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DISH SETUP: Single sat, Multi-Sat & Motorised
C-Band Reception, UK and Europe
T Plate vindicated ..well sort of ...
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<blockquote data-quote="Vipersan" data-source="post: 752185" data-attributes="member: 325666"><p>Hi friends ..</p><p>As some of you may be aware ..I have been singing the praises of my polyethylene T plate recently ..</p><p>Llew ..even made one up ..but saw no appreciable difference between its performance and the standard green/brown supplied dielectric plate ..</p><p>So ..I had to prove again to myself it realy does what it says on the tin ..</p><p></p><p>These are the 4 plates I used ..to test</p><p></p><p>A = Standard supplied plate (comes with the lnbf)</p><p></p><p>B = Heavy solid white Teflon ptfe T plate </p><p></p><p>C = polyethylene plate - same material as my T plate ..but without the T crossbar</p><p></p><p>D = My Polyethylene T plate ..</p><p></p><p></p><p>These where tried in turn first with SSTV @20 East</p><p></p><p>Then again on Pentagon Channel 1West</p><p></p><p>Here are the somewhat perplexing results...</p><p></p><p></p><p>A = Standard plate - SSTV 4.7DB (Picture) - Pentagon 2.4 DB (no picture)</p><p></p><p>B = PTFE plate - SSTV 2.0 DB (no picture) - Pentagon 1.9DB (No Picture)</p><p></p><p>C = Short Polyethylense plate - SSTV 2.7 DB (No Picture) - Pentagon 3.0DB (No picture)</p><p></p><p>D = Poyethylene T plate - SSTV 5.5DB (Picture) - Pentagon 6.8DB - (Solid locked Picture)</p><p></p><p>Ok these tests where done on the Alco PF dish ...but even surprised me ..</p><p>Yes the T plate outperforms generally ...but look at the Pentagon result ...its bizzare at best ..</p><p>Almost as though its 'Tuned' to a specific range or range of frequencies ..</p><p>We all know that The AFN C band transmissions @1W are a law unto themselves anyway ...but without the T plate ..I simply couldn't view them ..</p><p></p><p>Can anyone explain whats going on here ..??</p><p>I suspect its a combination of superior dielectric material ..and the crossbars extension above the feed/focus ...and generally this improves signal capture ..but in some cases ....literally doubles and triples the signal arriving at the receivers front end ..</p><p></p><p>Thoughts opinions ..ideas ...in fact any theories are welcome ..</p><p></p><p>I dont believe its the dish thats incorrectly setup ...</p><p>Firstly the sstv results confirm almost identical results T ..and standard plates...</p><p>Also ..I've tried a simillar experiment on an 80cm ..offset dish ..and this too benefitted from the T plate ..</p><p></p><p>rgds</p><p>VS</p><p></p><p>appologies for any typos ..</p><p>My hands dont work too well today ..</p><p>;)</p></blockquote><p></p>
[QUOTE="Vipersan, post: 752185, member: 325666"] Hi friends .. As some of you may be aware ..I have been singing the praises of my polyethylene T plate recently .. Llew ..even made one up ..but saw no appreciable difference between its performance and the standard green/brown supplied dielectric plate .. So ..I had to prove again to myself it realy does what it says on the tin .. These are the 4 plates I used ..to test A = Standard supplied plate (comes with the lnbf) B = Heavy solid white Teflon ptfe T plate C = polyethylene plate - same material as my T plate ..but without the T crossbar D = My Polyethylene T plate .. These where tried in turn first with SSTV @20 East Then again on Pentagon Channel 1West Here are the somewhat perplexing results... A = Standard plate - SSTV 4.7DB (Picture) - Pentagon 2.4 DB (no picture) B = PTFE plate - SSTV 2.0 DB (no picture) - Pentagon 1.9DB (No Picture) C = Short Polyethylense plate - SSTV 2.7 DB (No Picture) - Pentagon 3.0DB (No picture) D = Poyethylene T plate - SSTV 5.5DB (Picture) - Pentagon 6.8DB - (Solid locked Picture) Ok these tests where done on the Alco PF dish ...but even surprised me .. Yes the T plate outperforms generally ...but look at the Pentagon result ...its bizzare at best .. Almost as though its 'Tuned' to a specific range or range of frequencies .. We all know that The AFN C band transmissions @1W are a law unto themselves anyway ...but without the T plate ..I simply couldn't view them .. Can anyone explain whats going on here ..?? I suspect its a combination of superior dielectric material ..and the crossbars extension above the feed/focus ...and generally this improves signal capture ..but in some cases ....literally doubles and triples the signal arriving at the receivers front end .. Thoughts opinions ..ideas ...in fact any theories are welcome .. I dont believe its the dish thats incorrectly setup ... Firstly the sstv results confirm almost identical results T ..and standard plates... Also ..I've tried a simillar experiment on an 80cm ..offset dish ..and this too benefitted from the T plate .. rgds VS appologies for any typos .. My hands dont work too well today .. ;) [/QUOTE]
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DISH SETUP: Single sat, Multi-Sat & Motorised
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T Plate vindicated ..well sort of ...
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