Where to point is very important, but also not less important from where to point . So, for CM120 LNB's Phase center should be located exactly in antenna's Focal point. And antenna's Focal point is 1220mm from upper point of the working area and 720mm from lover part of the working area of the dish. From that Focal point LNB should be aiming 791mm down from upper point of the working area.Where's the lnb pointing now?
That is exactly what has been done on original CM LNB holder- it holds LNB some 15-20mm lower than needed.with other lnb point - for example take down the mount lnb point with 5 - 12 mm
I think original CM LNB holder keeps LNB even more down than i marked by red dot. And, in addition it keeps LNB pointed to the wrong place on antenna's surface - to the very middle of it, which is very wrong .Is red dot lower In vertical than original position ?
Practical antenna focus should be = to theoretical one. Otherwise we will not get best performance possible.we don't know practical antenna focus just theoretical
Of course I am. It is well known that gregory-systems work better than simple offset ones, why should we hesitate to make our systems work better?!do you plan to add subreflector
I do not think i will be able to manufacture one, so will take original from Fibo antenna.where would you find a subreflector to match CM dish
Trust - this is really pioneering work what you are doing. What could be interesting for Laminas users is the extent of difference in signal when you us the new LNB holder . I am the owner of the older version of 120 and I have also replaced the 2 tubes with 6 mm Inox treaded rods (see the pictures)..it would be interesting using your home made LNB holder to see the possible improvement of the signal.
Humaxboy
Why not good? Great- we see that SatBeams shows more or less reliable data. But it does not show that 7,3*W also receivable more North, even in UK and Scandinavia.I'm not a good reference, but hey, these are the levels from Madrid to 94cm, IBU of 0.2dB and 40 meters low loss cable (28dB/100m).