|Subject:||Re: ULF: 17 km experiment on the 101 km band - 3/3|
|From:||Markus Vester <[email protected]>|
|Date:||Thu, 4 Aug 2016 05:52:35 -0400|
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the spectrograms from your far-field recording are now showing a very clear trace on 2970.0025 Hz. Congratulations!
I wonder why the postprocessing analysis takes so long. Apparently SpecLab needs to replay the recordings at the original speed to be able to use DSP features like 1pps lock and noise blanking?
All the best,
Von: DK7FC <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Mi, 3 Aug 2016 3:14 pm
Betreff: Re: ULF: 17 km experiment on the 101 km band 2/3
It took some time to prepare the post-processing of the data. I'm now playing the wav files in windows media player (!! :-) ) and feed the output to VAC3 which is then read by 3 SpecLab instances. The incoming spectrograms are shown on the bottom of this page: http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html The spectrograms become updated each 10 minutes (100 minutes for the 47 uHz instance).
The end is to be expected in 2 days.
I already saw the trace in 212 uHz, as well as the frequency shift (had to restart the analysis for various reasons). But i didn't see the end of the recording yet. In the end of the files, which represent the data of monday morning, the traces should have their best SNR. Also the frequency shift down from 2970.0025 Hz to 2970.0000 Hz should become well visible.
But so far i can say that the SNR is less than expected. This is most likely due to the high QRN and secondly due to the non ideal matching of the antenna resonance (to sharp and not centered on 2970).
Am 01.08.2016 19:38, schrieb DK7FC:
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