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Satellite Systems - What to Buy - What to install
Something to make dish skew possible on zone 2 dishes
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<blockquote data-quote="moonbase" data-source="post: 1076211" data-attributes="member: 178786"><p>Absolutely correct, and to be expected.</p><p></p><p></p><p>With a motorised dish it may be down to the resolution of the motor moving the dish across an arc and the accuracy of the polarity skew and declination.</p><p></p><p>For example, a v-box powering a Jaeger 1224 H-H motor generally gives just under 12 pulse counts per degree with a resolution of 1/12th of a degree per click. If a fixed dish has some type of threaded rod for adjustment of azimuth it is easily possible to get a more accurate resolution down to 1/20th of a degree depending of the TPI of the threaded rod and its securing points on a mount.</p><p></p><p>The same logic applies to azimuth and polarity skew. A fine manual adjustment mechanism should generally provide more accuracy than that automatically allocated by a dish traversing an arc powered by a motor.</p><p></p><p>I am not familiar with the resolution available using DiSEqC motors so cannot comment on their accuracy.</p><p></p><p>Does such accurate dish pointing matter, possibly not? It might only come into play when signals being received are extreme fringe and the extra accuracy might get an increase of a few tenths of a dB and achieve a lock.</p><p></p><p>Where the motorised dish comes into it's own after initial setup is the convenience, all done with a remote control or the press of a button on a receiver/controller. No messing about in the dark and rain with a spanner and a meter.</p></blockquote><p></p>
[QUOTE="moonbase, post: 1076211, member: 178786"] Absolutely correct, and to be expected. With a motorised dish it may be down to the resolution of the motor moving the dish across an arc and the accuracy of the polarity skew and declination. For example, a v-box powering a Jaeger 1224 H-H motor generally gives just under 12 pulse counts per degree with a resolution of 1/12th of a degree per click. If a fixed dish has some type of threaded rod for adjustment of azimuth it is easily possible to get a more accurate resolution down to 1/20th of a degree depending of the TPI of the threaded rod and its securing points on a mount. The same logic applies to azimuth and polarity skew. A fine manual adjustment mechanism should generally provide more accuracy than that automatically allocated by a dish traversing an arc powered by a motor. I am not familiar with the resolution available using DiSEqC motors so cannot comment on their accuracy. Does such accurate dish pointing matter, possibly not? It might only come into play when signals being received are extreme fringe and the extra accuracy might get an increase of a few tenths of a dB and achieve a lock. Where the motorised dish comes into it's own after initial setup is the convenience, all done with a remote control or the press of a button on a receiver/controller. No messing about in the dark and rain with a spanner and a meter. [/QUOTE]
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Satellite Systems - What to Buy - What to install
Something to make dish skew possible on zone 2 dishes
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