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Home made diseqc positioner
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<blockquote data-quote="Channel Hopper" data-source="post: 1087242" data-attributes="member: 175144"><p>Yes, current required changes with frequency, many receivers had only two ferrite settings for each satellite.</p><p></p><p>The formula for the change is not just impacted by frequency though, but type of dielectric inside the polariser, the internal diameter, the ferrit core diameter and the length of the polariser itself.</p><p>The main issue was a continuous voltage provided to an external device, via a bespoke cable run, where the impedance of the wire would change with seasonal and daily temperature fluctuation, plus the atmospheric humidity around the connectors and feedhorn.</p><p></p><p>I think there were also satellite slots with both linear and circular transmissions, requiring further adjustments of the overall bore settings when a dielectric plate was in the feed throat.</p><p></p><p>Their demise could not have come too soon.</p></blockquote><p></p>
[QUOTE="Channel Hopper, post: 1087242, member: 175144"] Yes, current required changes with frequency, many receivers had only two ferrite settings for each satellite. The formula for the change is not just impacted by frequency though, but type of dielectric inside the polariser, the internal diameter, the ferrit core diameter and the length of the polariser itself. The main issue was a continuous voltage provided to an external device, via a bespoke cable run, where the impedance of the wire would change with seasonal and daily temperature fluctuation, plus the atmospheric humidity around the connectors and feedhorn. I think there were also satellite slots with both linear and circular transmissions, requiring further adjustments of the overall bore settings when a dielectric plate was in the feed throat. Their demise could not have come too soon. [/QUOTE]
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Home made diseqc positioner
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