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Farm Machinery
Precision Farming & GPS
Fendt variguide
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<blockquote data-quote="Docwalters" data-source="post: 762596" data-attributes="member: 4551"><p>Sorry but you are incorrect.</p><p></p><p>Firstly who puts an antenna IN the cab. It's meant to be located as high as possible on the OUTSIDE of the cab. It is, after all, reaching for a sky-borne signal so it makes sense to get as high as possible to receive that signal away from lumps of metal etc.</p><p></p><p>Secondly, we use a patch antenna which gives us excellent results being a powered antenna. Not all patch antennae are powered. Not all patch antennae are the same.</p><p></p><p>Thirdly, drift does not occur on every pass. If it was that inaccurate no one would use it. </p><p>Satellite drift occurs significantly about every 20 -30 minutes, that is it can take about 20-30 minutes for the Egnos signal to go a little wobbly and drift by about 20cms.</p><p>But not all products are the same since different software interprets the signal in different ways.Some will latch and hold. Others will buffer the result to allow for a more soft-edged change in signal.</p><p>We all know satellite drift occurs;it's the nature of the beast but it is not that fast and some equipment, like ours and others, can be recalibrated for satellite drift on the fly.</p><p></p><p>Fourthly, if you are using a one metre overlap for your fert spreading then you defeat the whole point of using GPS in the first place. If you spread to 20 cm accuracy then your overlap should be, at most, 20cms. In practice, with a good signal and good differential, accuracy can be seen as less than 20 cms and with auto steering significantly less since the autosteer operates far more quickly than the human brain for eye-hand communication.</p><p></p><p>Does that all make sense?</p></blockquote><p></p>
[QUOTE="Docwalters, post: 762596, member: 4551"] Sorry but you are incorrect. Firstly who puts an antenna IN the cab. It's meant to be located as high as possible on the OUTSIDE of the cab. It is, after all, reaching for a sky-borne signal so it makes sense to get as high as possible to receive that signal away from lumps of metal etc. Secondly, we use a patch antenna which gives us excellent results being a powered antenna. Not all patch antennae are powered. Not all patch antennae are the same. Thirdly, drift does not occur on every pass. If it was that inaccurate no one would use it. Satellite drift occurs significantly about every 20 -30 minutes, that is it can take about 20-30 minutes for the Egnos signal to go a little wobbly and drift by about 20cms. But not all products are the same since different software interprets the signal in different ways.Some will latch and hold. Others will buffer the result to allow for a more soft-edged change in signal. We all know satellite drift occurs;it's the nature of the beast but it is not that fast and some equipment, like ours and others, can be recalibrated for satellite drift on the fly. Fourthly, if you are using a one metre overlap for your fert spreading then you defeat the whole point of using GPS in the first place. If you spread to 20 cm accuracy then your overlap should be, at most, 20cms. In practice, with a good signal and good differential, accuracy can be seen as less than 20 cms and with auto steering significantly less since the autosteer operates far more quickly than the human brain for eye-hand communication. Does that all make sense? [/QUOTE]
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Fendt variguide
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