ft from dish to SWM power inserter. 50 feet from power inserter to receiver. No splitters yet. Yeah I know that is pushing it distance wise. I am just baffled by the fact that it works perfectly for a certain amount of time then drops signal by about 20%.