72w Ku in different position than 72w C band

[truckracer]

Do I have an alignment issue or f/d issue?
The other sats are right on. If I peak the dish position and Skew on the other hybrid satellites its not a problem.

 

[FaT Air]

Heard of this before and, at least to me, it couldn't be a problem with the dish, FL, or FD. Think it would affect all satellites if that were the case. IMHO it would most likely be adjacent interference.

 

[phlatwound]

...IMHO it would most likely be adjacent interference.

That is the only thing that makes sense to me also.

 

[truckracer]

10' dish with corotor

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[Lone Gunman]

I have a couple of hybrids that occasionally do the same thing. I was thinking that they may be moving around "in the box" and causing it but I guess adjacent sat interference could do it as well.

Things that make you go hummm...................

 

[skysurfer]

Do I have an alignment issue or f/d issue?
The other sats are right on. If I peak the dish position and Skew on the other hybrid satellites its not a problem.

I would guess you thought you were peaked up on c-band and then when you went to Ku-band, you had to adjust your dish position a click or two.

Ku-band has tighter aiming tolerances than c-band, so it's best to align your dish and store your positions using Ku-band on those satellites that have c and ku band transmissions from the same physical satellite.

 

[truckracer]

C band on 72 disappears when I peak on ku

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[Lone Gunman]

C band on 72 disappears when I peak on ku

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You'll have to do like I do on this then, ie, assign different position numbers for C and Ku at nearly the same location. I've got several programmed in that way. Most of the problems I see are only about 4/6 clicks off but it does make a difference especially on my Unimesh as it's not tuned in quite as good as the Winegard. Some Ku sat locations on that dish are only 3 clicks wide, which is really narrow compared to the Winegard which is about double that.

And speaking of fine tuning, I took some measurements off that Umimesh dish last week from the feed horn throat to the edge of the dish and it's about 1.5" off? I'm looking into changing out that button hook and making 4 mounting arms for it like the ones on the Winegard dish. Once I get a laser alignment mount made for the feedhorn throat on the DMX LNBF I'm going to try to do that using 1/2" EMT.

 

[truckracer]

Sounds like a good plan. I am sure mine needs peaked and tuned after this winter.


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[Cham]

Mine is in the same boat too, 50mph winds yesterday most of the day and overnight, now signals have dropped considerably on almost all sats. Hope my mount isn't bent or distorted from all that pressure...
Forecasting another storm for Monday, same winds only from the opposite direction so the dish is protected by the trees behind. 6-10" more snow!

This has been a really rough season!

 

[primestar31]

C band on 72 disappears when I peak on ku

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Are you sure your scalar plate and lnb is parallel to the dish, and properly centered? If not, that can cause this issue.

 

[truckracer]

I bet it's not now . Heavy ice and snow all winter.


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[FaT Air]

Are you sure your scalar plate and lnb is parallel to the dish, and properly centered? If not, that can cause this issue.

Think that would effect ALL satellites, not just one.

 

[primestar31]

Think that would effect ALL satellites, not just one.

Not necessarily, as just a few little problems here and there with things shifting on a dish can add up into a bigger error for a particular sat or two.

Everything is supposition anyway until you fix it and know for sure...

 

[truckracer]

Figured out my problem. Feed arm was rusted and water froze splitting it open and distorting the centering of the feed. I made new arms out of 1/2" emt conduit. Flattened the ends Andrade them the same length.

Life is good and c and ku are in the same spot.


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[FaT Air]

Good to hear. :up

 

[truckracer]

Drilled them. Not sure what autocorrect was trying to say.


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[truckracer]

new arms I made from emt conduit


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[truckracer]

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[truckracer]

Drilled holes in bottoms to prevent rain buildup an freezing damage.


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