[Elecraft] P3 - WWV spectrum display

[Fred Jensen]

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