Thanks Jim. This is COOL.
73, Yngvi TF3Y On Tue, Sep 1, 2015 at 3:13 AM, Jim Brown <j...@audiosystemsgroup.com> wrote: > On Mon,8/31/2015 10:04 AM, Yngvi (TF3Y) wrote: > >> Even though I'm personally most interested in CW I wonder if there is any >> recent two tone SSB tests that's been published? >> > > I've published some SSB bandwidth measurements using pink noise as > excitation. Because pink noise contains all frequencies, the spectra > resembles music and speech, and is dynamic, it excites IMD in a manner > comparable to speech. > > http://k9yc.com/P3_Spectrum_Measurements.pdf > > http://k9yc.com/FTDX5000_Report.pdf > > So far, I've measured only a few rigs using pink noise, but of those I've > measured, I've seen very little difference between them. > > On the air is a very different story -- it's VERY common to see distortion > on SSB signals in the form of both upper and lower sidebands on audio > peaks. Because it is present in both sidebands, I strongly suspect it's > caused by power amps that are over-driven, or poorly tuned, or improperly > biased. We hear it as splatter (sometimes as wide as 10-20 kHz), and see it > on the P3 and horizontal lines corresponding to audio peaks. > > > 73, Jim K9YC > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to t...@tf3y.net > -- http://www.tf3y.net ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
