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Subject Topic: big sat dish, easier to allign?????
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Personbrianconwy
19/10/2013 at 10:05pm
 Location: north wales
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I really meant very high snr.


Persondavid8858
20/10/2013 at 12:56pm
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SNR (signal to noise ratio) is a much better indication that Gain ie +32dB because you don't know and they seldom quote what the +32dB is with respect to.

If its comparing performance to a dipole ( a practical device with unity gain ) then its meaningful figure - if they are quoting it dBi as in against an isotropic then this a theoretical device and meaningless because a quarter wave radiating element in free space without feeder is not a practical proposition.

It should of course read dBd if wrt dipole and dBi if wrt isotropic. Most manufacturers of anything tend to quote the most apparently complimentary figures for whatever they are selling.


The SINAD figure would be even better because it takes account of noise and distortion.

David



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