Re: LF: SL settings for EbNaut FFT recording ?

[DK7FC <selberdenken@posteo.de>]

Hi Luis,

What is the link to the grabber (again) please? Something with ure.es i think...

I would prefer to run the soundcard at 48 kS/s anyway because you will be able to run much more SL instances in parallel then. The number of parallel running instances can increase quickly :-)

8.9 hours for a FFT may be a bit to short though. It is not really a short distance so we may need all the time we can get to pass a first short message through. For a spectrogram it makes sense to try 47 uHz i would say.

Can you generate your own test signal on the MF antenna in 7 km distance? It should be possible to see a few 100V put on the TX antenna, so it is worth to experiment a bit. Maybe a microwave transformer from ebay or so. SpecLab can generate the tone/frequency. Use an available audio PA to drive the transformer, carefully. Could become your first DX on VLF! :-)

73, Stefan


Am 30.04.2017 20:49, schrieb VIGILANT Luis Fernández:

Thank you very much Markus

The .USR file is useful, but your detailed explanations are even better to understand what's going on

Would worth to add it to your EbNaut utilities

So far so good. SL is "armed" and working on the next FFT in a few hours

Yes. Patience is a must when you play with high integration FFTs. This is not a game for nervous players ;-)

I was using 192Khz sample rate but have changed to 48KHz to fit with your decimation and FFT lenght

The 1pps syncronization is working good and the SR is adjusted properly. I get the NMEA via com port

and system is reported by SL to be just few mili seconds from GPS 

All ready here to receive a transmission !

73 de Luis

EA5DOM