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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Another motorised ka band polarity project.
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<blockquote data-quote="John" data-source="post: 1070997" data-attributes="member: 175005"><p>... More or less finished playing with this little 18GHz - H/V/L/R pol project apart from taking off the temp feed covering due to having a lazer pointer tucked down the feed waveguide whilst aligning the feed up for illumination. It's working surprisingly well to say it's cobbled up from various bits, a home-brew rotory joint, miss-matches on coax adapters etc. I spent a fair while tweeking for best performance and don't think i can improve on it. Did a comparison to see how affective the multi-pol unit was by comparing performance between the two units, a well tweeked Norsat pll lnb fixed in the Vertical pol position looking at the stable 19.2°East Ka Newsnet Comms freq 18561 GHz V and the Multi pol unit, which both are now on the lnb changer on the 1.2 Gibby. The fixed pol has a far simpler signal path with less components in the chain compared to the multi pol unit - see drawing.</p><p>.........................................................................................................................................................................................................................................................................................................</p><p></p><p>[ATTACH=full]124200[/ATTACH][ATTACH=full]124201[/ATTACH]</p></blockquote><p></p>
[QUOTE="John, post: 1070997, member: 175005"] ... More or less finished playing with this little 18GHz - H/V/L/R pol project apart from taking off the temp feed covering due to having a lazer pointer tucked down the feed waveguide whilst aligning the feed up for illumination. It's working surprisingly well to say it's cobbled up from various bits, a home-brew rotory joint, miss-matches on coax adapters etc. I spent a fair while tweeking for best performance and don't think i can improve on it. Did a comparison to see how affective the multi-pol unit was by comparing performance between the two units, a well tweeked Norsat pll lnb fixed in the Vertical pol position looking at the stable 19.2°East Ka Newsnet Comms freq 18561 GHz V and the Multi pol unit, which both are now on the lnb changer on the 1.2 Gibby. The fixed pol has a far simpler signal path with less components in the chain compared to the multi pol unit - see drawing. ......................................................................................................................................................................................................................................................................................................... [ATTACH type="full"]124200[/ATTACH][ATTACH type="full"]124201[/ATTACH] [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Another motorised ka band polarity project.
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