I just bought a 3900 on eBay as an extra receiver. I have a 508 that is working great. I unhooked the 508 and plugged the 3900 into the same location and am getting a problem when testing the switch. The table displaying switch inputs has an X where in the first column, where 119 and Odd ought to be. The other columns display the expected 119/Even, 110/Odd, 110/Even, 148/Odd and 148/Even. I retested the switch throught the 508 and 119/Odd shows up just fine. I went back to the Point Dish/Signal page and set the Satellite to 119 West, the started playing with different transponders. I noticed that some are working. After checking a few, I found that transponders 2,4, 5, 6, 7 are working fine, but 1, 3 and 9 say "Not Locked." I'll try removing the switch tomorrow. Could it be poor cable? Is the 508 better with lower grade cable? (I had some cheap stuff laying around when I installed the 508 and it worked, so I never worried about it until now.) Any hints before I take more drastic measures would be much appreciated. Thanks!