Using ex-satellite dishes

From BATC Wiki
Jump to navigation Jump to search

Your local household waste disposal area (tip) is a great source of parabolic dishes which are very usable on the microwave amateur bands - and it's environmentally friendly to re-cycle them!

Finding the feed point

The easiest way to find the feed point is just carefully replace the LNB with the feed or replacement LNB in exactly the same position. However this is not always possible - but luckily there are a great number of pages on the web showing how to find the point:

Online calculator to find the feed point of an offset dish: http://www.satsig.net/pointing/finding-dish-offset-angle.htm

http://www.satsig.net/22-deg-offset-dish.htm

http://www.john-legon.co.uk/offsetdish.htm

http://www.ntms.org/files/Nov2015/Fun_with_Off-set_dish.pdf


Feeds for dishes

Excellent design by Brian G4NNS: http://myweb.tiscali.co.uk/g4nns/FeedHorn.html

http://www.w1ghz.org/antbook/conf/dualband_feedhorn.pdf

http://www.w1ghz.org/10g/dualhorn.htm