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prodeline dish1.8M

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Ex Member
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Feb 24th, 2007 at 7:22am  
Dear All
i have a dish 1.8 prodeline solid dish (offset)
but the other part was missing, like feed support
can any body help me the lenght of the tree support /left/right/center ?
cause i want to made it my self.
fyi, the purpose of the dish is for RX only.

thanks and regards

Boni
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Ex Member
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Reply #1 - Feb 24th, 2007 at 11:19am  
If it is 1184 antenna, with 22.3 degrees of offset, you should fix the feedhorn from the reflector at the following parameters: (unfortunately I don't have one nearby to give you the dimensions of the feed support tubes, and the manual wouldn't tell either).

Inclination of feedhorn: 41 degrees (upwards)
"A": (from the bottom of feenhorn to the bottom of reflector): 97cm
"B": (from top of the feedhorm to bottom of reflector: 112.1cm
"C": (from bottom of feedhorn to top of reflector): 181.9cm
"D": (from top of feedhorn to top of reflector): 172.1cm


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Reply #2 - Feb 27th, 2007 at 3:48am  
Thanks for your advice,
i'll try,

thanks again,
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Eric Johnston
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Reply #3 - Feb 27th, 2007 at 9:19am  
Here are another set of A B C D measurements for an old Prodelin 1.8m antenna.

A=40.114 inches
B=44.107 inches
C=72.012 inches
D=69.310 inches

These relate to a Ku band transmit/receive feed.
Obviously you get different measurements for a large diameter C band feed or a tiny Ku band feed as used for receive only.

I have found that averaging, like so (A+B)/2 and (C+D)/2, gives two useful distances which define a single point at the centre of the feed window.   I suspect that the actual focal point (phase centre) lies a short distance down inside the horn, but this distance will vary from one feed design to another.  

Best regards, Eric.
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Reply #4 - Feb 27th, 2007 at 6:57pm  
thnks mr.eric
i'm verry greatfull for your advice and knowlage here
thnks again

regards
Bonivasius B Daandel
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