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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
C-Band Reception, UK and Europe
Does AFN use RHCP or RHEP ?
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<blockquote data-quote="Vipersan" data-source="post: 889338" data-attributes="member: 325666"><p>A question relating to the hit n miss nature of AFN at 1west which we questioned some while back ..</p><p>That there is something odd about this signal in relation to other Circular broadcast transmissions..</p><p>I have done some reading up on just how the vectors relate to each other during rotating or circular fields..</p><p>We all know that dielectric materials placed at 45 degrees to the H and V probes in a voltage switched LNB depolarise or convert signals to a useable H and V ...and this is achieved by delaying one field ie the H or V component by 1/4 rotation...</p><p>Odd then that a dielectric plate placed first at exactly 45 degrees to a correctly orientated lnb will produce lockable results from both AFN and BBC Africa (Both RHCP) ...and the same plate rotated by only a couple of degrees + or - 45 degrees makes little difference to BBC Africa ...and practically no difference to AFN rotated anticlockwise ...but the same difference clockwise makes the signal unlockable..</p><p>I never questioned this until I read of the possibility of transmissions with one field greater in amplitude during vector rotation ...ie elliptical polarisation RHEP ...or it's counterpart LHEP..</p><p>Apparently postulated for terrestrial communications with mobile phone networks as having a greater V to H component could have better penetrative properties through structures ...</p><p>Maybe I'm posting absolute crap ..</p><p>..and just thinking out loud..</p><p>rgds</p><p>VS</p></blockquote><p></p>
[QUOTE="Vipersan, post: 889338, member: 325666"] A question relating to the hit n miss nature of AFN at 1west which we questioned some while back .. That there is something odd about this signal in relation to other Circular broadcast transmissions.. I have done some reading up on just how the vectors relate to each other during rotating or circular fields.. We all know that dielectric materials placed at 45 degrees to the H and V probes in a voltage switched LNB depolarise or convert signals to a useable H and V ...and this is achieved by delaying one field ie the H or V component by 1/4 rotation... Odd then that a dielectric plate placed first at exactly 45 degrees to a correctly orientated lnb will produce lockable results from both AFN and BBC Africa (Both RHCP) ...and the same plate rotated by only a couple of degrees + or - 45 degrees makes little difference to BBC Africa ...and practically no difference to AFN rotated anticlockwise ...but the same difference clockwise makes the signal unlockable.. I never questioned this until I read of the possibility of transmissions with one field greater in amplitude during vector rotation ...ie elliptical polarisation RHEP ...or it's counterpart LHEP.. Apparently postulated for terrestrial communications with mobile phone networks as having a greater V to H component could have better penetrative properties through structures ... Maybe I'm posting absolute crap .. ..and just thinking out loud.. rgds VS [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
C-Band Reception, UK and Europe
Does AFN use RHCP or RHEP ?
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