Moteck SG-2100 Declination Angle?

[satelliteman]

An explanation of motor polar axis angle, declination offset angle and dish elevation setting for H-H DiSEqC Motor - Theory.

Example: Moteck DiSEqC Motor SG2100A
Site Latitude of 52 Degrees


Polar axis angle calculation will be: 90 – 38 = 52, so scale on the fixed bracket set to 52 or elevation scale on other side to 38 (90 - 52 = 38). Dish elevation calculation – first find the declination offset angle, in this case 7.5° (which is the declination angle for a latitude of 52 degrees) so 30 (angle of this motor shaft bend relative to the main polar axis) minus 7.5° = 22.5, therefore 22.5° is the angle you should set on the dish scale as a starting point for your due South satellite.


Other manufactured DiSEqC motors may have the stub arm cranked forward by various angles, including for example 40 and 46.5 degrees.


It should also be noted that some dish elevation brackets are not that accurate and above is for info only as a rough starting point. Once the dish has been set up with an alignment meter on your due South satellite, the declination offset would have already been made and will be near enough correct for tracking the arc

[zulu7777]

Hi I would like to thank you very much for the fast comments and very helpfull tips.
Before I tried the moteck I had a stabb motor wich I used for the last 4 years when it decided not to turn any more!!
Yes the pole and dish remail the same and with the stab not moving I aimed for the hispasat 30W cause I like spanish, and within 30 seconds I would adjust for best signal. manually, but with the moteck I never saw it again.
Yesterday I mounted the old stab motor stuck at almost 40 deg. and again manually found the hispasat at 80% signal strenght!!
So the pole and dish are ok. When the motor [moteck] comes in the west the sat become very critical and at 30 deg for hispasat no signal at all. I think that the arc that the motor makes is not perfect, at least thats what I think. Thanks again for helping ,

mario. THANKS RICK AND YORKS

[Robbo]

The motor is fine. You have not got it setup correctly. When changing from a stab to a Moteck, the dish elevation (declination) will need changing.

You really need to read them guides.

[Rick]

Yep, I think Robbo has hit the nail on the head, when you change to motor to a differant type, you need to realign the dish again.

[zulu7777]

Hi
First of all I would like to thank you for your fast reply from Rick and Yorks.
Before I purchesed this motor I used to work with a STAB motor, which I used for almost four years, when it decided not to turn any more. Before a week ago I had set the dish on HISPASAT with theold motor stuck on almost 40 deg but manage to manualy find HISPASAT with a signal of 80%, so the dish and pipe are good cause I used them for the last 4 years.
Now with the moteck motor 2100A I never recieved hispasat and not even 1W as u told me to try not even 7E, and with good signal for hotbird and astra. I also recieved signal from 5E.
I tried again yesterday the stab an find HISPASAT in a minute with good signal.
I am thinking that the motek motor don t have a good arc when rotating.

I would like to thank you for your HELP,

MARIO.

[zulu7777]

ROBBO you mean the DISH itself?
can u explain a little bit in detail !!
thanks again.

[Robbo]

As I said before, you need to read those guides, then you would understand why it won't work, and will know how to fix it.


But basically as mentioned by satelliteman, different motors have the motor shaft bent by a different angle. The bend is merely to enable an offset dish to have the adjustment range needed.

But, different angle of bend means different adjustment on the dish scale.

Set the motor to your latitude, send the motor to your nearest due south using USALS, and adjust the dish (tilt) for best signal. Look at satellitemans guide if you can't be bothered to read one of the long ones, and you will have your system working in no time at all.

[zulu7777]

Thanks robbo for the nice help and suggestions. No i did not touch the dish itself.
Will give it a try this morning, and let u know

thanks to all.... Mario