To evaluate speech use a pink noise source. That is the standard source signal for acoustic measurements.
Bob, K4TAX Sent from my iPhone > On Jun 20, 2019, at 10:34 AM, John Oppenheimer <j...@kn5l.net> wrote: > > Hi Don, > >> On 6/20/19 9:21 AM, Don Wilhelm wrote: >> John, >> >> That connection is OK if you realize that your scope is reading the DC >> voltage developed by rectifying the RF from 1/2 of the load. You still >> have to use the power formula that is in the DL1 manual. > > Well yes, power references are DCV^2 / 25 > > DdB ratios computed using voltage ratios in the form of > 20 * Log(v1/v2). For example, 0 compression Pep/Pav dB = > 20 * log(15.3/5.24) = 9.3. I do need to flip the table title to Pav/Pep > for proper negative dB values, Done. > >> I prefer to allow the 'scope to read the full peak RF voltage. Connect >> the 'scope probe to the side of one resistor which is connected to the >> BNC jack (one of the leads closest to the BNC), and the 'scope ground >> probe to one or the resistor leads furthermost away from from the BNC jack. > > Using detected RF envelope for oscilloscope average RF measurement at > each digitized point during long, six second, trace. This will result > with increased accuracy when measuring modulated speech. > > John KN5L > >>> On 6/20/2019 9:38 AM, John Oppenheimer wrote: >>> Using DL1 with Oscilloscope to measure KX3 SSB RMS power: >>> >>> https://www.kn5l.net/ssbpower/ >>> >>> Question, is this technique correct? >>> >> > ______________________________________________________________ > 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 rmcg...@blomand.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
