I have an old STS 70MHz system. STS AA and SR, MicroWave Systems Engineering LA 4880 LNA, STS downconvertor DC-1001,and 12 foot dish. It was working fine when I last used it (some time ago). It now has a pattern on the bottom third of the screen which moves to the center of the screen on the numbers with the best signal and sometimes gives a full screen just for an instant (enough to know I'm on an active transponder) The pattern is like one you would use the horizontal hold to correct on old TVs. The signal meter moves up about half way, I can't remember how far it used to go. I have tried cleaning all connections, verified that the polorotor is moving the 90 degrees. Tried the polarization adjustments. I get 10 vdc at the terminals on the downconvertor at the dish. I tried making adjustments on the dish itself, height etc. and am where I get the best signal on the meter. I'm not even sure which satellite I'm on as the designations on this old box don't exist anymore. Any suggestions appreciated, I just hope it's not the LNA because I've had no luck locating one that will work on this system.