always a few degrees off

dss_diehard · #1 (**permalink**) 09-10-2004, 12:44 PM

Hi all,

I'm just starting out and been reading and searching. I have a question that's not been answered yet. I just got a SM3D12 type motor (H2H from Microyal). While testing it on my desk I noticed that it always goes like 3 degrees off from where it supposed to stop (I'm using VisionDTV from Twinhan). I input my latitude and longitude using USALS and press goto a certain satellite and according to the tick marks next to the tube it's always approx. 3 degrees off when it stops and in the same direction. Will it need a reset? Am I doing something wrong? I like to get this sorted out before going up on the roof. Thanks.

rckowal · #2 (**permalink**) 09-10-2004, 09:15 PM

Dss_diehard,

This sounds like your local coordinate settings may be off. Double check them using a sat finder utility. There are a lot of them available on the web. And make sure you "Store" or "Save", or whatever your receiver calls it, after entering or changing the coordinates.

Not familiar with the card you use but it should have a "Got to reference" or "Reference" command of some sort. This should make the motor rotate to zero on the motor scale.

You can reset the processor in a SM3D12 motor (see Microroyal manual) by disconnecting the coax from the receiver while the power is on (yellow LED on motor is lit). Then shut power down the computer/card & reconnect the coax. Then power up. The motor should rotate to the eastern most limit & auto reverse its rotation to go back & stop at zero on motor scale. This simulates a power outage in which case the motor loses its reference position so it doesn't know where it is. When it goes to east limit it restores its reference position.

If this doesn't work then I suspect you could have a faulty motor or there is something in the card that causes this position error.

Also read this link. http://sadoun.com/Forum/phpBB2/viewt...1b7df 489b25c

Good luck

dss_diehard · #3 (**permalink**) 09-10-2004, 09:41 PM

Thank you thank you thank you for replying.

Ok, I'll check out your suggestions.

In the mean time, I forgot to mention that I'm using Twinhan's VP1020A card and starting out with VisionDTV 2.42.1 (which is I guess the newest release) in case anyone else wants a stab at this.

Also I'm only guessing that it's wrong as I haven't actually mounted and tested it yet. Just for fun lets say I want to goto Directv's old sat at 101 and I'm at 75 it should stop at 26 but it always stops at approx. 24 or 29 can't remember as i'm not in front of the setup now. Do I even make sense?

rckowal · #4 (**permalink**) 09-10-2004, 09:54 PM

Yes you make sense. However, now that you explained it in greater detail, I don't think there's anything wrong. The "Prox." 3 degree difference you're seeing is something called declination.

You need to multiply the difference in degrees by 1.15 to acount for it. So 26 x 1.15 = 29.9. Sounds to me like your motor setup is ok.

Quote:

Originally Posted by dss_diehard

Thank you thank you thank you for replying.

Ok, I'll check out your suggestions.

In the mean time, I forgot to mention that I'm using Twinhan's VP1020A card and starting out with VisionDTV 2.42.1 (which is I guess the newest release) in case anyone else wants a stab at this.

Also I'm only guessing that it's wrong as I haven't actually mounted and tested it yet. Just for fun lets say I want to goto Directv's old sat at 101 and I'm at 75 it should stop at 26 but it always stops at approx. 24 or 29 can't remember as i'm not in front of the setup now. Do I even make sense?

dss_diehard · #5 (**permalink**) 09-11-2004, 05:39 PM

Thanks again.

I 'll just throw the whole thing up there and see how it all goes. Will post back within a week.