Is a bigger dish better? (1 Viewer)

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zmwp01

Supporting Founder
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Oct 23, 2003
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Tulsa, OK
I currently have a tripple LNB 18x20" dish feeding my ZenithSATHD520
Directv receiver. I am going to keep this when my new HD-TIVO comes in.
If I add a new dish for the the HD-TIVO, is the larger dish a benifit?
I occasionally experience loss of signal during severe storms or heavy snow.
Any experiences or suggestions would be welcome.


Cheers,
Tulsa
 
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mick_murray

Active SatelliteGuys Member
Nov 12, 2003
23
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If the dish is peaked to the maximum you should not have any problem. All dish have the potential of a rain faid but it will be kept to a minimum by maximizing the dish allignment.
 

Ray H

New Member
Jan 31, 2004
3
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Southern Kaulee-for-knee-yuh
A larger dish would not prevent rain fade in strong storm activity. It would only delay the onset. You also have to take into consideration the extra wind shear effect on the larger area of a bigger dish. A snapped mount could leave you with the ultimate rain fade. (I believe I read somewhere that Oklahoma is subject to some wind and thunderstorm activity occasionally. Probably just a rumor...)
 

zmwp01

Supporting Founder
Supporting Founder
Oct 23, 2003
51
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Tulsa, OK
Ray H said:
A larger dish would not prevent rain fade in strong storm activity. It would only delay the onset. You also have to take into consideration the extra wind shear effect on the larger area of a bigger dish. A snapped mount could leave you with the ultimate rain fade. (I believe I read somewhere that Oklahoma is subject to some wind and thunderstorm activity occasionally. Probably just a rumor...)

Thank you Ray,
Your comment about wind effect on a larger dish is definitely a valid
concern, glad you brought that up. This is the tornado belt so high winds
is an issue here. :(
 

Ray H

New Member
Jan 31, 2004
3
0
Southern Kaulee-for-knee-yuh
A larger dish would not prevent rain fade in strong storm activity. It would only delay the onset. You also have to take into consideration the extra wind shear effect on the larger area of a bigger dish. A snapped mount could leave you with the ultimate rain fade. (I believe I read somewhere that Oklahoma is subject to some wind and thunderstorm activity occasionally. Probably just a rumor...)
 

Tyralak

SatelliteGuys Master
Oct 21, 2003
5,702
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Secure, Undisclosed Location
zmwp01 said:
I currently have a tripple LNB 18x20" dish feeding my ZenithSATHD520
Directv receiver. I am going to keep this when my new HD-TIVO comes in.
If I add a new dish for the the HD-TIVO, is the larger dish a benifit?
I occasionally experience loss of signal during severe storms or heavy snow.
Any experiences or suggestions would be welcome.


Cheers,
Tulsa

A larger dish is ALWAYS better. It allows you to collect more signal, and makes it less suceptable to rain fade.
 
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wa1hog

Active SatelliteGuys Member
Jan 26, 2004
15
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A larger dish also narrows the beam width. AT 10GHz or so the bean width of the dish you have is about 3 degrees. If you get a larger dish the beamwidth narrows.

That means it will be harder to aim and easier to get blown out of alignment.

You cant get something for nothing. There is always a trade off.
 
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