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DISH SETUP: Single sat, Multi-Sat & Motorised
Triax TDS80 focal point/arm length
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<blockquote data-quote="cj955" data-source="post: 1150412" data-attributes="member: 418694"><p>Hi,</p><p></p><p>Thanks both for the replies.</p><p></p><p>I was hoping initially there'd be a "yes, I've seen this with a few of these" but maybe not! I'm not sure I have the kit to measure the dish with enough accuracy for the calculations.</p><p></p><p>I've spent some time outside today with it and a couple of LNBFs to play around; from what I can test empirically it seems to vary by transponder frequency.</p><p></p><p>The dish was initially in use for EUMETCast before I replaced it; this sits on 11263 H and V on Eutelsat 10B (as of Monday...). To hand I had a cheap SLx grey single and a current version Inverto BU PLL single. With this on either pol the SLx is far too short & the Inverto works best pressed as far in as it'll go (shame it's a lot shorter than the DRO version). When I tried this some time ago a Labgear quad (the £15 PLL one in Screwfix currently) actually had some travel left on the neck when it peaked with a higher C/N.</p><p></p><p>Tried the same with a couple transponders on Hotbird 13... namely 10727 H and 11373 H. On the former, there was a *lot* less difference in the focus distance and almost seemed to peak not quite pressed all the way in on the Inverto, with the SLx being a little behind still but by less. On the latter, very similar to how it behaves on E10B's 11263.</p><p></p><p>Is 500-600 MHz enough to change the phase centre of the feed that considerably?! I wouldn't have expected so. Maybe I should have tried a couple others - but that was enough fiddling as it was!</p><p></p><p>Also tried cable tie-ing the holder atop the arm and adjusting but this peaked at about exactly the same or slightly lower even after some repeated adjustment.</p><p></p><p>cj955</p></blockquote><p></p>
[QUOTE="cj955, post: 1150412, member: 418694"] Hi, Thanks both for the replies. I was hoping initially there'd be a "yes, I've seen this with a few of these" but maybe not! I'm not sure I have the kit to measure the dish with enough accuracy for the calculations. I've spent some time outside today with it and a couple of LNBFs to play around; from what I can test empirically it seems to vary by transponder frequency. The dish was initially in use for EUMETCast before I replaced it; this sits on 11263 H and V on Eutelsat 10B (as of Monday...). To hand I had a cheap SLx grey single and a current version Inverto BU PLL single. With this on either pol the SLx is far too short & the Inverto works best pressed as far in as it'll go (shame it's a lot shorter than the DRO version). When I tried this some time ago a Labgear quad (the £15 PLL one in Screwfix currently) actually had some travel left on the neck when it peaked with a higher C/N. Tried the same with a couple transponders on Hotbird 13... namely 10727 H and 11373 H. On the former, there was a *lot* less difference in the focus distance and almost seemed to peak not quite pressed all the way in on the Inverto, with the SLx being a little behind still but by less. On the latter, very similar to how it behaves on E10B's 11263. Is 500-600 MHz enough to change the phase centre of the feed that considerably?! I wouldn't have expected so. Maybe I should have tried a couple others - but that was enough fiddling as it was! Also tried cable tie-ing the holder atop the arm and adjusting but this peaked at about exactly the same or slightly lower even after some repeated adjustment. cj955 [/QUOTE]
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DISH SETUP: Single sat, Multi-Sat & Motorised
Triax TDS80 focal point/arm length
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