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Guest Message by DevFuse

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Dish 500 - Hawaiian Style


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26 replies to this topic

#26 ONLINE   Jim5506

Jim5506

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Posted 22 September 2013 - 06:44 PM

Since Hawai'i is much further south that the continental US, the angle between 110 and 119 is greater there than it is in North America (you are slightly closer the satellites than we are), so, your lnbs need to be further apart or the dish needs to be moved closer to them (you might try a stack of washers on the back of the reflector - I haven't the slightest idea how many - trial and error I guess).


Tuners: Hopper 2000; Hopper w/Sling; 3 Joeys; Samsung SIR-T351; Accurian 6000;2 X HD TiVo; 2 X TiVo Series 2 Stand alone; Panasonic Showstopper 2000
Dish 1000.2 @ 110, 119, 129; dish 500 @ 61.5
Antennas - CM4228; RS U75-R; coathanger; Funke PSP.1922 (stillin the box); paperclip
Displays: Sony VPH D50Q with HD Fury HDMI input; Hitachi 57F59; Sony Bravia LCD;Sanyo 32" LCD; Panasonic 42" plasma
Sony 80GB PS3; Toshiba HD-DVD

Give me a Finco colinear array and I'll rule the world - HA-HA-HA-HA!

#27 OFFLINE   HoTat2

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Posted 23 September 2013 - 03:37 PM

Since Hawai'i is much further south that the continental US, the angle between 110 and 119 is greater there than it is in North America (you are slightly closer the satellites than we are), so, your lnbs need to be further apart or the dish needs to be moved closer to them (you might try a stack of washers on the back of the reflector - I haven't the slightest idea how many - trial and error I guess).

But if what you're saying is true, then that would mean if the D500H was installed somewhere in the CONUS, it wouldn't work. As the 110 and 119 focal points would miss their respective feedhorn throats on the LNBFs.

 

Now, I've only been a DIRECTV sub. but its a similar situation with their Alaska/Hawaii dish solution. A larger 1.2m dish reflector with a longer focal length and correspondingly increased physical spread between the 99, 101, and 103 feedhorns as well as with the 110 and 119 LNBFs on the (now seldom used) 110/119 1.2m companion dish over their CONUS versions.

 

Yet I know for a fact both these dishes work here on the mainland U.S. with the expected increased signal strengths due to their greater gain and higher signal power levels of the satellite footprints as opposed to them on the territory of Hawaii or Alaska.

 

I really think in lieu of the satellites some 23,500 mi. distance, (from earth's center) the angular separation between them as seen from earth shouldn't vary significantly with the observer's latitude or longitude to have to spread the LNB feedhorns like this. But is necessary for an increased diameter multisat dish with a longer focal length to maintain the same F/D ratio.      


DIRECTV sub. since Sep. of '95





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