>From G3PLX: > Alan K2WS demonstrated the horrendous broadband noise coming from a very > expensive Audigy 2ZS card by using the spectrum display of his IC-7800 > http://www.n9vv.com/K2WS.html He dumped the Audigy and bought a nice > Delta-66 that has continued to delivery great performance and a clean TX > signal. > de ken n9vv
That's a picture of the broadband noise EMITTED from the audio OUTPUT side of the soundcard in question. My query is about the digital noise registered by the input ADC. The tests I have done so far say that there is 8 bits of background noise (1 bit = 6dB) coming from the 24-bit ADC in the Firebox with the input shorted. That says there's only 16-bits of useful signal in there. Why should I pay for 24 bits when 8 of them are below the noise? I say again: Is there anybody out there writing their own SDR software that has actually masked-off the bottom 8 bits or replaced it with random numbers? Phil: I could measure how many bits of noise there are in 16-bit cards, but that would only tell me something about how good or bad 16-bit cards are. What I am trying to figure out is whether we are all buying 24-bit cards because we really need 24 bits, or are we buying 24-bit cards because the manufacturers want us to spend more money. 73 Peter _______________________________________________ FlexRadio mailing list [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
