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DISH SETUP: Single sat, Multi-Sat & Motorised
AV-Comm Polariser + Zinwell lnbf
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<blockquote data-quote="Trust" data-source="post: 996978" data-attributes="member: 181524"><p>Found some time (and spirit) to do some tests , not particularly about the barrel but about the feedhorn .</p><p>Test done at 5º W with my 63 mm ID barrel at the 1.2 m Echostar offset dish with the Zinwell lnb .</p><p>To find the best signal I attached a special adjustment device for setting the focal lenght .</p><p>With this device I can also adjust the barrel in the conicle feedhorn .</p><p></p><p>[ATTACH=full]101185[/ATTACH] </p><p></p><p>[ATTACH=full]101177[/ATTACH] </p><p></p><p>Getting TP 3646 R with 8.2 dB</p><p>When I took away the conicle feedhorn , signal dropped to 5.2 dB</p><p>By moving the barrel with lnb 16 mm closer to the dish , signal increased to 5.7 dB</p><p></p><p>[ATTACH=full]101178[/ATTACH] </p><p></p><p>To get the best signal (7.5 d<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite6" alt=":cool:" title="Cool :cool:" loading="lazy" data-shortname=":cool:" /> with the conicle scale I had to move the barrel and lnb 33 mm more to the dish .</p><p>Removing the plastic cover did bring the signal to 7.7 dB</p><p></p><p>So the focal lenght difference for max. signal between using feedhorn or scale is 49 mm at my setup .</p><p></p><p>Pulling back the Zinwell just one mm , signal was dropping , what would happen when it could deeper into the barrel ?</p><p>Making the Zinwell shorter would give me the answer but I did'nt do that (yet)</p><p>Later I changed the Zinwell for a Panorama lnb which performed allready a little better (locked on 3 TP's more )</p><p>Shortened that one with 5 mm and signal increased with 0.5 dB .</p><p>Being reckless , cut away another 5 mm but that failed , no progress , less signal .</p><p>Still wondering what would happen by shortening the Zinwell .</p></blockquote><p></p>
[QUOTE="Trust, post: 996978, member: 181524"] Found some time (and spirit) to do some tests , not particularly about the barrel but about the feedhorn . Test done at 5º W with my 63 mm ID barrel at the 1.2 m Echostar offset dish with the Zinwell lnb . To find the best signal I attached a special adjustment device for setting the focal lenght . With this device I can also adjust the barrel in the conicle feedhorn . [ATTACH=full]101185[/ATTACH] [ATTACH=full]101177[/ATTACH] Getting TP 3646 R with 8.2 dB When I took away the conicle feedhorn , signal dropped to 5.2 dB By moving the barrel with lnb 16 mm closer to the dish , signal increased to 5.7 dB [ATTACH=full]101178[/ATTACH] To get the best signal (7.5 dB) with the conicle scale I had to move the barrel and lnb 33 mm more to the dish . Removing the plastic cover did bring the signal to 7.7 dB So the focal lenght difference for max. signal between using feedhorn or scale is 49 mm at my setup . Pulling back the Zinwell just one mm , signal was dropping , what would happen when it could deeper into the barrel ? Making the Zinwell shorter would give me the answer but I did'nt do that (yet) Later I changed the Zinwell for a Panorama lnb which performed allready a little better (locked on 3 TP's more ) Shortened that one with 5 mm and signal increased with 0.5 dB . Being reckless , cut away another 5 mm but that failed , no progress , less signal . Still wondering what would happen by shortening the Zinwell . [/QUOTE]
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DISH SETUP: Single sat, Multi-Sat & Motorised
AV-Comm Polariser + Zinwell lnbf
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