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bousouzoku

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Reply with quote  #1 
What is the correct orientation when installing the ADL Precision C/Ku type feedhorn? Should I align the servo motor with the polar axis like the arrows show on my models servo motor? Or should it be installed more like a Chaparral Corotor with servo motor not inline with the polar axis and around 11 o’clock ? I currently have it inline with the polar axis.

I'm not familiar with the ADL feedhorns or even this particular servo motor since I have only used the Corotor in the past. My skew appears to be off as I had to compensate a large amount during my initial tune even though that might have not been the only issue. I would like to know for sure the correct orientation of my feedhorn type to have a solid base to adjust from.

Thank you
20181004_174110.jpg  20181004_174136.jpg

Johnny_Fever

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Reply with quote  #2 
I just saw this post and was wondering how you made out with the ADL. I had one of these in a storage tub and dug it out last fall to try on a couple of different dishes. I had the best result at 1 o'clock. At 11 o'clock I still had satellites where it seemed that to servo hit the end spot and I couldn't tune in both polarities successfully.
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Michigan state. 12' Paraclypse rescue & restoration.
Octagon, Linkbox, Icecrypt, Geosat Pro, Motorola digicipher.

bousouzoku

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Reply with quote  #3 
Johhny_Fever, thank you for responding to my post. I should have updated what my problem was and how I fixed it. I will do that now as the problem I experienced resulted in a lot of wasted time, missed satellite feeds, and countless trips back on the roof.

The whole time my problem was not the  feed assembly or the skew at all. It was my own inexperience, lack of knowledge, and poor troubleshooting ability at the time. I have previously installed C/Ku-Band satellite systems in the past (almost a decade ago) and had good results. A 7.5 for starters, and my favorite, a 12 footer. This time around, I felt like I had never touched one before... ha ha

Using one of those cheap satellite finders was how I always got started finding the arc. This time, I was able to find a signal right away. The finder showed full strength. I must be good! Or so I thought...
 
Elevation and declination were to spec for my area as well as the north /south axis, why can't I lock onto a known transponder for my due south... Defective signal finder I thought... So I got another one. Same result, satellite finder pegged out to the max and lowering the db setting changed nothing.

The instructional notes for the satellite finder said "To avoid a continuous full scale reading, do not use the Satellite Finder directly in front of the dish." I was never in front of the dish, but still had the issue with the full scale reading...

I kept spinning my wheels on this for a while...I then purchased a real signal meter from Rick. The SATHERO SH-900HD, awesome meter by the way. I thought having a more accurate and comprehensive tool would help... It helped immensely, but only after I found the real problem.
 
 I ended up finally disconnecting the C-band LNB from the meter and then connected the Ku LNB to the meter. I was spot on the arc the entire time... Scanned in the CCTV channels on 95 W Ku and was back in business tracking the way it should be. 
 
I just had a bad C-band LNB the whole time. That's what was causing all the erroneous and strange readings on the sat finders and lack of transponder acquisition on the receivers. And I thought it had something to do with the skew... silly me. 
 
Next, I decided to go back to the Chaparral Co-rotor system with a fresh set of modern LNBs for good measure. The ADL is a nice feed horn, but I like having the f/d ratio marked on the side of the feed as well as the instructions indicating where to measure the focal length to. The ADL appears to have more of an adjustment range for the f/d ratio compared to the Co-rotor.  I was not able to find any documentation on the ADL feed. I'm sure there was ways to measure everything, I guess I just wanted a fresh start with documented measurements.

I never did try to adjust the position of the ADL feed horn in relation to the polar axis. Being straight up and down with the arrows like I had it was just fine. The probe only has to move 90 degrees once aligned with the incoming microwave on the selected polarity, so even if a person is off on the alignment in relation to the polar axis a little bit at the dish, there is some compensation with the electro-mechanical skew adjustment for the most part. This can be verified by the performance of the dish, and even more accurately and efficiently with a spectrum analyzer. I love a good spectrum analyzer, seeing is believing...That will come in handy when I upgrade to an orthomode system.

It all comes down to system fundamentals of operation and adjustments. Taking a step back, reading, researching, and so forth. I'm glad I struggled for a while. I learned much more that way and gained a greater understanding of this awesome hobby. Plenty more to learn still, and plenty of time to do so...
 
 
Johnny_Fever

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Reply with quote  #4 
I really enjoyed reading your update B. I'm relatively new to the hobby but I watched my Dad fiddling around with dishes the whole time I was growing up. The ADL I tried out was his feed of choice. I remember it being a difficult feedhorn to set the f/d on. I remember that for years Dad had Ku problems and blamed the ADL. As it turned out the Chapparal LNB that was packaged with the feed was the culprit. Replacing it with a new Norsat cleared everything up. But I do remember that the dual feedhorn cut his C band signal down considerably. So for a long time we only had a C band feed and a good quality LNB on his main dish with excellent results.
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Michigan state. 12' Paraclypse rescue & restoration.
Octagon, Linkbox, Icecrypt, Geosat Pro, Motorola digicipher.

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Fellow Members, your posts are welcome here! Do not worry about posting everything perfect. Different receivers and LNB's will give you different Frequencies and Symbol Rates. Some set top boxes, PCI cards and USB receivers, Do Not Require all of the same information that others may need. It is not Required to post everything that others may need to tune in a feed. It is just most important to share the find. We can always adjust the Frequency and Symbol Rates and try the various Modulations and FEC's on our own receivers until we get a lock and then give a polite reply with what works for your receiver, as that information might help others as well. We all appreciate the efforts and energy of the Posters!

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