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Satellite TV receivers & systems support forums
Fringe Reception General
0.01dB lnb?
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<blockquote data-quote="ouagadougou" data-source="post: 190265" data-attributes="member: 187470"><p>A Noise Figure of 0.8dB is still a realistic minimum at ku frequencies. The gain of successive transistor devices has improved over the years so that when you cascade them in an LNB they give a better overall noise performance and gain than the older lower gain devices. </p><p></p><p>Low noise temperature gets to a point where you can begin to see temperature variations as you move your dish. This background noise temp amongst other things sets the real background noise level of your system or System Noise Temperature. </p><p></p><p>If you have the equipment you can quite easily measure the noise output increase of your LNBF when you put your hand over the feedhorn becuase the LNBF noise temperature is lower than the physical temp of your hand.</p></blockquote><p></p>
[QUOTE="ouagadougou, post: 190265, member: 187470"] A Noise Figure of 0.8dB is still a realistic minimum at ku frequencies. The gain of successive transistor devices has improved over the years so that when you cascade them in an LNB they give a better overall noise performance and gain than the older lower gain devices. Low noise temperature gets to a point where you can begin to see temperature variations as you move your dish. This background noise temp amongst other things sets the real background noise level of your system or System Noise Temperature. If you have the equipment you can quite easily measure the noise output increase of your LNBF when you put your hand over the feedhorn becuase the LNBF noise temperature is lower than the physical temp of your hand. [/QUOTE]
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Satellite TV receivers & systems support forums
Fringe Reception General
0.01dB lnb?
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