Dear DSP Craftsmen, Like a lot of unfortunate radio folk, I'm plagued with frequent, strong, pulse type noise. I'm pursuing other methods of eliminating it. This question is specifically about noise blanking in Flex/PowerSDR.
Noise Blanking problem: The noise blanker in the sdr1000 and most modern radios works very well when there are no other signals present. But... If there are fairly strong signals anywhere else within 50kc or more, the noise blanking effect varies, or pulses in the case of ssb, with the strength of ANY and ALL stronger signals, even if the signals are far removed from the desired signal. Reducing the DSP NB settings means you end up with a very low level of blanking that will accommodate the "range of signals" it is hearing. This is the case to varying degrees with all receivers with noise blankers that I'm aware of and not just to the SDR. I understand why this happens. Question: My question is that since we have sharp dsp filters now, could noise blanking be applied AFTER the filter? This would be >Optional< and >in addition to< the setup now employed since this might not always be preferred. In the above problem case, the operator could select NB3 (the post filter blanker) and leave NB1 and NB2 off. ...or whatever combination produced the best results for that noise and signal. Thanks for considering, Jeff/KA5MIR _______________________________________________ FlexRadio mailing list [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
