A
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Guest
Hello,
Todays little challenge:
I don't quite understand why the LNB mounting with my Viasat-supplied Telesystem PE57 works. The LNB is a Sharp BS1R8EL400A that came with the dish.
As can be seen from the pictures:
1) the dish is not circular, and nothing on the package or internet suggests that the feedhorn is adapted to the oval shape (as e.g. LNBs for Sky minidishes are).
2) the LNB is clearly not pointing to he centre of the dish. At all.
There are no adjustment means for the LNB holder - it can only go on in that angle.
With a "normal" round and direct view of an offset dish, the LNB in this configuration seems to be covering quite a lot of non-dish, and probably missing other parts of the dish (and/or getting a good chunk of LNB holder as well).
Either the dish is incredibly badly designed (unlikely), the LNB is highly customised for this odd-shaped dish (more likely), or there is something I have missed entirely on how offset dishes work (also likely)...
Googling the Sharp LNB seems to show that it is standard quad-LNB, no special letters or markings as with LNBs for Sky minidishes. And you can buy the dish without an LNB, with no special instructions for choosing one. Which does not support the idea that this is a specialised LNB (e.g. with special feedhorn).
Unfortunately I have not had sufficient opportunity to take the feedhorn cover off and physcially check, as the LNB and dish is in more or less constant use
It should be noted that it works remarkably well, I get something like 74 dbuV and C/N of 11-12 from main channels on 1W. And it feeds to separate boxes over individual 30-35 meters of cable with no problem.
What do ye gurus think?
Todays little challenge:
I don't quite understand why the LNB mounting with my Viasat-supplied Telesystem PE57 works. The LNB is a Sharp BS1R8EL400A that came with the dish.
As can be seen from the pictures:
1) the dish is not circular, and nothing on the package or internet suggests that the feedhorn is adapted to the oval shape (as e.g. LNBs for Sky minidishes are).
2) the LNB is clearly not pointing to he centre of the dish. At all.
There are no adjustment means for the LNB holder - it can only go on in that angle.
With a "normal" round and direct view of an offset dish, the LNB in this configuration seems to be covering quite a lot of non-dish, and probably missing other parts of the dish (and/or getting a good chunk of LNB holder as well).
Either the dish is incredibly badly designed (unlikely), the LNB is highly customised for this odd-shaped dish (more likely), or there is something I have missed entirely on how offset dishes work (also likely)...
Googling the Sharp LNB seems to show that it is standard quad-LNB, no special letters or markings as with LNBs for Sky minidishes. And you can buy the dish without an LNB, with no special instructions for choosing one. Which does not support the idea that this is a specialised LNB (e.g. with special feedhorn).
Unfortunately I have not had sufficient opportunity to take the feedhorn cover off and physcially check, as the LNB and dish is in more or less constant use
It should be noted that it works remarkably well, I get something like 74 dbuV and C/N of 11-12 from main channels on 1W. And it feeds to separate boxes over individual 30-35 meters of cable with no problem.
What do ye gurus think?