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I found that drawing through your inserted link of ftapinamar blog [Antenas Offset (8)]. And you wrote there
I made google search for Parabola_6.2 by strannik (search results lead to russian language websites) and offset_v1_0.xls by F6AGR ( first result of search prompt to .xls file download). Seems ftapinamar blog (spanish), strannik's posts (russian) and french .xls file are informative but not much useful for someone like me whose academic language is only English.
I could not find formulae for d1 and d2 in that french article (.xls) ! Found only numerical values of d1 & d2.
My motto would be: don't invest in programs that are not accurate, when there are others that are accurate: Parabola_6.2 by strannik, or offset_v1_0.xls by F6AGR. (And not to forget my own spreadsheet calculator, but that is not published yet.)
I made google search for Parabola_6.2 by strannik (search results lead to russian language websites) and offset_v1_0.xls by F6AGR ( first result of search prompt to .xls file download). Seems ftapinamar blog (spanish), strannik's posts (russian) and french .xls file are informative but not much useful for someone like me whose academic language is only English.
I could not find formulae for d1 and d2 in that french article (.xls) ! Found only numerical values of d1 & d2.