"Ant" <a...@zimage.comANT> wrote in message
news:-JednVBlU9D4iGnT...@earthlink.com...
< snip >
>> <
http://www.dishpointer.COM>
>
> Nice web site, but I am confused on its results since I am not familiar
> how this satellite TV works (always used OTA and cable):
>
> Satellite Data:
> Name: 91W GALAXY 17 (G-17) | NIMIQ 1 | NIMIQ 2
> Distance: 37698km
>
> Dish Setup Data:
> Elevation: 41.1°
> Azimuth (true): 137.7°
> Azimuth (magn.): 125.1°
> LNB Skew [?]: -33.9°
>
The satellites are all in orbit above the Equator, separated by about two
degrees. From a North American looking toward the south, they appear to lie
on an arc that's approximately the apparent path of the sun. There are
about three dozen major satellites in view for us. They all have names.
"Galaxy" and "Nimic" are just names. To keep it simple, they reused many of
the names and just numbered the next and the next and the next.
The distance is irrelevant. You ain't changin' it! (It's used for some
calculations, but not by you.)
The elevation is the measure of how much you are tilting the dish up from
the horizon. 90 degrees would be pointing straight up. 41 degrees is good
for much of the southern US. (In Central America, the elvation would be
closer to 60; in Canada, maybe in the 20s and 30s.)
Azimuth is the direction to aim the dish, left and right from your
particular spot. 180 is Due South, so 137 is generally Southeast. In most
places, there's a difference between true North and Magnetic North. The
data you have allows for that difference. (Don't use magnetic data if you
have an accurate plat map that includes the alignment of your lot lines. In
1985, when I installed my 10-foot dish, I used the map and my results came
within half a degree. One tiny tweak and I was good for 20 years.)
LNB skew is a tough one to explain but I'll try. First, you may not have to
worry about it, depending on the type of mount that comes with the dish. If
your dish is pointing Due South, the LNB needs to be straight up and down
and it will be, assuming the mount is straight. Thats a skew of zero.
However, if the dish is aimed on either side of Due South, the LNB needs to
be tilted so the signals arrive with the correct alignment, called
"polarization" (not "polarity," a common mistake). The further you get from
Due South, the more skew adjustment (tilt) is required. If the mount is
such that it automatically tilts the dish as you move away from Due South,
no adjustment is needed. Some antennas use an arbitrary scale for skew.
Go with the instructions the manufacturer provides, not my generalities.
Not every installer takes time to tweak for best performance. If you're not
optimized, you may lose the signal in a heavy rain, as opposed to the same
system across the street. There are simple, cheap meters that you can put
in the coaxial cable(s) temporarily and note the relative signal strength.
(I saw one for less than $10.00; I wouldn't go quite that cheap, if I were
you.) Some websites give you a DIY primer for installing a system and they
explain the uses of the tools.
If you then move the dish a tiny amount -- up down, left, right ...
whatever -- and the signal meter goes higher, you did a good thing, eh?
If/when you get a system, I suggest you do a Google search for <inline
satellite meter> and go shopping.
"Sal"