Aligning Atlantic side of h-h dish

[Brct203]

about receiving Circular on a Linear setup, i want to point out that yes, many circular transponders will be receivable at the cost of a small power loss, but only if they don't interfere with signal on the opposite polarity

For example if there's a transponder on 3840 L that is 20MHz wide, and nothing on Right-hand polarization between 3830 and 3850, it should be fine on a linear LNBF. But if there's something in that range on the Right-hand polarity, they will get mixed up in the linear feed, and usually will result in no reception.

On 47.5W we can get good reception with a linear feed, but on 40.5W, only a limited number of channels will be received with a linear feed compared to what is available with a circular feed.

The same is true on the DBS (Dish Network and Bell) satellites that use circular, most transponders overlap between L and R and with a linear LNBF we usually get nothing or just a few of them, compared to what we can get with a circular feed.

 

[Vintagesports]

Just realized this past weekend that my problem is that the worm gear is having some play with the half moon. Backlash is what is called. The arc is aligned correctly as I am able to catch from 135W to 55.5W with no problem but signal in 45W is weak and hardly no transponders in 43.1W
I push the dish upwards and it has some play in it and the signal quality increases to 70%. I let it go and it goes down to 0. The play is significant enough so as to reduce the signal from 70 to 0.
Is there a way to fix this gear backlash without disassembling the mount?


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[Magic Static]

Backlash on the final drive is not the problem. That would not take you off the arc. It would make it so you would have to move east or west a click or two to get on signal. You may have play in the main shaft, but it sounds like declination error.

 

[Vintagesports]

Backlash on the final drive is not the problem. That would not take you off the arc. It would make it so you would have to move east or west a click or two to get on signal. You may have play in the main shaft, but it sounds like declination error.

Thank you Magic Static
Will tightening the back screw correct any play in the main shaft?


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[Magic Static]

Thank you Magic Static
Will tightening the back screw correct any play in the main shaft?


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No it shouldn't. The one I have is loose also but I can only see to 55.5°W ~ 139°W and never really had a problem with it except when it gets windy. The wind can lift up on the dish because of the looseness and cause signal loss for me. I thought about trying to repair it but it might be easier to replace it. I've been working on getting an unused AJAK.

 

[Vintagesports]

No it shouldn't. The one I have is loose also but I can only see to 55.5°W ~ 139°W and never really had a problem with it except when it gets windy. The wind can lift up on the dish because of the looseness and cause signal loss for me. I thought about trying to repair it but it might be easier to replace it. I've been working on getting an unused AJAK.

Would be a jackpot if you are able to get an unused one. Wish you luck!!


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[mmewrench]

I know I am a bit late joining this thread, but I think the problem here lies in the fact that the azimuth is set too far west and the elevation is too high.

 

[mmewrench]

Aside from making sure the dish is assembled accurately there are only three adjustments to make. Declination: I set this first. Measure as best you can and set it and forget it. Don't need to touch it again. Set elevation at due south. The dish in the middle of the arc. Finally move the dish to a sat just above the horizon, east or west. Adjust the azimuth for best signal. Move back to center and double check elevation.
Any thing you do to adjust the east side affects the west side. So if the east isn't aligned the west isn't either.

Taking this a step further, Try peaking the dish on each satellite east of your azimuth one at a time. after you make adjustments on the east side, go back to the west an equal distance from zenith and check your signal(quality). Once you are balanced on both sides, check your zenith again. If quality has dropped then lower your declination slightly. In theory if you are peaked on the arc. you should be able to hit 3w if you are in thefootprint as well as 135w. This worked for me on my ancient 12 ft dish (ku also).