Captain Jack
Burnt out human
- Joined
- Oct 21, 2006
- Messages
- 11,816
- Reaction score
- 7,998
- Points
- 113
- My Satellite Setup
- See signature
- My Location
- North Somerset
I seem to have an issue with my polarity switching on my main Ku LNB (Inverto something-or-other). Verticals are fine but horizonals are black.
The cable run is quite long at around 40m, plus there's a DiSEqC switch at the end of it to flip between C and Ku LNBs. The voltage at the LNB end, when H is selected, is around 17.6V. Is that enough to switch the LNB to the horizontal frequency? The C band LNB seems fine in both polarities. The switch itself causes a 0.4v drop - it's dead-on 18v before that.
Suspected a knackered LNB, I replaced with another Inverto (found in the garage) but that has the same issue. I need to spend some time at the dish end with a meter to see whether the LNB will switch to H at all - just in case the replacement one is also knackered. Also need to try bypassing the switch.
But it's annoying - something I thought was an easy fix is turning into a time sink.
Incidentally - what's a decent C120 LNB these days? There don't seem to be many around...
The cable run is quite long at around 40m, plus there's a DiSEqC switch at the end of it to flip between C and Ku LNBs. The voltage at the LNB end, when H is selected, is around 17.6V. Is that enough to switch the LNB to the horizontal frequency? The C band LNB seems fine in both polarities. The switch itself causes a 0.4v drop - it's dead-on 18v before that.
Suspected a knackered LNB, I replaced with another Inverto (found in the garage) but that has the same issue. I need to spend some time at the dish end with a meter to see whether the LNB will switch to H at all - just in case the replacement one is also knackered. Also need to try bypassing the switch.
But it's annoying - something I thought was an easy fix is turning into a time sink.
Incidentally - what's a decent C120 LNB these days? There don't seem to be many around...