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<blockquote data-quote="Vipersan" data-source="post: 967425" data-attributes="member: 325666">Finally got hold of accurate dimensions for a large-ish homebrew patch antenna for 1.5 ghz ..and ordered a nice sheet of 24swg brass to cut it from..looks to be a straightforward build ..and although 0.2 inch balsa was used for the patch/reflector spacing in the original design ...this I will replace with something more weather friendly.Guess what is just the right thickness ..?Those c band dielectric plates that come with every c band lnb ..It will require an lna at the head end ..which will require power which is something of a pita ...on account Bias Tees are so fffing expensive for power-insertion-into-coax.The build will use sma connections as far as the lna ..but standard 50 ohm coax back to the SDR .Just as an aside ..I have invested in a long leverage metal plate hand guillotine ...Got one of fleabay for about £35 delivered ...250 mm blade.Time I had one of these ..on account I find it difficult these days cutting sheet metal ...and hand sheers always make it curl anyhoo ..;)Not sure how well it will perform when used to receive inmarsat ..but what is important imo ...is that unlike a satellite dish which is highly direcional ...the patch _should_ accomodate an inclined bird better..Yes it is still somewhat directional ..but not _as_ critical as a dish....behaving more like a GPS antenna/receiver.</blockquote>

[QUOTE="Vipersan, post: 967425, member: 325666"] Finally got hold of accurate dimensions for a large-ish homebrew patch antenna for 1.5 ghz .. and ordered a nice sheet of 24swg brass to cut it from.. looks to be a straightforward build ..and although 0.2 inch balsa was used for the patch/reflector spacing in the original design ...this I will replace with something more weather friendly. Guess what is just the right thickness ..? Those c band dielectric plates that come with every c band lnb .. It will require an lna at the head end ..which will require power which is something of a pita ...on account Bias Tees are so fffing expensive for power-insertion-into-coax. The build will use sma connections as far as the lna ..but standard 50 ohm coax back to the SDR . Just as an aside ..I have invested in a long leverage metal plate hand guillotine ... Got one of fleabay for about £35 delivered ...250 mm blade. Time I had one of these ..on account I find it difficult these days cutting sheet metal ...and hand sheers always make it curl anyhoo .. ;) Not sure how well it will perform when used to receive inmarsat ..but what is important imo ...is that unlike a satellite dish which is highly direcional ...the patch _should_ accomodate an inclined bird better.. Yes it is still somewhat directional ..but not _as_ critical as a dish....behaving more like a GPS antenna/receiver. [/QUOTE]

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