Size of concrete base?

bignick

Specialist Contributor
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Back in the UK and missing Cyprus!!!
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Aylesbury
#1
Hi all

I've just had to commission an engineer to work out the size of concrete base required for a prime focus 2.5m dish pointing at astra 2d here in Cyprus.

He reckons that we need a slab measuring 1.3m x 1.3m x 0.4m which equals almost 0.7m3 of concrete. This seems an outrageous amount of concrete!

Does anyone have any or know of any calculations for this area that either agrees of disagrees with his findings?

One thing that he has done that I take issue with is he has worked out the base size with the dish sitting on the vertical. He said that he has worked it out for 'worst case scenario' and even at a 50 degree angle it would make little difference but I strongly disagree with that statement.


Any help or information is appreciated

Cheers

Nick
 

Likvid

ASBO Club Member - Persona non grata
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Stockholm, Sweden
#2
Thats about what i had to my 3.1M dish back in the old days......

You need to realize there is a heavy amount of wind pressure on a dish this size.

Looked up Patriot manuals and for their 3.1M dish they recommend 1.02M x 1.02M x 0.61M.
 

bignick

Specialist Contributor
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Aylesbury
#3
That just backs up my point it think. A manufacturer quotes 0.61 cubic meter for a 3.1m dish and this engineer quotes 0.67 cubic meter for a 2.5m dish... its just too much I think!

Thanks for the info Likvid

Likvid said:
Thats about what i had to my 3.1M dish back in the old days......

You need to realize there is a heavy amount of wind pressure on a dish this size.

Looked up Patriot manuals and for their 3.1M dish they recommend 1.02M x 1.02M x 0.61M.
 

Lancelot

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SS1.
125cm Gibbi with Channelmaster feedhorn and Inverto C120 twin.
36v H to H 62E - 61.5W
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#4
Concrete and hole digging is still an awful lot cheaper than a new 2.5mtr
antenna though.

You never know :eek:


L. :)
 

iceman

Specialist Contributor
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My Satellite Setup
3.0m Motorised Channel Master + 4 fixed dish Amstrad_DRX890C
DM7020s,DM800se
UNOHM EP314 PROMAX TV Explorer
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Kyrenia - NORTH CYPRUS
#5
I use 180x180x40cm steel reinforced concrete base for my 4.2m installations...
 

bignick

Specialist Contributor
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My Satellite Setup
Back in the UK and missing Cyprus!!!
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#6
1.3 cubic meters seems about right for that size dish. Is this calculation based on experience, information from manuals or an engineers report? Have you ever had any problems with this size base on a 4.2m dish?

What size base would you use for a 2.5m prime focus?

Cheers

Nick

iceman said:
I use 180x180x40cm steel reinforced concrete base for my 4.2m installations...
 

Channel Hopper

Suffering fools, so you don't have to.
Staff member
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#9
1 cubic metre of concrete will be cheap in Cyprus anyway. I would also recommend putting two or three scaffold poles through the pit.

Start digging, or find somebody that will quote cheaper but not bother to return when the dish falls over.
 

bignick

Specialist Contributor
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My Satellite Setup
Back in the UK and missing Cyprus!!!
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Aylesbury
#10
Hi

Thanks for all the info.

Just to let you know I managed to get the engineer to lower the base size to 1.1m x 1.1m x 0.4m whuch is a saving.

Incidentally, right after I paid the guy his money I found this: http://www.dhsatellite.com/base%20pads.htm :-doh!

Cheers

Nick
 

Zorba

aka Skyman
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My Location
Limassol, Sunny Cyprus
#11
Nice pedestal,I had mini versions on my wedding cakeO-Ha but you would need a tall stepladder to adjust the skew;)
 

bignick

Specialist Contributor
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My Satellite Setup
Back in the UK and missing Cyprus!!!
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Aylesbury
#12
zorba said:
Nice pedestal,I had mini versions on my wedding cakeO-Ha but you would need a tall stepladder to adjust the skew;)
:-laugh I thought they looked odd at best - Its got to be the last word in posh (and pointless) But the information on the dish sizes to the left of the page may serve me well in the future!
 
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