Scott Ellington wrote: > > Page 36 of the K3 owner's manual: > > "AFV shows the true RMS value of receiver AF output (mVp-p), unaffected by > AF GAIN control. " >
While that may be true for sinusoidal signals I doubt it holds for noise measurements. Accurate noise measurements require a "true RMS-responding" meter...not a peak-responding or average-responding meter calibrated to display RMS for sinusoidal waves (only). Many DMMs throw around the term "true RMS" but are actually NOT true RMS-responding (which is required for accurate noise measurement). True RMS meters are much more expensive and will measure both sinusoidal and non-sinusoidal signals including noise. Most analog DMMS use thermocouples to determine the heating value (or energy content) of signals. There is a way to do true RMS with a DSP but would require a much wider bandwidth (i.e. higher sampling rate) than the K3 uses. 73, Bill -- View this message in context: http://elecraft.365791.n2.nabble.com/APF-tp5963894p5967684.html Sent from the [K3] mailing list archive at Nabble.com. ______________________________________________________________ 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
