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Guest Message by DevFuse

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International equipment needed?


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29 replies to this topic

#26 OFFLINE   HoTat2

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Posted 18 March 2014 - 10:59 AM

Although on a different but related issue, I am curious as to what would be the advantage of using an elliptical dish with a single LNBF for a service that uses circular polarization like I see some Ka band satellite internet services doing?

 

Like the Dishnet internet ODUs I notice going up around my area lately for instance.

 

Could this article perhaps be the reason why?

 

http://www.satsig.ne...rientation.htm 

 

 


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#27 OFFLINE   P Smith

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Posted 18 March 2014 - 11:27 AM

perhaps to exactly reduce interference from adjusted satellites



#28 OFFLINE   veryoldschool

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Posted 20 March 2014 - 11:11 AM

"Hopefully" this might get put to rest with a couple of screen grabs off dishpointer

 

95W 0.PNG 95W 40.PNG

 

 

"True" AZ + LNB skew = 180


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#29 OFFLINE   HoTat2

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Posted 21 March 2014 - 10:49 AM

"Hopefully" this might get put to rest with a couple of screen grabs off dishpointer

 

attachicon.gif95W 0.PNGattachicon.gif95W 40.PNG

 

 

"True" AZ + LNB skew = 180

Alright;

 

But I still see dishpointer here indicating the same thing. Whether an earth station is at or well north of the equator, a "normal" N-S vertically aligned satellite at a station's local noon longitude meridian will have any vertically linear polarized signals in the same N-S plane and thus exactly perpendicular to the Clarke belt and thereby horizontally polarized ones are parallel to the belt of course.

 

Thus a dish's horn antenna must naturally be oriented the same way to receive the desired linear signal polarity.      


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#30 OFFLINE   veryoldschool

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Posted 21 March 2014 - 11:08 AM

Alright;  

I think it's been a long way to get to "the same place".

The "feed horn" has to align with the SAT, which is perpendicular to the Clarke Belt "at its location".

Dish "tilt" for multi-SATs isn't exactly the same.


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