How is dish size specified for non-circular dish?

A

Artist 2004

Anatolia correspondent
Messages
252
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
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

gameboy

Ding Dang Doo
Messages
4,305
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
Elliptical dish?

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

Artist 2004

Anatolia correspondent
Messages
252
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
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

Lancelot

Retired Mod
Messages
3,638
My Satellite Setup
SS1.
125cm Gibbi with Channelmaster feedhorn and Inverto C120 twin.
36v H to H 62E - 61.5W
My Location
South central
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.:)
 
A

Artist 2004

Anatolia correspondent
Messages
252
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
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.
 
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