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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
C-Band Reception, UK and Europe
C-Band in the uk any one useing it
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<blockquote data-quote="Vipersan" data-source="post: 744853" data-attributes="member: 325666"><p>Hi Paul..</p><p>You are at the decision point I assume every C band enthusiast reaches I suspect ..</p><p>Wether to go for an H/V L/R voltage switched lnbf ....or to stick with that wonderful invention ..the corotor and use a single polarity lnb ..adjusting for H/V L/R by shifting a probe ..</p><p>Its a personal choice ..</p><p>What I can say is this .</p><p>FRom my limited exposure so far to Cband a switched H/V lnbf doesn't miss much ...and skew is relatively unimportant to L/R.</p><p>The big disadvantage is of course ..that you have to manually insert the depolarizing plate when switching from linear to circular ..whereas you can still get some sort of signal by tweaking a corotor on linear ..even when the plate is in the way..</p><p>My personal favourite switched LNBF so far is the BSC421 ...again imported as no one sold them in the UK.</p><p>I have tried a handful of others but this one is stable ..reliable..and high gain..</p><p>It claims to be 13K ..and I believe it ..</p><p>There is nothing lower out there that 13K as far as switched LNBFS are concerned ..though I believe you can get to 10K if you buy a single polarity lnb for use with a corotor.</p><p>As far as skew is concerned using a switched lnbf makes little difference when its rotated in circular mode...and once set up correctly for H/V ..the dish movement compensates automatically for the skew ..and small rotations to correct skew ..although having some minimal effect on the signal ....position is fairly optimal accross the band.</p><p>So I conclude ..its a personal preference..</p><p>You can tweak that last fraction of signal from your setup with a corotor...but I do wonder if the loss in gain by not having perfect skew ..isn't compensated for my _not_ having to negotiate a rotating probe and omt angles in a corotor..ie an open throat approach.</p><p>as to the K factor ..anything less than 15 is good ...</p><p>13 is excellect ..</p><p>10 is probably the max but not available in switched lnbfs ...and I can't vouch for these claims.</p><p></p><p>..the lnb(f) s vary considerably in gain and performance ...but anything around 65/70db is good.</p><p></p><p>I'm happy with my BSC421 ..so much so I recommended it to Nelson ...who bought one ..and was also impressed with the performance improvement.</p><p>rgds</p><p>VS</p><p>;)</p></blockquote><p></p>
[QUOTE="Vipersan, post: 744853, member: 325666"] Hi Paul.. You are at the decision point I assume every C band enthusiast reaches I suspect .. Wether to go for an H/V L/R voltage switched lnbf ....or to stick with that wonderful invention ..the corotor and use a single polarity lnb ..adjusting for H/V L/R by shifting a probe .. Its a personal choice .. What I can say is this . FRom my limited exposure so far to Cband a switched H/V lnbf doesn't miss much ...and skew is relatively unimportant to L/R. The big disadvantage is of course ..that you have to manually insert the depolarizing plate when switching from linear to circular ..whereas you can still get some sort of signal by tweaking a corotor on linear ..even when the plate is in the way.. My personal favourite switched LNBF so far is the BSC421 ...again imported as no one sold them in the UK. I have tried a handful of others but this one is stable ..reliable..and high gain.. It claims to be 13K ..and I believe it .. There is nothing lower out there that 13K as far as switched LNBFS are concerned ..though I believe you can get to 10K if you buy a single polarity lnb for use with a corotor. As far as skew is concerned using a switched lnbf makes little difference when its rotated in circular mode...and once set up correctly for H/V ..the dish movement compensates automatically for the skew ..and small rotations to correct skew ..although having some minimal effect on the signal ....position is fairly optimal accross the band. So I conclude ..its a personal preference.. You can tweak that last fraction of signal from your setup with a corotor...but I do wonder if the loss in gain by not having perfect skew ..isn't compensated for my _not_ having to negotiate a rotating probe and omt angles in a corotor..ie an open throat approach. as to the K factor ..anything less than 15 is good ... 13 is excellect .. 10 is probably the max but not available in switched lnbfs ...and I can't vouch for these claims. ..the lnb(f) s vary considerably in gain and performance ...but anything around 65/70db is good. I'm happy with my BSC421 ..so much so I recommended it to Nelson ...who bought one ..and was also impressed with the performance improvement. 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
C-Band in the uk any one useing it
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