Those tones are not sine waves. They have distinct harmonic content that makes them a little "sharp" sounding, rather than the soft sound of a pure sine wave. What you're looking at is the components that make it sound that way.
73, Guy. On Mon, Nov 7, 2011 at 7:23 PM, Fred Jensen <k6...@foothill.net> wrote: > While using WWV to "fall back," I reduced the span while watching WWV > such that the VFO A marker was about half the width of the screen, and > there appeared WWV's transmitted spectrum [Never did this before ... > cool!]. 10 MHz WWV is about 25 over S9, I'm on AM with 3.0 KHz DSP BW. > I have the stock roofing filter [2.7 KHz?] > > During silent periods, the carrier is there and I can see the 1 second > ticks. I'm surprised when the tone is on however. Instead of a carrier > and one sideband on either side, I have two sidebands on either side, > equally spaced out from the carrier, like the outer ones are harmonics > of the fundamental audio frequency. The inner ones are about 10 dB > below the peak of the carrier, and the outer ones are about 15-20 dB > below the inner ones. On QSB peaks, a 3rd set appears close to the > baseline. The sidebands fade independently by perhaps 5-8 dB. > > The higher frequency "beep" on each minute produces a very distinct set > of 5 sidebands on each side. I think I can see the BCD code modulation > close in on the carrier and down near the baseline ... or maybe it's > just noise and they don't do BCD code anymore. > > This is so pronounced that there has to be an explanation based on > physics rather than something wrong with my K3/P3, but I'm wondering. > WWV sounds just like the WWV I've come to know and love. > > 73, > > Fred K6DGW > - Northern California Contest Club > - CU in the 2012 Cal QSO Party 6-7 Oct 2012 > - www.cqp.org > ______________________________________________________________ > 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 > ______________________________________________________________ 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
