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R: F/D cal of offset dish



Hi Charles, K3VDB

In order to calculate the F/D to be illuminated by a feed for an offset dish
in addition to your data you want to know the distance of the deepest point
from bottom edge along the large axis.

All data required for calculations are:

Diameter of large axis of dish
Diameter of small axis of dish
Depth of dish at deepest point
Distance of deepest point from bottom edge along large axis

I have sent to you the program HDL_ANT version 3b3 written by W1GHZ
(N1BWT) wich allow you to designe as well a feed horn for the above offset
dish.

73" de

i8CVS Domenico

----- Original Message -----
From: Charles Heisler -K3VDB- <ceheisler@suscom.net>
To: <amsat-bb@amsat.org>
Sent: Sunday, March 20, 2005 8:23 PM
Subject: [amsat-bb] F/D cal of offset dish


> Can anyone tell me how to calculate the F/D Ratio of a offset Dish
> so that I can build a 10G feed for it. The original feed was at a focal
> length of ~44.4cm.
> My dish is 66cm X 60.6cm and is 6.5cm deep. I don't think the cal. for a
> round dish is what I want to use.
>
> TNX for any help
> Charlie..K3VDB
> ----
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----
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