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f/d ratio on dish



Can someone give me  a quick lesson? The answer is probably right in front
of me, I just can't find it.
What is the f/d ratio & how is it correctly determined?  I have a 30 year
old 2.5 meter dish that I wish to place a Patch feed on, however the dish
must be in the window 0.3 - 0.5 f/d.
Thanks in advance.
Gunther Meisse
W8GSM

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