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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
C-Band Reception, UK and Europe
About Channels Master and C band Lnb
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<blockquote data-quote="Vipersan" data-source="post: 801904" data-attributes="member: 325666"><p>Hi Djgeo....</p><p>You are extremely lucky that you have such a big dish to use ..</p><p>You may well get away with a combined C/Ku H/V switched LNB as used in the USA on BUDs ..</p><p>The gain is notoriously lower than a single dedicated lnb on ku reception ...but unless you intend to use the dish for fringe reception in ku ...the combination lnb will most likely be adequate.</p><p>The problem I can forsee with using a combined H/V lnb is that IF you intend to go after Circular polarised signals in C band ..this will require a depolarizing plate to be inserted in the lnb throat ...and consequently this will have dramatic effects on the linear polarised ku signals ..</p><p>Thus it will have to be removed physically when receiving ku.</p><p>Other alternatives would include a Corotor type feed with orthomode outs/feeds for seperate ku / C lnbs ..but these are not H/V switched ..so you would in effect need 2 ku lnbs attached ..and 2 C band LNBs..</p><p>But ..the depolarising plate could be mechanically positioned to have minimal effect when receiving linear.</p><p>The final alternative is to use 3 seperate lnbs at the focus ...1 C band with plate for circular ...1 C band lnb without plate for linear ...and 1 ku lnb for linear ..</p><p>With this arrangement only 1 of the 3 lnbs could exist at the true fucus ..</p><p>The other 2 ..displaced to either side ...and requiring repositioning of the dish to allow them to be used...</p><p>Effectively between 2 and 6 degrees inaccuracy of centre focus.</p><p>I hope this covers all possibilities ...</p><p>But in the end ..its up to you ..and what you intend to receive.</p><p>rgds</p><p>VS</p><p></p><p>_http://www.chaparral.net/store/</p><p></p><p>_http://www.sadoun.com/Sat/Order/LNBFS/C-Band-LNBF.htm</p></blockquote><p></p>
[QUOTE="Vipersan, post: 801904, member: 325666"] Hi Djgeo.... You are extremely lucky that you have such a big dish to use .. You may well get away with a combined C/Ku H/V switched LNB as used in the USA on BUDs .. The gain is notoriously lower than a single dedicated lnb on ku reception ...but unless you intend to use the dish for fringe reception in ku ...the combination lnb will most likely be adequate. The problem I can forsee with using a combined H/V lnb is that IF you intend to go after Circular polarised signals in C band ..this will require a depolarizing plate to be inserted in the lnb throat ...and consequently this will have dramatic effects on the linear polarised ku signals .. Thus it will have to be removed physically when receiving ku. Other alternatives would include a Corotor type feed with orthomode outs/feeds for seperate ku / C lnbs ..but these are not H/V switched ..so you would in effect need 2 ku lnbs attached ..and 2 C band LNBs.. But ..the depolarising plate could be mechanically positioned to have minimal effect when receiving linear. The final alternative is to use 3 seperate lnbs at the focus ...1 C band with plate for circular ...1 C band lnb without plate for linear ...and 1 ku lnb for linear .. With this arrangement only 1 of the 3 lnbs could exist at the true fucus .. The other 2 ..displaced to either side ...and requiring repositioning of the dish to allow them to be used... Effectively between 2 and 6 degrees inaccuracy of centre focus. I hope this covers all possibilities ... But in the end ..its up to you ..and what you intend to receive. rgds VS _http://www.chaparral.net/store/ _http://www.sadoun.com/Sat/Order/LNBFS/C-Band-LNBF.htm [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
C-Band Reception, UK and Europe
About Channels Master and C band Lnb
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