Re: LF: EbNaut test

[Markus Vester <markusvester@aol.com>]

Measurements in Nuernberg are confirming Ric's observations. Frequency and phase were right during the last transmission Jun 20. Only the first few symbols were incorrect, presumably because the software PLL takes a few seconds to aquire first lock towards a "green trace". This could be circumvented by starting the carrier shortly before the beginning of the sequence.

Best 73,
Markus (DF6NM)

-----Ursprüngliche Mitteilung-----
Von: Riccardo Zoli <riccardozoli80@gmail.com>
An: LF Group <rsgb_lf_group@blacksheep.org>
Verschickt: Di, 20. Jun 2017 19:24
Betreff: Re: LF: EbNaut test

Hi Stefan, Domenico, LF

Now it's perfect. Nominal QRG, no phase rotation ;-)

All the best


73 de Riccardo IW4DXW



2017-06-20 15:37 GMT+02:00 DK7FC <selberdenken@posteo.de>:
> Many thanks Domenico.
>
> I think that i found the bug in my configuration now!
> Let me try another attempt and let's see the offset:
>
> f = 137.53 kHz
> Start time: 20.Jun.2017 14:00:00.3 UTC
> Symbol period: 1 s
> Characters: 15
> CRC bits: 16
> Coding 8K19A
> Duration: 16m, 32s
>
>
> 73, Stefan
>
>
>
> Am 20.06.2017 11:14, schrieb Domenico IZ7SLZ:
>
> Hello Stefan,
>
> Here's my decode also.
>
> Found best results at same freq. offset of Riccardo.
>
> The small phase change is due to propagation.
>
> Thanks for the signal and thanks for your calculation of my 'silence' period
> after op32 transmission, that gives me possibility to receive you.
>
> 73, Domenico IZ7SLZ
>
>
> On 20 Jun 2017 10:53, "DK7FC" <selberdenken@posteo.de> wrote:
>>
>> Hello Riccardo,
>>
>> Many thanks for the decode! I would assume that the phase rotation is due
>> to propagation. There is also QSB on LF, although not as strong as on MF.
>> The Alps may add a bit more.
>>
>> 73, Stefan
>>
>>
>> Am 20.06.2017 00:30, schrieb Riccardo Zoli:
>>>
>>> Hi Stefan, Markus, Domenico, LF
>>>
>>> Vy strong here (as usual) in JN64bw, dr Stefan.
>>> Good decode: there is only a little phase rotation and I see you about
>>> 6.3mHz lower than your nominal QRG.
>>>
>>> All the best
>>>
>>> 73 de IW4DXW Riccardo
>>>
>>>
>>>
>>> p.s.: congrats for your efforts and fantastic results in VLF activity.
>>> Keep up the good work!
>>>
>>>
>>>
>>> 2017-06-19 22:42 GMT+02:00 DK7FC<selberdenken@posteo.de>:
>>>
>>>>
>>>> Hello Markus, Domenico,
>>>>
>>>> Ket's just play arround a bit more instead :-) It was such a nice day
>>>> here,
>>>> time for another message :-)
>>>>
>>>> f = 137.53 kHz
>>>> Start time: 19.Jun.2017 20:40:00.3 UTC
>>>> Symbol period: 1 s
>>>> Characters: 40
>>>> CRC bits: 16
>>>> Coding 4K19A
>>>> Duration: 18m, 16s
>>>>
>>>> 73, Stefan
>>>>
>>
>

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