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Guest Message by DevFuse

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So, where is the dish REALLY pointing?


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5 replies to this topic

#1 OFFLINE   mikemyers

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Posted 23 February 2013 - 04:49 PM

People here have explained to me why the dish isn't pointing where one would think, because the signal is being reflected at an angle to the LNB.

It took forever for this to sink in, and I just found an illustrated web page that shows and explains this perfectly:

http://www.satsig.ne...offset-dish.htm


The dish they show is a "22 degree offset dish". Can anyone clarify what the figure would be for a DTV oval Slimline dish?

Along with this, I found a very handy, and free, utility for my Android phone that helps with this:

https://play.google....ugmentedreality

...now that I've got my compass calibrated, it seems to be working just fine!)

...Ads Help To Support This SIte...

#2 OFFLINE   prospect60

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Posted 23 February 2013 - 07:32 PM

Actually I think that chart may have been made to describe D*. The offset is somewhere in that 22 degree area. I think with the Multisat Dishes it a little harder to say exactly compared to the old 18x20 single sat dishes, but it's not too far off -- 22-25 degree offset

#3 OFFLINE   BobStokesbary

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Posted 24 February 2013 - 11:11 AM

Mike,
Thank you very much for the url to Satellite AR. I downloaded it this morning and it really works. This will be super when we are on the road in our RV to check for line of sight. What a wonderful find.

Again, thank you.
Bob

#4 OFFLINE   mikemyers

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Posted 24 February 2013 - 02:30 PM

I'm glad - it's nice to be able to contribute something to this forum, after all the help I've been getting.

You might also want to check out SatFinder (this is the free version, but there is also a "pro" version):

https://play.google....satfinder&hl=en


It too uses artificial reality to show where the satellites are, but it's far more complicated (at least for me), and I haven't yet figured out how to use it, even after reading all the detailed information on their web page:

http://esys.com.pl/satfinder/?lang=en

#5 ONLINE   AntAltMike

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Posted 28 February 2013 - 10:41 AM

What is trickier to estimate or calculate is the azimuth differential between the apparent horizontal "aim" of the dish, as perceived as the perpendicular of its backplane, and of each satellite signal path of a dish that has been rotated to the local skew angle.

Edited by AntAltMike, 28 February 2013 - 11:28 AM.


#6 OFFLINE   BobStokesbary

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Posted 02 March 2013 - 12:41 PM

Mike,
Sorry for not responding earlier, but I just got around to checking out your second suggestion. This is great too. I just downloaded it and checked it against a website version. Both have the same readings and I don't have to enter my address since it is picked up by the GPS on the phone. This will be very nice to have on the road.
Bob




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