30w

[danristheman]

just got 30w tonight will post pics tommarow got 30% quality with my slimline dish with dishnetwork super dish lnb.



Dan Rose

Warning: This is an Old Thread This discussion is older than 90 days. information contained in it may no longer be current

[danristheman]

here are some pics of my mortar tube i call it that I use for my satellite dish holder.

[phlatwound]

Good job on getting 30W, that one can be a challenge.

I'm guessing that LNBF is looking for a "round" (offset oval) dish, so it probably isn't being illuminated by all of your Slimline.

That is probably the same situation I had on one of my 30W experiments, a LNBF that was not being fully illuminated by a Slimline (elliptical) dish.

Don't know if it would help you any, or if you want to mess with it, but you might try setting your LNBF to zero degrees skew, and skewing your whole dish instead. Here is a thread with some pics of how I did it, might give you some ideas.

http://www.satelliteguys.us/threads/...e-fixed-on-30W

[danristheman]

I had to use what I had to work with. i'll check that out the post you made about you getting 30w.

dan rose

[Anole]

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Elliptical dishes always come with a skewable mount.
Elliptical dishes should always be skewed.
An elliptical feedhorn will illuminate the entire dish surface.
An elliptical dish with matching feedhorn will have the beamwidth of a round dish of the same width.
Signal level may be a bit lower, but adjacent bird interference will be reduced, raising sig Quality.

A round feed gets signal from entire dish width, but nothing beyond top & bottom dish edges.
This raises the noise level, lowering performance (which may be fine on strong signals).

Regardless of all the above, feedhorn efficiency plays a role.
example of good: Primestar 84e
example of poor: SuperDish 121
Medeocre band stacked FSS LNBs can be much improved with a better feedhorn.
eg: discussion by Pendragon
http://www.satelliteguys.us/threads/...ht=Bandstacked

See this thread by Tech#344, also recommendation for better lot numbers of LNBs
http://www.satelliteguys.us/threads/...highlight=Dp34

There are other good "how I made my own Feedhorns" stories on the forum.

Do we need an elliptical dish FAQ?



Secondary LNBFs mounted off to the side of the central LNBF play by different rules, which distract from the simplicity of this discussion.


laboriously typed on my iPhone 4.

[Bongu]

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I agree with skewing the dish. I dont see any skew on the feed that you have installed on it from the pictures. for me, 30W is a pretty radical skew:

Your Location	Satellite Data	Dish Setup Data
Latitude: 42.1656° Longitude: -88.2942°	Name: 30W HISPASAT 1C | HISPASAT 1D | HISPASAT 1E | SPAINSAT Distance: 40112km	Elevation: 14.5° Azimuth (true): 112.5° Azimuth (magn.): 115.8° LNB Skew [?]: -43.2°