Offset satellite dish geometry

[Paul Hearn]

Confession, I'm not a Radio Amateur but a Radio Astronomer.  I have just started a project to use a motorised TV satellite dish for Galactic Hydrogen line reception at 1420.4 MHz.  I will replace the LNB for a Feed Horn/SAWbird III H-Line LNA designed for 1420.4 MHz.

My question is how do I determine the geometry of the offset dish.  How do I calculate the angle of the incoming radio signal.  

The aim of the project is to map the spiral arms of the Milky Way using drift scan and automated elevation, I will fit a accelerometer to the dish to determine the angle.

(Some of you may remember me as the guy doing VLF reception for solar activity and muon flux measurement, I gave a talk at your club a few years back I felt very welcome). 

Thanks for sharing your expertise - appreciated. 

Paul Hearn RG6 1BU (I don't have a call sign).

[Steve Thompson]

You need to know the offset angle. It might be marked or given in any literature for the dish.
Failing that, this article might help
https://www.satsig.net/pointing/finding-dish-offset-angle.htm

Steve G8GSQ

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[pa...@hearn.org.uk]

Thanks Steve, good information.  I can now calculate the offset angle, this is not given in any of the manufacturers data.

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