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On Friday 09 December 2016 15:43:40 you wrote:
> After doing a lot of modifications here on the TX side, the effect still
> exists. I can't get rid of the unstable phase shown on the VLF tree grabber.
>
> One thing to mention is that the phase seems to change slowly, no sudden
> phase jumps. Thus the peak is 40 dB S/N in 47 uHz. So obviously there
> were much less uncorrected phase glitches than expected in the first
> moment when i saw the effect.
>
May be a crazy idea... but the atmosphere refractive index (and light speed and wavelength) change a little with pressure, temperature and humidity.
50 uHz at 3 kHz are 1.7e-8 so may be you can detect very little drifts.
http://emtoolbox.nist.gov/Wavelength/Documentation.asp
73 de Claudio, ik2pii
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