That Tp is trickier!
Try the following it might(I mean it might) work.
1. If your lnb is set to Horizontal, (the lnb chest(box like) faces your right)the mere insertion of dielectric plate (as pictured below), will give you a very high signal quality, probably 80, but when scanning, it won't give you anything.
Now if you change the dielectric plate to cut between the two probes, to make it Vertical instead of Horizontal, it will give you a very unusual and very unstable vertical signal quality of like 57 suddenly goes to 0 and back to 57 in a rate of like evey 2-3 or 5 seconds all through.
Now for me i say that is the problem.
When you actually (think you have nailed it), you haven't, that is just an amplification effects you are receiving and that's what even your receiver gets but the actual signal is very weak.
However some receivers, may work around through the amplification effects and get the channels, but many receivers won't do that and its why you don't receive the channels.
My thinking( I may be wrong)
Try skewing your lnb towards left, so that the reading of the tp should give you an exactly strong vertical signal( left)( not because you have set your dielectric plate to receive vertical ) but the actual lnb should be set to receive vertical signals, while your dielectric plate inserted to support the vertical signal. Once they hit green. Scan.
This is just my thinking coupled with some little experience, as some tp, unless the lnb is set towards the actual polarization, cheating them using dielectric plate may not work, they may hit green but scan as many times as you can, but won't yield.
You may try it, but I'm not guaranteeing that it will certainly work.
So if you are really into them try it, after all the learning curve should always go up to keep up with ASAS challenges.
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