Have a look here: http://en.m.wikipedia.org/wiki/Stochastic_resonance
P-T LA7NO On 10 September 2014 01:24, Chuck Smallhouse <[email protected]> wrote: > Dave, N7AIG, > > Please define "stochastic resonance", a new term for me, which may > apparently aid in weak signal detection. > > When I was very active on 2M CW EME, in order to better detect very weak > signals below the noise, I played all kinds of adjustment games with the CW > BW, tone and IF shaping of my TS-930S. For my needs (type of noise) it had > by far the best NB that I've ever used. In addition, I also used an Autek > QF-1 external audio filtering system, centered at about 400 Hz and an > estimated 25 Hz audio BW. It did not ring when adjusted properly. By dumb > luck and extensive experimenting, I discovered that the least expensive > (cheapest) headphones that Radio Shack sold, had a strong mechanical > (audio peak ?) resonance, also at 400 Hz. > > My hearing (unadmitted at the time) had also like Fred's, had been exposed > to many, many very, very loud noises, during one of my careers, and > suffered greatly from Tinitus and overall hearing impairment. It happened > that my preferred or best CW weak signal copying frequency, was 400 Hz. > > Anyway when the searched for very weak signal ( sometimes > -10 dB below > the noise) lined up with all the adjusted BWs, it just seemed to "pop" out > of noise and become detectable. > > So Dave, is this at all related to, or similar to " stochastic > resonance" ? > > Chuck, W7CS > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
