Display Morethe SNR on the wideband DATV beacon here is
~10.5 dB with a 2m dish and not very good LNB.
With a 1.2m dish, with 6 dB less gain, it is ~9 dB.
With a 30m dish with 22dB more gain (yes, 22 dB - think about that) it is ~11.5 dB.
Mike
Then I assume that in the case of DATV, the noise floor of the transponder must not be as easy to see as it is on the NB transponder.
Because if you can clearly see both the level of the beacon AND the level of noise on the screen of your receiver, using a small dish, then using a 30-meter one would have the same effect as running the received signal through a (linear) amplifier. The sihnal/noise ratio would not improve.
This is the very point of this thread. Why should a larger dish improve the signal/noise ratio of a received signal from the Oscar 100 transponder? This signal is broadcasted by the sat with a given s/n ratio, which cannot be improved lest breaching some thermodynamics law.