I am currently using a TV sat 80 cm dish, an unmodified LNB and an RTL SDR.
When monitoring the NB transponder in SSB, SDR Console shows a noise floor at about - 90 dBm and the upper beacon some 30 dB above the noise floor.
Is there any point in using a larger dish?
Signals will certainly be stronger, but so will the noise floor too, with the s/n ratio still at 30 dB..
What do you think?