Korean TVVarious discussions about Korean TV satellites, transponders, frequencies, updates, news, etc.
여기서 무료로 한국 위성방송에 관한 정보를 서로 교환 할수 있읍니다.
한국 무료 위성 방송 설치 요령, 새로운 정보, 뉴스 그리고 기계 설치 방법등...
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I have noticed that nearly all of the H-H type motors have the dish mounting shaft either bent or offset from the actual axis of rotation at about a 30 degree angle.
Can someone please explain the reason for this bend or angle and how it is used in creating the proper arc to accurately track the Clarke Belt satallites?
Because the arc in the sky is what would look like the curve of a "rainbow", with the arm bent it takes care of the creation of that arc as it rotates. If it rotated straight side to side, the elevation would need to change.
And at the same time, ends up tilting the dish to the correct skew so the LNB is set at the right polarization angle.
At first glance, that would appear to be the logical explanation. However, different manufacturers/models use different shaft angles and the mounting distance of the dish from the end of the bent shaft is never specified.
The mounting point can significantly affect the amount of offset produced by the angled shaft as it rotates.
I have Googled until I am sick of reading and still haven't found any discussion about the shaft angle.
I disagee that the mounting point on the shaft affects the rotational angle.
Imagine a shaft with 10 foot long mounting area (after the bend).
Would 3 dishs along the straight length point to different satellites?
I don't think so.
OK so you are looking for more than the "newbie" explanation on how the angles are calculated.
I'm sure there's some type of formula used (as evidenced by the P-60 - LAT stuff) for the motors. I suppose I could figure it out if I thought about it long enough, but why re-invent the wheel? Just information gathering?
Imagine a shaft with 10 foot long mounting area (after the bend).
Would 3 dishs along the straight length point to different satellites?
I don't think so.
I agree. If all 3 were aligned the same, they would track the same.
Now, add the 4 dish to the deal and attach it to the shaft before the bend and aim it the same as the other 3. Would it not also track the same as the 3 on the bent part?
I was using the 10 foot shaft that you asked me to imagine, but I am unable to locate the imaginary manufacturer's specifications at the moment.
The "imaginary manufactures specs" are real install instructions included with every motor sold. There are some links to PDF's on Sadouns sales site for them.
As I sense your response as a bit of sarcasm, this will be the last post from me on this thread.
Sarcasm or not, I was using the imaginary example "you" suggested and not a real HH motor. I did not intend to "shaft" :roll: you, just to continue to build on your excellent example.
I have yet to find anywhere any convincing documentation where it shows that the bending of the shaft has any effect on how the arc tracks.
It appears that the bend is only to provide for mechanical clearance and to restore the motor shaft to an angle that is closer to plumb than a straight shaft.
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