Ariza AT 120 cm dish focusing poorly (1 Viewer)

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polgyver

Creative Tinkerer
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Sep 21, 2010
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A few weeks ago I bought through Kijiji an used 4 foot Ariza dish - the price was $ 80, and an actuator 36 V 36" was included. The seller claimed that the dish was not installed, just stored in the basement.
I looked for such a dish for long time, planning to receive (finally!) some programs from C-band.
When installed, this dish was worse than my 36" no-name dish.
Annotated pictures will tell more:
IMG_1088.JPG IMG_1090.JPG IMG_1096.JPG IMG_1097.JPG IMG_1098.JPG IMG_1156.JPG IMG_1162.JPG IMG_1163.JPG IMG_1164.JPG IMG_1165.JPG IMG_1166.JPG IMG_1226.JPG IMG_1229.JPG

Any other methods/tricks for re-shaping a dish?
 
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Cham

VE4GLS
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Dec 19, 2008
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I have a 1.2 fortec star dish that focuses poorly as well. It seemed to help to move (support) the LNB arm up a bit by using a string that I ran up though a hole at the top of the dish then down to the mount assembly at the back. This improved the signals quite a bit. Seemes the dish itself was too thin and weak to support the LNB arm even with the support rods. Adding the string likely causes distortion to the parabola as well but by better positioning of the feed point and removing some of the load from the support arm maybe it actually lessens the distortion.

I believe the Ariza dishes are built a bit heavier, but maybe has the same issue?

I have a picture of my dish mod somewhere, will try to find it. 97mount1.jpg This shows where the string ties to the LNB arm...
 

Conky

SatelliteGuys Pro
Aug 22, 2008
430
54
SW Ontario
I'm guessing the guy might have had a little 'accident' with the dish(thus the low price) or maybe it was just bad quality to begin with.

Did you try string testing it or laying it face down on the ground? any dents? I wonder if squeezing it horizontally would improve anything . The threaded rod braces might be the best solution as any attempt to reshape the dish with something like an English wheel might make it worse
 

polgyver

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Sep 21, 2010
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Thank you, Cham and Conky, for sharing your opinions. Most likely, Ariza is also thin and flabby like Fortec Star. Running extra supporting string, especially to 1-2 o'clock area, definitely worth trying.
I did string test of the dish, twice : on the mast and the "bowl" only, horizontally. The results are puzzling, as one contradicts the other.
I did not include these pictures in my first post, as it would be too many.
Also I forgot one picture showing less S/Q in the first post, so it will be shown here.
IMG_1230.JPG IMG_1171.JPG IMG_1175.JPG IMG_1188.JPG IMG_1193.JPG IMG_1197.JPG
 

jorgek

SatelliteGuys Pro
Mar 11, 2013
1,214
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Near Toronto
As usual you have gone to great lengths to test and seup the dish. From the enclosed pics, especially the bracket holding the dish to the mast appears flimsy and undersized. I'm not surprised that the dish is out of round. Is that a typical bracket for a 4 ft dish?
 

Cham

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Dec 19, 2008
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Looks exactly like the fortec star dish I have.
There are better dishes available, the GeosatPro models have good reviews...
 
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polgyver

Creative Tinkerer
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Sep 21, 2010
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As usual you have gone to great lengths to test and seup the dish. From the enclosed pics, especially the bracket holding the dish to the mast appears flimsy and undersized. I'm not surprised that the dish is out of round. Is that a typical bracket for a 4 ft dish?
True, everything feels flimsy and fragile. The sheet metal has the same thickness as in Raven (wild blue) dish, which is only 20" x 28".
IMG_1260.JPG
 

polgyver

Creative Tinkerer
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Sep 21, 2010
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I corrected my Fortec 1.2 using 2 turnbuckles and some metal strapping. My old post is here:
http://www.satelliteguys.us/threads/310482-Another-Fortec-1-2-mod?p=3161923#post3161923

I have a separate ku and C LNB on this dish and it works great.
Your solution surely qualifies for praise from Don Lancaster (www.tinaja.com), who advocates so called "elegant simplicity".
Tried to do something similar, it happened I got some tubing lying around.
Just trying to bring the focal cloud to the smallest and most round shape.
Did not try receiver with meter yet.
IMG_1245.JPG IMG_1244.JPG IMG_1249.JPG IMG_1248.JPG IMG_1251.JPG IMG_1250.JPG IMG_1255.JPG IMG_1254.JPG IMG_1256.JPG IMG_1259.JPG
 

Titanium

AI6US
Lifetime Supporter
May 23, 2013
7,324
8,392
Meadow Vista, Northern California
Surprised that there are any 1.2 Ariza dishes left! Ariza and there other DBAs were not known for being associated with quality, durability or reliability. They were all about cheap below market prices and turning a quick STB deal for the "clone of the month". Their companies seemed to be endlessly involved and associated with numerous legal problems. Google David Fuss / Ariza for some interesting reading...

Looks like a black cloud continues to follow: http://www.davis.ca/en/entry/litigation/unlawful-conduct-conspiracy-hsbc-bank-canada-v-fuss/

Ah, memories..... http://www.satelliteguys.us/threads/132792-Major-Free-to-air-Dealer-Raided-In-Canada :D
 

FaT Air

HOA Free Zone
Feb 27, 2010
6,668
914
97W 48N
Another simple elegant solution.
How much did you have to pull those points back?
(Don't think you'd gain much more by finding, and fixing, where that 'ding' is)
 

polgyver

Creative Tinkerer
Pub Member / Supporter
Sep 21, 2010
466
321
Toronto
Another simple elegant solution.
How much did you have to pull those points back?
(Don't think you'd gain much more by finding, and fixing, where that 'ding' is)
On the West edge, the turnbuckle was turned 4 times - it pulled the edge about 1/4".
East edge - 3 turns, pulled the edge about 3/16".
Probably the rectangular tubing also gave in a little, I have to check it with another straight bar.
But recently I got this idea to abandon the 3 member LNBF support from dish edges.
Instead, plan to fab the support attached only to H-frame, not even touching the dish.
True, the correction of one small "ding" is not worth bothering
 
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