Is Dish elevation worth considering - Techwatch Support Forums: Digital & Satellite TV, FTA, Cable, Computers, Mobile Phones, Apple and General Tech Forums

spian · 11-12-06, 11:19 PM

I'm just about to venture into the world of Sat Tv and have decided to opt for a motorised system but as I understand the motor only moves across the horizon, yet most satellites are at different elevations also. Does this mean that the difference in the elevation are not worth considering or is it only cheap motors that move in one direction:?

Jimdefruit · 11-12-06, 11:26 PM

Welcome to the forum spian.

The motor is fitted to a mount that adjusts the elevation as it traverses. If you have a look at some of the pictures on the forum you will see that the motor is built on a bent arm.

spian · 12-12-06, 08:12 PM

Thanks Jim, guess thats why its so important to line up with due south first.

BGonaSTICK · 12-12-06, 09:17 PM

It's the declination angle that causes the dish to travel in an arc.

If you have a look at this elevation/declination chart, you'll see that at a latitude of 0 degrees, i.e. at the equator, the declination angle is zero and the elevation of the dish is 90 degrees.

That is, the dish is pointing vertically into the sky, and it's not tracking an arc, but a perfectly straight line. Even a DiSEqC motor with a bent output shaft will track a straight line if set up correctly at the equator.

The further North (or South) you go, so the declination increases and the arc becomes more pronounced.

Sorry, but you did ask! :roflmao:

11-12-06, 11:19 PM	#1 (permalink)
spian Junior Member Join Date: Dec 2006 Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts	Is Dish elevation worth considering I'm just about to venture into the world of Sat Tv and have decided to opt for a motorised system but as I understand the motor only moves across the horizon, yet most satellites are at different elevations also. Does this mean that the difference in the elevation are not worth considering or is it only cheap motors that move in one direction:?

11-12-06, 11:26 PM	#2 (permalink)
Jimdefruit Super Moderator Join Date: Jan 2006 Posts: 2,858 Thanks: 20 Thanked 221 Times in 187 Posts	Re: Is Dish elevation worth considering Welcome to the forum spian. The motor is fitted to a mount that adjusts the elevation as it traverses. If you have a look at some of the pictures on the forum you will see that the motor is built on a bent arm. __________________ Dreambox 800 HD; Dreambox 7000s + VBox + Channel Master 1.2 with 36v actuator CM120 feedhorn and Invacom .3 LNB Skystar 2 PCI card with links to my Dreamboxes If you like what you see here, tell your friends.

12-12-06, 08:12 PM	#3 (permalink)
spian Junior Member Join Date: Dec 2006 Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts	Re: Is Dish elevation worth considering Thanks Jim, guess thats why its so important to line up with due south first.

12-12-06, 09:17 PM	#4 (permalink)
BGonaSTICK Dodgy Geezer Join Date: Nov 2005 Location: Brighton Posts: 9,718 Thanks: 3 Thanked 166 Times in 60 Posts	Re: Is Dish elevation worth considering It's the declination angle that causes the dish to travel in an arc. If you have a look at this elevation/declination chart, you'll see that at a latitude of 0 degrees, i.e. at the equator, the declination angle is zero and the elevation of the dish is 90 degrees. That is, the dish is pointing vertically into the sky, and it's not tracking an arc, but a perfectly straight line. Even a DiSEqC motor with a bent output shaft will track a straight line if set up correctly at the equator. The further North (or South) you go, so the declination increases and the arc becomes more pronounced. Sorry, but you did ask! :roflmao: __________________ Dreambox 7000, Skystar2 PCI, Skystar USB, Fibo 90cm on Moteck SG2100, Triax TD110 multi-LNB. Sky + ART cards. 45.0°E - 58.0°W