LNB / Dish advice

[LAURO2008]

Had both dishes and the Gibby will perform marginally better on weaker satellites due to it's overall size.

Have you tried them with the same lnb? was it your actual one (Invacom SNH-031)?
I was told that the Invacom SNH-031 (mine is twin) starts to perform better on bigger dish sizes...so probably the gain is going to be higher on a 100cm... do you agree?

 

[satelliteman]

No the comparison was made with different LNb's but still you can get a good idea.

 

[Huevos]

I was told that the Invacom SNH-031[...] starts to perform better on bigger dish sizes

Why should it perform better on a bigger dish? Also, I see a lot of these on large dishes (2.4m for example) and don't see exceptional performance.

 

[LAURO2008]

Why should it perform better on a bigger dish? Also, I see a lot of these on large dishes (2.4m for example) and don't see exceptional performance.

Penta 85 F/D 0.7
Gib 100 F/D 0.6

Invacom SNH-031 ideal dish F/D 0.6

 

[Huevos]

Penta 85 F/D 0.7
Gib 100 F/D 0.6

Invacom SNH-031 ideal dish F/D 0.6

That is not down to dish size, it's f/d ratio. Also you are comparing the single against the twin. The built-in feedhorn is the same on both so changing from one to the other is not going to change gain/loss caused by a miss match between the dish f/d ratio and the feedhorn.

 

[LAURO2008]

That is not down to dish size, it's f/d ratio. Also you are comparing the single against the twin. The built-in feedhorn is the same on both so changing from one to the other is not going to change gain/loss caused by a miss match between the dish f/d ratio and the feedhorn.

look...I don't want to start any discussion with you but here it is the formula : f/D Ratio = Focal Distance/Dish Diameter.




[fieldset=Moderation]Text removed. As per the rules: *Please do not flame other posters, if you disagree, then please do so in a measured and civilised manner - SM[/fieldset]

 

[Huevos]

here it is the formula : f/D Ratio = Focal Distance/Dish Diameter.

Normally bigger dishes have a bigger focal distance to keep the f/d ratio the same (for example Famaval 1.4m, 1.8m and 2.3m are all 0.41 f/d ratio), but anyway changing from a single LNB to a dual is not going to change the f/d ratio of the dish.

 

[LAURO2008]

[fieldset=Moderation]Text removed. As per the rules: *Please do not flame other posters, if you disagree, then please do so in a measured and civilised manner - SM[/fieldset][/QUOTE]

Could you, please, ask that "poster" no to put words in my mouth? or sentencens never written by me?

e.g. " you are comparing the single against the twin "

Thanks

 

[Huevos]

" you are comparing the single against the twin "

Post #41: "I was told that the Invacom SNH-031 (mine is twin) starts to perform better on bigger dish sizes". Sorry if that's not what you meant but that's the way I read your post.

 

[LAURO2008]

Post #41: "I was told that the Invacom SNH-031 (mine is twin) starts to perform better on bigger dish sizes". Sorry if that's not what you meant but that's the way I read your post.

OK..no problem...I just meant that in general Invacom SNH-031 (regardless single or twin) starts to perform better on bigger dish sizes.

Case closed!

A good news for you:

The Aljazeera channels +1+2+3+4 broadcasted the first serie A matches in English...so far so good !

 

[LAURO2008]

any advice before installing it other than replacing the wing nuts?

 

[satelliteman]

Yep, feed the coaxial through the LNb boom before you align it.