John Ackermann N8UR wrote: > Good job on the hfexplorer software, Chuck! Just a couple of > suggestions: (a) trying to tune in broadcast stations on AM resulted in > horrible distortion -- sounds like extreme overload and clipping;
I just tried putting an AM signal into the USRP + BasicRX + hf_explorer_9a and found a problem with the AM demod. Putting in a signal with 30% modulation @ 1kHz at a signal strength of up to about -55dBm (which shows about +15dB on the FFT) sounds just fine, though there's a bit of hiss. But when you increase the signal strength to ~-53dBm (501uV), it's as though an oscillation breaks out -- you hear another somewhat distorted tone along with the received signal, and the level of that tone increases rapidly until at about -48dBm (890uV) it maxes out, with quite a bit of distortion. The increase between those two levels is almost a step function, it's that rapid. John _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
