Declination - Techwatch Support Forums: Digital & Satellite TV, FTA, Cable, Computers, Mobile Phones, Apple and General Tech Forums

knighthawk2 · 30-11-06, 03:26 AM

Hi again, its me still having problems.
I,ve read and re-read your great guide "Installing a satellite Horizon to Horizon DiSEqC motor the right way"
Could someone please confirm 1 thing for me, here goes.
My Latitude is 51N so my Elevation angle (of the motor) is 39 degrees.
My Declination is then 7.385, on the side of my dish is a bracket with 25-45 degrees marked on it.
Does that mean set the angle of the dish bracket to 39degrees minus 7.385degrees equalling an angle of 31.61degrees thereby having the dish pointing 7.385degrees lower than the motor angle.
It seemed obvious when I read it but now I'm not so sure.
Sorry to be a pain but I do appreciate the advice.
Many thanks again.
Ian

BGonaSTICK · 30-11-06, 02:11 PM

You just need to set the motor elevation angle to 39 degrees.

For the dish angle, you need to refer to the motor manual. Motors vary, depending on the design. Whilst your declination angle is fixed, the maths to calculate what the dish scale should read vary slightly between manufacturers.

The Moteck motor for example requires the dish scale to be set to 40 degrees - your declination angle of 7.385

i.e. 40 - 7.385 = 32.615 degrees.

If you don't have a Moteck motor, you'll have to look up the equivalent calculation in your motor manual.

Of course this is just your starting point. Hopefully this will give you some reception, but then you must fine tune it to get the best physical results.

HTH

STICK

knighthawk2 · 30-11-06, 02:45 PM

Cheers for that, at least I know that the idea is correct.
I was unsure because my motor manual states the dish scale should be 30degrees.
Therefore 30 - 7.385 = 22.61 which seemed odd as my dish scale only goes down to 25 degrees.
Good job I'm on holiday for two weeks, looks like I'll need it :

Many thanks

Ian

BGonaSTICK · 30-11-06, 05:20 PM

LOL. At the end of the day, you can tie yourself up in knots over the numbers, but as long as you:

[#] Have your mast mounted dead plumb

[#] Set the motor elevation spot on and then leave it alone

[#] Align the dish on the motor centrally

[#] Follow the manual to set the motor/dish up on due south, and then make a correction to the nearest useful satellite (usually Thor in the UK)

...the declination setting effectively just gets you somewhere near where you need to be to find something with your meter.

Minor adjustments come later, and can take 40 years to get exactly how you want them

30-11-06, 03:26 AM	#1 (permalink)
knighthawk2 Junior Member Join Date: Nov 2006 Posts: 16 Thanks: 0 Thanked 0 Times in 0 Posts	Declination Hi again, its me still having problems. I,ve read and re-read your great guide "Installing a satellite Horizon to Horizon DiSEqC motor the right way" Could someone please confirm 1 thing for me, here goes. My Latitude is 51N so my Elevation angle (of the motor) is 39 degrees. My Declination is then 7.385, on the side of my dish is a bracket with 25-45 degrees marked on it. Does that mean set the angle of the dish bracket to 39degrees minus 7.385degrees equalling an angle of 31.61degrees thereby having the dish pointing 7.385degrees lower than the motor angle. It seemed obvious when I read it but now I'm not so sure. Sorry to be a pain but I do appreciate the advice. Many thanks again. Ian

30-11-06, 02:11 PM	#2 (permalink)
BGonaSTICK Dodgy Geezer Join Date: Nov 2005 Location: Brighton Posts: 9,718 Thanks: 3 Thanked 166 Times in 60 Posts	Re: Declination You just need to set the motor elevation angle to 39 degrees. For the dish angle, you need to refer to the motor manual. Motors vary, depending on the design. Whilst your declination angle is fixed, the maths to calculate what the dish scale should read vary slightly between manufacturers. The Moteck motor for example requires the dish scale to be set to 40 degrees - your declination angle of 7.385 i.e. 40 - 7.385 = 32.615 degrees. If you don't have a Moteck motor, you'll have to look up the equivalent calculation in your motor manual. Of course this is just your starting point. Hopefully this will give you some reception, but then you must fine tune it to get the best physical results. HTH STICK __________________ Dreambox 7000, Skystar2 PCI, Skystar USB, Fibo 90cm on Moteck SG2100, Triax TD110 multi-LNB. Sky + ART cards. 45.0°E - 58.0°W

30-11-06, 02:45 PM	#3 (permalink)
knighthawk2 Junior Member Join Date: Nov 2006 Posts: 16 Thanks: 0 Thanked 0 Times in 0 Posts	Re: Declination Cheers for that, at least I know that the idea is correct. I was unsure because my motor manual states the dish scale should be 30degrees. Therefore 30 - 7.385 = 22.61 which seemed odd as my dish scale only goes down to 25 degrees. Good job I'm on holiday for two weeks, looks like I'll need it : Many thanks Ian

30-11-06, 05:20 PM	#4 (permalink)
BGonaSTICK Dodgy Geezer Join Date: Nov 2005 Location: Brighton Posts: 9,718 Thanks: 3 Thanked 166 Times in 60 Posts	Re: Declination LOL. At the end of the day, you can tie yourself up in knots over the numbers, but as long as you: [#] Have your mast mounted dead plumb [#] Set the motor elevation spot on and then leave it alone [#] Align the dish on the motor centrally [#] Follow the manual to set the motor/dish up on due south, and then make a correction to the nearest useful satellite (usually Thor in the UK) ...the declination setting effectively just gets you somewhere near where you need to be to find something with your meter. Minor adjustments come later, and can take 40 years to get exactly how you want them __________________ Dreambox 7000, Skystar2 PCI, Skystar USB, Fibo 90cm on Moteck SG2100, Triax TD110 multi-LNB. Sky + ART cards. 45.0°E - 58.0°W