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
<[email protected]>
An: LF Group
<[email protected]>
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 <
[email protected]>:
> 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" <
[email protected]>
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<
[email protected]>:
>>>
>>>>
>>>> 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
>>>>
>>
>
