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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
C-Band Reception, UK and Europe
@ Nelson ...sos
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<blockquote data-quote="Vipersan" data-source="post: 786229" data-attributes="member: 325666"><p>Now this is interesting ..</p><p>I haven't worked out whats different ..or indeed ...what the problem is but..</p><p>We are all pretty much aware that AFN exhibits unusual properties at 1W ..</p><p>But Flipping the H/V L/R polarity as the setup currently is </p><p>..completely kills the signal from ERTU ...BBC Arabic ...plus the data trasponders etc ..</p><p>Not so AFN ..</p><p>Switching polarity ie V to H or as it actually is L to R does not kill the signal ...it remains constant around 2 db ..</p><p>not enough to lock in either polarity ..but _does_ indicate there is something odd about this signal ..</p><p>Effectively the plate no longer depolarises 4176V/R ...????</p><p>This obviously has something to do with the heightened ..or tweaked positioning of the lnb ...or feed...or plate ..or both ..but only happens on this one transponder.</p><p>I can only conclude what we have long suspected ...the polarisation of AFN is different to the run of the mill signals on all other circular polarised signals.</p><p></p><p>I've no doubt I can get it back ..but would mean destroying the heightened response of the current setup to do it..</p><p>Any thoughts on this anomaly are very welcome ..as I'm confused to say the least ..</p><p>rgds</p><p>VS</p></blockquote><p></p>
[QUOTE="Vipersan, post: 786229, member: 325666"] Now this is interesting .. I haven't worked out whats different ..or indeed ...what the problem is but.. We are all pretty much aware that AFN exhibits unusual properties at 1W .. But Flipping the H/V L/R polarity as the setup currently is ..completely kills the signal from ERTU ...BBC Arabic ...plus the data trasponders etc .. Not so AFN .. Switching polarity ie V to H or as it actually is L to R does not kill the signal ...it remains constant around 2 db .. not enough to lock in either polarity ..but _does_ indicate there is something odd about this signal .. Effectively the plate no longer depolarises 4176V/R ...???? This obviously has something to do with the heightened ..or tweaked positioning of the lnb ...or feed...or plate ..or both ..but only happens on this one transponder. I can only conclude what we have long suspected ...the polarisation of AFN is different to the run of the mill signals on all other circular polarised signals. I've no doubt I can get it back ..but would mean destroying the heightened response of the current setup to do it.. Any thoughts on this anomaly are very welcome ..as I'm confused to say the least .. 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
@ Nelson ...sos
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