AW: LF: a little EbNaut TX test from JN64bw

["Bernhard Wiesgickl" <bernhard.wiesgickl@asamnet.net>]

Hi Riccardo,

I decoded all your transmissions from 0:00 until 4:30 with success. Still sometimes a glitch in the transmission but not in every.

BER changed between 0 % and a few % from transmission to transmission.

One decode showed – I think a faulty - Es/No of 60 dB

 

 

Von: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] Im Auftrag von Riccardo Zoli
Gesendet: Dienstag, 25. September 2018 19:31
An: LF Group
Betreff: Re: LF: a little EbNaut TX test from JN64bw

 

 

Thanks to Markus, Stefan and Bernd.

Well, Markus: the feedback is connected to the "L" (or "I" signal toward SDR) output channel. After a "perturbation", the system re-locks the phase in a few of seconds, but seems to lose the nominal phase reference.

 

Update 25 Sept. 16:00UTC:

With Domenico (thanks Dom!), we held a quick exchange of views and he told me to check the "GPS phase lock" flag, which was effectively disabled and now enabled.

I'm transmitting for a new test with the same EbNaut parameters every a half of hour (started at 16:30 UTC).

 

 

All the best

 

 

73 de Riccardo IW4DXW

 

Il Mar 25 Set 2018, 11:03 Bernhard Wiesgickl <bernhard.wiesgickl@asamnet.net> ha scritto:

Hi Riccardo,

here a screenshot:

 

Fehler! Es wurde kein Dateiname angegeben.

 

The glitch is nearly in every file at different positions.

If you are interested, I could send you the files.

 

Bernd, DF9RB

Von: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] Im Auftrag von DK7FC
Gesendet: Dienstag, 25. September 2018 09:37
An: rsgb_lf_group@blacksheep.org
Betreff: Re: LF: a little EbNaut TX test from JN64bw

 

Hi Riccardo,

Am 24.09.2018 23:49, schrieb Riccardo Zoli:

Please, Stefan: how many times have you seen that glitches on your decodes?

No so many, maybe once per hour. I don't know the exact number.
On one transmission it looked like you lost the frequency lock, the phase was very unstable. I think it is unlikely that it is propagation. Sorry, i already deleted the txt and wav files after getting the results. Maybe Bernd/DF9RB can show you a screencapture of showrawsyms...

About VLF, in the next days I will schedule some transmissions.

That is very apprechiated.

P.S.: Congrats Stefan (and Edgar) for your great achievements @ 17470.1 Hz!

Thank you. Soon there may be a new success to report. The stack is developing positively.

73, Stefan