Quote:
Originally Posted by be236
Hi,
Looking at a DTV dish/LNB which picks up CP sats, you can't "turn" the LNB any direction. It connects to the LNB arm in one direction, so I would think there's no concept of "skew" for CP sats... |
In theory, if you are using a true CP feedhorn, no, but if you are using a modified linear feed to receive it, then yes, skew is important. I have one of my CP lnbfs attached on my big dish, and it sure seemed to me that it's performance changed when I rotated it, but I may have changed other things too.
Quote:
Originally Posted by be236
As for AMC 16 (118.7w),I read on another site that that it is indeed some hybrid/special sat that broadcasts is some funky circular polarity format, but its frequency output values are typically linear frequencies. I tried to pick this signal (any signal really) when I aimed here and set my LO to 11250 (for CP) but in the Fortec Classic, it would not let me blind scan to lower freq ranges that belongs to LP transponders (an artificial SW limit I guess since it assumes no CP broadcast in this lower freq range)... |
I assume you are talking about using your CP lnbf for this, and not your linear, because you don't change your LO freq to match the satellite, your LO freq must match your LNBF. {Ie I can pick up many CP transponders on my standard 10750 linear lnb, and I do this by just leaving the LO freq on 10750, since that's the LNB I'm using. But if you're using your CP lnbf, then 11250 is correct.}
But yes, receivers won't tune below 950 MHz, regardless of what band you are on. Ie this means they won't tune below 12200 if you're using a 11250 LO freq, and it won't tune below 11700 if you're using 10750, and won't tune above 4200 if you're using 5150. It will tune about 1000 MHz above the lower limit. Ie I think my Fortecs will tune up to about 12700 using 10750, but won't go below 11700.
Quote:
Originally Posted by be236
However I have heard reports of people with LP LNB can pick up those lower freq TPs but they signal strength is really low, like 40-50% and it's spotty at best.
I also saw a post for a "special" LNB that was designed to pick up those TPs for that particular sat... (heh)...
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I don't have any problem with the AMC16 sat using my linear LNB, however that's on my big dish, where polarity is variable, and it might have something to do with the particular feedhorn. I seem to remember that I didn't have quite as good luck with my 90CM dish, which has a non-variable polarity, ie only H/V and not between.