[opendtv] Noise Figure

Those gremlins are hard at work.

In short, the NF is defined as SNRin - SNRout. And the SNR is assumed at
some temperature, typically 290 or 300 Kelvin.

If one specifies SNRin and SNRout, i.e. all the elements thereof, then
one doesn't need to also specify the NF. Matter of fact, if one does not
specify the temperature, then in principle the NF can be allowed to
vary, with no ill effect to the consumer. That's what I meant about
liquid nitrogen cooling of the receiver.

http://en.wikipedia.org/wiki/Noise_figure

That said, obviously 15.5 dB of C/N and -83 dBm of sensitivity required
from A/74 can be improved upon, as Samsung convincingly showed in the
Gemini receiver it shipped to the CRC for testing.

Bert
 
 
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