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<blockquote data-quote="Vipersan" data-source="post: 858458" data-attributes="member: 325666">The next stage is to try and construct a matched KA feed based on the C120 shape and design..for the gibby...in copperOnly cos this I can solderSo I now have my ideal outer feed diameter 289mm and ideally the inner circle diameter would be 11.5 mm (1mm walls would be 13.5mm)BUT ..such copper pipe doesnt exist in a rigid form (needed to support weight of lnb)So I will get as close as possible..and use 15mm cold water pipe (15mm - internal diameter 13mm)Close but not perfect..but hopefully would be an improvement.Using these dimensions I should be able to make a cardboard template which could then be folded into a smooth sided cone ..copied to copper sheet..and soldered to a length of 15mm pipe.Then construct a WR42 flange in copper for the other end...Will it work ? ..who knows ..?First I have to make my cone template ..and try and source some thin copper sheet to make it.Another project for another day..rgdsVSouter92mm diameter289mm circumferanceIdeal inner11.5mm36.1 mmSelected inner15mm47.1mm</blockquote>

[QUOTE="Vipersan, post: 858458, member: 325666"] The next stage is to try and construct a matched KA feed based on the C120 shape and design..for the gibby...in copper Only cos this I can solder So I now have my ideal outer feed diameter 289mm and ideally the inner circle diameter would be 11.5 mm (1mm walls would be 13.5mm) BUT ..such copper pipe doesnt exist in a rigid form (needed to support weight of lnb) So I will get as close as possible..and use 15mm cold water pipe (15mm - internal diameter 13mm) Close but not perfect..but hopefully would be an improvement. Using these dimensions I should be able to make a cardboard template which could then be folded into a smooth sided cone ..copied to copper sheet..and soldered to a length of 15mm pipe. Then construct a WR42 flange in copper for the other end... Will it work ? ..who knows ..? First I have to make my cone template ..and try and source some thin copper sheet to make it. Another project for another day.. rgds VS outer 92mm diameter 289mm circumferance Ideal inner 11.5mm 36.1 mm Selected inner 15mm 47.1mm [/QUOTE]

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