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<blockquote data-quote="Vipersan" data-source="post: 722838" data-attributes="member: 325666">Thanks CH ..A very useful pdf ...Sadly I never was much good at maths ...so a lot of it zips over my head ..It certainly indicates the relative usefulness and criticality of the scalar plate (choke) relative to the lnb feed ...and of course these again are both relative to the whole assemblys position relative to the focal point of the dish..Sadly it still doesn't explain the actual focusing action of the rings and just how this is acheived ...Does it use a back and forth reflecting action to the centre of the dish ....or are standing waves created like a cloud accross the rings 'surface' ...The math is interesting but I'd love to see an atual diagram of the relective physics ...Just so I can get a mental picture of whats actuallay going on ..On final thing ..Is it correct to assume the lnb should be nounted first without the choke ..Its mouth postioned at the focal point ..Then the choke added and moved back and forth along the waveguide to optimise signal to noise ...ie signal quality ..Or should the choke be nounted a fixed distange from the waveguide mouth ..then the whole assembly moved back and forth to acheive best results..In my case ..I have no references ..I'm using an lnb that was never deigned for my dish specifically ..On a homebrew mount ..as the dish never had a cband mount ...And using a multi ring choke canabalised from a corotor...So its all a bit hit'n'miss ...but I'm desperate to get maximum gain and signal quality accross the band ...as I lurrv the dx-ing for cband fringe stuff..rgdsVS</blockquote>

[QUOTE="Vipersan, post: 722838, member: 325666"] Thanks CH .. A very useful pdf ... Sadly I never was much good at maths ...so a lot of it zips over my head .. It certainly indicates the relative usefulness and criticality of the scalar plate (choke) relative to the lnb feed ...and of course these again are both relative to the whole assemblys position relative to the focal point of the dish.. Sadly it still doesn't explain the actual focusing action of the rings and just how this is acheived ... Does it use a back and forth reflecting action to the centre of the dish ....or are standing waves created like a cloud accross the rings 'surface' ... The math is interesting but I'd love to see an atual diagram of the relective physics ... Just so I can get a mental picture of whats actuallay going on .. On final thing .. Is it correct to assume the lnb should be nounted first without the choke .. Its mouth postioned at the focal point .. Then the choke added and moved back and forth along the waveguide to optimise signal to noise ...ie signal quality .. Or should the choke be nounted a fixed distange from the waveguide mouth ..then the whole assembly moved back and forth to acheive best results.. In my case ..I have no references .. I'm using an lnb that was never deigned for my dish specifically .. On a homebrew mount ..as the dish never had a cband mount ... And using a multi ring choke canabalised from a corotor... So its all a bit hit'n'miss ...but I'm desperate to get maximum gain and signal quality accross the band ...as I lurrv the dx-ing for cband fringe stuff.. rgds VS [/QUOTE]

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