Re: VLF: Tonite...

[Markus Vester <markusvester@aol.com>]

>> The 5 uHz offset may come from the fixed samplerate in the sr file. The real samplerate is drifting of course, so there may be very small offsets to the value in the file.

Maybe not. With samplerate lock activated in SpecLab, a samplerate error should not affect the center frequency, and only scale the frequency offset entered into the EbNaut decoder. In my settings, the FFT is usually centered on 8270.0 Hz, so with 0.5 ppm SR uncertainty Stefan's signal at +0.1 Hz might be misplaced by a negligible +-0.05 uHz. However as far as I know, Alex has anyway centered his FFT on 8270.1, so the samplerate deviation has no influence on frequency and phase. Thus the observed 5 uHz offset is more likely due to a gradual change of propagation phase.

Best 73,
Markus

-----Ursprüngliche Mitteilung-----
Von: DK7FC <selberdenken@posteo.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Mo, 6. Mrz 2017 22:01
Betreff: Re: VLF: Tonite...

Hello Alex,

Thanks for the 2 character decode. Unfortunately my 2nd attempt for the 8 CH message has started to late. And yesterday, the rain was so strong that it triggered the safety function, although the limit was set to -150 mA! I need a waterproof housing for the coil, not only a trash bag. And i need to insert the transductor to compensate at least a drift of  20 Hz or so.

The 5 uHz offset may come from the fixed samplerate in the sr file. The real samplerate is drifting of course, so there may be very small offsets to the value in the file.

When will you be in the garden next time?

73, Stefan
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