Better quality but lost channels

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bodge

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I'm located in Sweden and have just changed the feedhorn on a prime focus dish and noticed a marked improvement of the quality levels for the horizontal channels on Astra 2D . At the same time the vertical channels which i could get at certain times of the day are now totally gone. How can this be possible ?
 
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Play around with the skew..Skew adjustment is very crucial on 2D;)
 
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Hehe...you still struggling around with your feed? its two years now or close?
 
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Yes it has been a long time but with very little result. But at last I have improved quality by a good 10-15% so I'm encouraged. The feed I am using is the Swedish microwave XM 601 . Is it possible I need to add a polariser to improve the 2D verticals?
 
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bodge said:
The feed I am using is the Swedish microwave XM 601 . Is it possible I need to add a polariser to improve the 2D verticals?
Click to expand...


In your dish is "prime focus" you are using the wrong type of feedhorn..
From what i can see on the net,Swedish microwave XM 601 is for Offset dishes not prime focus.
http://www.smw.se/feedhorn.htm

Unless you are using a single band LNB you do not need a polariser..The modern universal LNB's have this polarity switching function inside...
 
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Actually I need this feedhorn because of the shallowness of the dish. The f/d of the dish is 0.53 whereas most prime focus feedhorns only cover the range 0.33-0.42. Since I added this feed instead of an old prime focus feed I have a significantly better signal/quality reading for the horizontal channels.


iceman said:
In your dish is "prime focus" you are using the wrong type of feedhorn..
From what i can see on the net,Swedish microwave XM 601 is for Offset dishes not prime focus.
http://www.smw.se/feedhorn.htm

Unless you are using a single band LNB you do not need a polariser..The modern universal LNB's have this polarity switching function inside...
Click to expand...
 
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maybe you have to play with the focal length to match that of the prime focus feedhorn,have you got room to slide the feedhorn up and down?
 
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