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jdcpa

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Reply with quote  #46 
Isn't this complicated by satellite locations being in a box maybe more than 100 miles tall or deep, with possibly the southernmost and/or endpoints being on a box edge rather than somewhere near center? [frown] IME, on any given day, optimal tracking might be quite a bit different than some other day. It plays into why I'm so happy I opted for 12' instead of the customary 10' here when I got started over 30 years ago.
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Hurricanes Hermine and Irma 28N paths. C Norsats: 8115 on Corotor II on 10' mesh; 5215G5 X2 on Bullseye I on 12' mesh.
rikoski

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Reply with quote  #47 
"It plays into why I'm so happy I opted for 12' instead of the customary 10' here when I got started over 30 years ago." Really? Isn't the focus more precise, rather than wider,  with a larger diameter reflector?
jdcpa

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Reply with quote  #48 
Quote:
Originally Posted by rikoski
Isn't the focus more precise, rather than wider,  with a larger diameter reflector?
Sure, but it obviously pays off. Thunderstorm washout on my 10' obviously starts sooner and ends later than on my 12'. Equinoxal solar outages are shorter too.

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Hurricanes Hermine and Irma 28N paths. C Norsats: 8115 on Corotor II on 10' mesh; 5215G5 X2 on Bullseye I on 12' mesh.
rikoski

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Reply with quote  #49 
This is true only if you have a stable and steady mount and mast; have taken the time to set the focus and aim the the the dish properly; have a reflector which is precisely parabolic; and am willing to adjust the azimuth for each satellite as needed. If you don't need the extra gain, you might be better off with a smaller dish because you won't have to spend as much time fiddling with the dish. On the other hand since you have gone to the 12' dish already, you might want to add an azjimuth actuator to simplify your adjustments.

a33

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Reply with quote  #50 
Quote:
Originally Posted by a33
One can reason exactly the other way round: set the rotation axis elevation very precise, and then fineadjust with declination.
If the elevation angle is set very exact, that would imply that the declination fineadjustment should be in a range of the above mentioned .05 degrees.
So in theory that would work also.


Come to think of it:
This might well be quite common practice for setting up motorized offset Ku-Band dishes here in my country.
As the exact offset angle of dishes is often not known, and the elevation scale for the dish is often not very accurate, it is hard to set a precise declination angle. So one first sets the motor axis elevation, and then "fine"adjusts the dish declination.

Thankfully, the dishes often are relatively small (smaller than 1 meter) and (due to the relatively bigger opening angle) rather forgiving for misalignment.


My 'ideal' motorsetup procedure would be:
1. Check the pole is exactly plumb.
2. Check and calculate the offset angle of the dish. And check that LNB-feedhorn phase center is mounted at that offset angle (not always obvious!).
If that is the case, you can use the dish face as anchor line for exact angle measures.
3. Set the dish to the (calculated) modified declination angle for your Latitude, and set the rotation axis to the matching (calculated) modified elevation angle.
4. Maybe, a little bit fineadjustment would still be needed for a hard to get satellite. I'd do that by fineadjusting the axis elevation.

Alas, with my Triax-115 point 2 already formed a problem. Though I set it all up provisionally last year, I'll have to change arm/LNBholder to set the LNB in the right spot (a little higher, and further from the dish than the arm was made for). Hope to do that this year...


Greetz,
A33
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