George, W5YR wrote: >Ian, not to sound too far out in left field, but this does not require >a lot of high-powered math. It is simple transform calculus Ahem.... :-) -- 73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB) Editor, 'The VHF/UHF DX Book' http://www.ifwtech.co.uk/g3sek