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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
mechanical polarotor
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<blockquote data-quote="s-band" data-source="post: 1164623" data-attributes="member: 407744"><p>Very nice [USER=314801]@dreambox1959[/USER] This has been my approach with the Prodelin offset dish. The examples here are a Gilat Ka band D and an SMW Ku. I've used the same technique for many others. I use a Pololu interface for control. The slots in the mounts allow the focus to be set.</p><p></p><p>[ATTACH]157338[/ATTACH] [ATTACH]157337[/ATTACH]</p><p></p><p>Hmm. I'm not so sure. Maybe if you're only using it for one provider like Sky. I've been used to having skew control on the Prodelin az-el. Now that's down for maintenance, I find it a real PITA having to get onto the roof to adjust the skew on a polar mounted 1.8. The 3.535 degree offset on some Eutelsat craft makes the difference between lock and no lock especially on feeds etc. Try getting BBC Persia (7E 10720H, Europe B beam) without nulling the BBC radio feed TP which is vertical pol on the Europe A beam. There's next to no room for error.</p><p></p><p>Regarding magnetic polarisers, apart from being lossy, they need per frequency skew since their skew varies with frequency.</p></blockquote><p></p>
[QUOTE="s-band, post: 1164623, member: 407744"] Very nice [USER=314801]@dreambox1959[/USER] This has been my approach with the Prodelin offset dish. The examples here are a Gilat Ka band D and an SMW Ku. I've used the same technique for many others. I use a Pololu interface for control. The slots in the mounts allow the focus to be set. [ATTACH alt="11.3GHz_SMW_Prod_DSC2620s1.jpg"]157338[/ATTACH] [ATTACH alt="Type_R+Ka_D_Rotating_DSC3223.JPG"]157337[/ATTACH] Hmm. I'm not so sure. Maybe if you're only using it for one provider like Sky. I've been used to having skew control on the Prodelin az-el. Now that's down for maintenance, I find it a real PITA having to get onto the roof to adjust the skew on a polar mounted 1.8. The 3.535 degree offset on some Eutelsat craft makes the difference between lock and no lock especially on feeds etc. Try getting BBC Persia (7E 10720H, Europe B beam) without nulling the BBC radio feed TP which is vertical pol on the Europe A beam. There's next to no room for error. Regarding magnetic polarisers, apart from being lossy, they need per frequency skew since their skew varies with frequency. [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
mechanical polarotor
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