Quote Originally Posted by CRMS View Post
Just tried a GigaBlue Unicable LNB - 24 SCR, 2 Legacy.
Signal strengths - Unicable SNR 98/99%, AGC 8%, 16.0dB. Legacy SNR 99% AGC 97% 16.0 dB. Went through the Tuner set up correctly - I think. Signal strengths are better than elderly Universal LNB. So interesting that Unicable AGC is 8% and Legacy 97%.
Unicable is complete rubbish with continual "Tune Failed". Legacy is fine.
So tried power injection with 11.9v at the LNB. No signal at all?? Odd, so I'll bump up the voltage to 20v and see if that makes a difference.
Otherwise, grateful for any pointers??
Inserters with matching power supplies from other manufactures of unicable II LNBs suggest a 19V supply voltage.

Into which downlead are you injecting the power? It should be the unicable output and not the legacy.
When injecting power via an inserter is there a facility to stop the box also providing power to the LNB - the two power sources could be fighting each other?
How much current can your external power module supply - the spec suggests 300mA for the unicable side of the LNB ?