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ouistion about prime focus dish serfice and refleting signal

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hello every one

I have notice some thing for many years

that the small circle close to dish center in reflecting the same degree of signal as the bigger circle close to dish edge

but the big circle is olmost three time the area of the small circle

-- I have this low gain - bad local made 160 cm prime focus


-- and a china made lnb with wave guide like the invacom feed

-1- I but three pices of metal close to the center

-2- and the same three cose to...


ouistion about prime focus dish serfice and refleting signal

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