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<blockquote data-quote="John" data-source="post: 993255" data-attributes="member: 175005">Ok, interesting ..... a polarising barrel should give possibly up to 2dB performance increase over any inserted slab method.Firstly, could you re-take some more pics at various angles but use the max resolution / file size that the forum will allow (1meg, or just a knat's under) as your first pics are not of any use to see close up detail of the steps or the scalar positioning on the barrel.&nbsp;&nbsp; To me, the steps don't quite look right or it might just be the low res pics to blame.&nbsp; Looking back a few posts to my drawings of my original AV-Comm barrel dimensions, are yours on your home brew the same to 1/2mm or so ? and could you please do us a drawing showing your dimensions.Iv'e just finished a barrel that is for Extended C-band use, it uses a barrel with an internal dia of 60mm and it actually works better than the standard 3.4-4.2 GHz AV-Comm barrel at 62.5mm ID, but drops off performance wise as you tune down towards 4.200 GHz.Wim&nbsp; (Trust) will throw a bit more light on it i think cos he had to do a bit of tweeking on his to get it performing to it's best.It will be nice to get to the root of your problem though matey ;)Edit: what dish type and size ?.</blockquote>

[QUOTE="John, post: 993255, member: 175005"] Ok, interesting ..... a polarising barrel should give possibly up to 2dB performance increase over any inserted slab method. Firstly, could you re-take some more pics at various angles but use the max resolution / file size that the forum will allow (1meg, or just a knat's under) as your first pics are not of any use to see close up detail of the steps or the scalar positioning on the barrel. To me, the steps don't quite look right or it might just be the low res pics to blame. Looking back a few posts to my drawings of my original AV-Comm barrel dimensions, are yours on your home brew the same to 1/2mm or so ? and could you please do us a drawing showing your dimensions. Iv'e just finished a barrel that is for Extended C-band use, it uses a barrel with an internal dia of 60mm and it actually works better than the standard 3.4-4.2 GHz AV-Comm barrel at 62.5mm ID, but drops off performance wise as you tune down towards 4.200 GHz. Wim (Trust) will throw a bit more light on it i think cos he had to do a bit of tweeking on his to get it performing to it's best. It will be nice to get to the root of your problem though matey ;) Edit: what dish type and size ?. [/QUOTE]

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