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Old 02-04-2007, 08:46 AM   #1
Babar
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Orbitron SX 12 (12 Feet Dish Antenna)... Some Information is required

I have Orbitron SX 12 (12 feet aluminium dish Antenna).
Its manufacturer specified Focal length 50.25 Inches in its manual.(website also refers the same)
When I assembled and installed it and measured its focal length, it came out 44 inches. Its an huge difference (6 inches). Then I measured, its feed support legs. (all 4 have same length that is 6 feet)

Can anyone have Orbitron SX 12?

Kindly measure length of its feed support legs and do reply so that I match it with mine.

I think, mistakenly I have received incorrect feed support legs.

I also sent an email to Orbitron current supplier but failed to get reply from them.

Kindly assist anyone.

Regards
Babar

Last edited by Babar; 02-04-2007 at 08:49 AM.
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Old 02-04-2007, 09:21 AM   #2
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Can you post pix??
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Old 02-04-2007, 10:29 AM   #3
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I have an SX12. I will measure the legs & let you know. I put this dish up in 1994 so its been a while. From memory the handbook was not much fun as it was written with the northern hemisphere in mind etc.
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Old 02-04-2007, 11:31 AM   #4
Babar
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Thanks for your support

Quote:
Originally Posted by Jacko View Post
I have an SX12. I will measure the legs & let you know. I put this dish up in 1994 so its been a while. From memory the handbook was not much fun as it was written with the northern hemisphere in mind etc.
Please do reply as soon as you measure length of feed support legs.

Thanks
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Old 03-04-2007, 04:25 AM   #5
bassett
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Quote:
Originally Posted by Babar View Post
I have Orbitron SX 12 (12 feet aluminium dish Antenna).
Its manufacturer specified Focal length 50.25 Inches in its manual.(website also refers the same)
When I assembled and installed it and measured its focal length, it came out 44 inches. Its an huge difference (6 inches). Then I measured, its feed support legs. (all 4 have same length that is 6 feet)

Can anyone have Orbitron SX 12?

Kindly measure length of its feed support legs and do reply so that I match it with mine.

I think, mistakenly I have received incorrect feed support legs.

I also sent an email to Orbitron current supplier but failed to get reply from them.

Kindly assist anyone.

Regards
Babar
Easest way is to forget what it tells you the focal length should be and work it out yourself,
diameter of Dish X diameter of dish
over
Depth of dish X 16

Then when you have that, measure it out on a length of wood, get someone to hold the wood in the middle of the dish and meaure from the wood to the lip of the dish, or where the arms are attached, then deduct a third of the diameter of the scalar ring, to allow for that.

With C-band you have the added advantage, of being able to adjust the
focal length, by sliding the LNB through the scalar ring.

A small point, have you assembled the supplied arms, to see if it does in fact work. You may be able to pack the arms of the dish with a threaded rod, to increase the length of the rods.
Also are the measurements supplied related to a Ku or a C-band LNB
Ku arms will be slightly longer, due to the fact there is zero adjustment of the LNB, and the LNB mount is smaller in diameter.
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Old 04-04-2007, 03:43 AM   #6
Babar
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Please reply

Kindly reply with the length of feed support legs

Thanks

Quote:
Originally Posted by Jacko View Post
I have an SX12. I will measure the legs & let you know. I put this dish up in 1994 so its been a while. From memory the handbook was not much fun as it was written with the northern hemisphere in mind etc.
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Old 04-04-2007, 11:15 AM   #7
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I will when I return home. Away due to work right now.
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Old 05-04-2007, 04:05 AM   #8
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Hi

My strut lenghts are 870mm from end to end. I did bend them a bit when I re aligned the dish last year when I decdied to get NASA glitch free (Which is up again as we speak) with a HP spectrum. I have attached some photos. I did not punch through the mesh when I installed the struts I used these litlle brackects.
Attached Thumbnails
Click image for larger version

Name:	ADL Feed.JPG
Views:	200
Size:	565.1 KB
ID:	5147   Click image for larger version

Name:	SX12_01.JPG
Views:	211
Size:	242.6 KB
ID:	5148   Click image for larger version

Name:	SX12_02.JPG
Views:	192
Size:	276.9 KB
ID:	5149  
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Old 05-04-2007, 04:32 AM   #9
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Jacko, shouldnt that be 1870mm NOT 870mm????
870mm wouldnt even reach the centre of your dish to hold up the Lnb...
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Old 05-04-2007, 05:13 AM   #10
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Quote:
Originally Posted by comsatman View Post
Jacko, shouldnt that be 1870mm NOT 870mm????
870mm wouldnt even reach the centre of your dish to hold up the Lnb...
Yep 1870. That makes a huge difference!!
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Old 05-04-2007, 06:35 AM   #11
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Thanks to all of you. and that's nice you posted pics which helped me alot.

Last edited by Babar; 05-04-2007 at 10:15 AM.
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