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Satellite PC Card Receivers, Internet by Satellite
Strength/Quality in % - what does it really mean?
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<blockquote data-quote="archive10" data-source="post: 903137"><p>True.</p><p>But let's assume this is for pointing and optimising a dish (what else is there a use for on a consumer device?).</p><p>Absolute field strength is useless unless calibrated.</p><p>Relative field strength would be a good start, at least you can compare different readings (optimise the poiting of the dish). So a consistent dB reading from some reference point would be a really good start.</p><p>Of course, this is made more complex if the field strength is not measured before the auto-gain circuit in front of the A/D converter.</p><p>But S/N, and i suspect also C/N ratio is probably a digital figure, so why not state this in dB?</p><p>And MER and BER are surely digitally derived figures.</p><p></p><p>But in all cases, % is completely meaningless, unless you clearly know what it is a percentage of.</p><p></p><p>However, I suspect that the prevalence of % figures in the softwares are due to the APIs of the chipsets expose the signal strength and quality readings as percentages. Application programmers probably just pass the information on, without making any more specific sense of it...</p></blockquote><p></p>
[QUOTE="archive10, post: 903137"] True. But let's assume this is for pointing and optimising a dish (what else is there a use for on a consumer device?). Absolute field strength is useless unless calibrated. Relative field strength would be a good start, at least you can compare different readings (optimise the poiting of the dish). So a consistent dB reading from some reference point would be a really good start. Of course, this is made more complex if the field strength is not measured before the auto-gain circuit in front of the A/D converter. But S/N, and i suspect also C/N ratio is probably a digital figure, so why not state this in dB? And MER and BER are surely digitally derived figures. But in all cases, % is completely meaningless, unless you clearly know what it is a percentage of. However, I suspect that the prevalence of % figures in the softwares are due to the APIs of the chipsets expose the signal strength and quality readings as percentages. Application programmers probably just pass the information on, without making any more specific sense of it... [/QUOTE]
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Strength/Quality in % - what does it really mean?
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