On 23/01/2016 23:35, Michael Black wrote: > What should be the desired range of the received signal? If we're > allowing for 60dB that's a factor of 106, right? And, of course you > don't want to clip the thing so allowing -30000 to 30000 or maybe > -20000 to 20000 would be good? That would put the 0dB value at 283 or > 188 with 9 or 8 bits of resolution at that point respectively. The WSJT-X thermometer meter is calculated from the RMS value of a short period of samples. If 0dB(full scale) is our reference then an RMS of samples values of 1 is roughly -90dB. That level is our meter 0dB reference. So a 30dB noise base is around the 32 RMS sample value. That leaves the other 60dB as headroom so wanted signals should range from +/- 32 up to somewhere short of +/- 32767 which is a usable resolution of 11 bits.
73 Bill G4WJS. ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 _______________________________________________ wsjt-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/wsjt-devel
