[time-nuts] WWV/H Doppler Shift

[Scud West]

I think I've seen something similar during and after geomagnetic storms - weaker than usual signals, but very low and steady Doppler shifts.  It will be interesting to see how things change when solar activity increases. 

The QS1R is a great receiver.  Even with the original TCXO I could see WWV on 10 and 15 MHz track within 2e-09 while CHU in eastern Canada would have a shift of nearly 1 Hz. As long as you're not dealing with voice signals a pretty modest antenna will probably do.  I use a bandwidth of 20 Hz for carrier level measurements, but the Fldigi would be fine with a wide bandwidth.

Who knew unmodulated carriers could be fun?

Rob


> On Nov 28, 2018, at 1:15 AM, Bill Dailey <docdailey at gmail.com> wrote:
> 
> I used to measure WWV carrier only (a much more pedestrian approach than yours) with a qs1r locked to a Valon synthesizer driven by a a very nice (for my budget) 1000A oscillator that Corby provided me.
> 
> I often saw (now I could be reading your data wrong) a minimal shift when the signal strength was very low. I researched this phenomenon for quite some time and my hypothesis was that this represents a point where you receive only non-Doppler shifted signal via pure reflection at the ionospher.  From the papers is read this component is always received but it is buried within the usually stronger shifted components.  If I remember right there is a name for that direct (non-shifted) component but it escapes me.
> 
> I then moved, got busy and haven’t gotten an antenna back up.  Your results make me want to get less busy again.
> 
> Thanks,
> 
> Bill Dailey