Large dish stability?

M

makum101

Regular Member
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Tenerife South, Torviscas Alto
#1
Hi.

Im considering having a 3 metre prime focus or 2.4metre offset (chanelmaster) dish installed on my flat concrete roof to enable me to get all of the Astra (Sky) channels.

I live right up the side of a hill (mountain!) in Tenerife and it gets really windy. It moved my 90cm dish slightly last winter - just enough to loose the signal.

How stable are large dishes? do any of you installers have anything that may help me in my installation? Would prime be better for stability than offset?

I have had a survey from three installers and some say no problem while others have said there not sure :rolleyes:
 
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dabba

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Surrey
#2
makum101 said:
Hi.

Im considering having a 3 metre prime focus or 2.4metre offset (chanelmaster) dish installed on my flat concrete roof to enable me to get all of the Astra (Sky) channels.

I live right up the side of a hill (mountain!) in Tenerife and it gets really windy. It moved my 90cm dish slightly last winter - just enough to loose the signal.

How stable are large dishes? do any of you installers have anything that may help me in my installation? Would prime be better for stability than offset?

I have had a survey from three installers and some say no problem while others have said there not sure :rolleyes:
Thats amazing 3M and My little 88cm upsets the missus !
I still only manage to get 70% signal on sky, must be the cable run !

Good luck with the wind
 
closetosoton

closetosoton

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#3
would a larger mesh dish be more stable in the wind? dunno, just guessing....

-cts
 
gameboy

gameboy

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#4
dabba said:
I still only manage to get 70% signal on sky, must be the cable run !
You're in Surrey and makum101 is in Tenerife - maybe that explains the diffarence in signal.
 
dxsat

dxsat

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#5
If the installer uses a 168 mm ChannelMaster mount post in enough concrete it should be OK.They are very robustly built.
The 2.4m can withstand winds up to 50 miles per hour and stay stable. More than 125 miles per hour and you'll be looking for it on the next mountaintop.
 
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spiney

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#6
A larger dish has higher gain, but at the expense of a narrower beam. If dish moves, even slightly, you lose the signal. A minidish is more tolerant in that respect.
 
dxsat

dxsat

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#7
The difference between ChannelMaster and the other dishes are the ribs moulded into the back and the size of the LNB support legs and the mount post. I had a problem with a 1.5m Gibertini flexing in high winds here in Madrid, but they are of a much lighter (aluminium) build and are not suitable for professional use, unlike ChannelMaster. It really depends just how exposed the site is. Can you put in a windbreak?
 
BLUEPLATINUM

BLUEPLATINUM

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#8
makum101 said:
How stable are large dishes? do any of you installers have anything that may help me in my installation? Would prime be better for stability than offset?
I have a Channel Master 2.4m dish installed here in Gran Canaria. All installers here are paranoid about the wind and recommend concrete bases at least 1m X 1m.

Mine has been installed with such a base and is totally stable. As long as the building is strong enough to support the weight of the base and dish (which tends to be the case with the Canarian building methods) you will be fine.

ADVICE: Ask around for installer recomendations. Mine was originally supplied and installed by a right cowboy who I selected based on his flash advertising. Personal recommendation is much, much better!!!
 
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