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How is dish size specified for non-circular dish?

Artist 2004

Anatolia correspondent
Messages
252
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0
My Satellite Setup
GoldMaster 7400 CIM 2MB with Kaon board 12.03.a5. Technomate 1000, Technomate 5200 USB.
Two 80cm offset dishes.
My Location
West coast, Turkey
#1
I read that I need a 180cm dish, and I want to buy a dish that is taller than it is round. What should I ask for in the shop?
 

gameboy

Ding Dang Doo
Messages
4,305
Likes
4
My Satellite Setup
DreamBox 7000s - Nokia Freeview - Several GameBoys - DS Lite - ZX81 - SNES - N64 - Saturn - Dreamcast - PlayStation - PS2 - Gamecube - PSP - iPod - iPhone - XBox - PS3 - Wii - iPad - No Life!
My Location
Scotland
#2
Elliptical dish?

The LNB should match the dish or you will pick up signal from what's behind.
 

Artist 2004

Anatolia correspondent
Messages
252
Likes
0
My Satellite Setup
GoldMaster 7400 CIM 2MB with Kaon board 12.03.a5. Technomate 1000, Technomate 5200 USB.
Two 80cm offset dishes.
My Location
West coast, Turkey
#3
gameboy said:
Elliptical dish?

The LNB should match the dish or you will pick up signal from what's behind.
Thanks for that, Gameboy, point noted.

I started off my satellite hobby by just taking a package offered locally, Turkey, without understanding much about it, and noticed that my two dishes were elliptical with offset LNBs. I recently read about dishes on this forum, here:
http://www.satellites.co.uk/php-bin/forum/showthread.php?t=10628
which in summary says that such a dish can focus signals from more than one satellite to a single LNB. (Assuming it's designed properly!) Before I go down this route for my next dish I'm going to play with what I already have to see if it's worthwhile.

That aside, I'm still interested to know the answer to my original question.
 

Lancelot

Specialist Contributor
Messages
3,638
Likes
8
My Satellite Setup
SS1.
125cm Gibbi with Channelmaster feedhorn and Inverto C120 twin.
36v H to H 62E - 61.5W
My Location
South central
#4
The 'proper' measurement is horizontally on the widest part of the reflector.

Some dealers, the less scrupulous ones give measurements other than this to make it look like a better deal.


L.:)
 

Artist 2004

Anatolia correspondent
Messages
252
Likes
0
My Satellite Setup
GoldMaster 7400 CIM 2MB with Kaon board 12.03.a5. Technomate 1000, Technomate 5200 USB.
Two 80cm offset dishes.
My Location
West coast, Turkey
#5
Lancelot said:
The 'proper' measurement is horizontally on the widest part of the reflector.

Some dealers, the less scrupulous ones give measurements other than this to make it look like a better deal.


L.:)
Cheers, Lancelot - that's just what I wanted to know. I think I'll nip up on to the roof and see what size I've REALLY got.