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Re: LF: High Speed EbNaut on LF

To: [email protected]
Subject: Re: LF: High Speed EbNaut on LF
From: DK7FC <[email protected]>
Date: Mon, 15 Oct 2018 17:45:22 +0200
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Hi Domenico, Riccardo, Markus, LF,

I also copied that message, see attachment :-) Not bad, 60 characters in less than 3 minutes in daylight on LF!
What about a longer message? :-)

73, Stefan

PS: I try to set up that auto-decoder as well. And maybe i'll be back on LF...



Am 14.10.2018 17:46, schrieb Domenico IZ7SLZ:



LF,

yesterday October 13, during daytime,  i had a very nice reception with low QRN/QRM floor. So i have invited Riccardo to send some EbNaut messages with 30 or 60 characters using a very short symbol period from 1 s to  0.05 s.
We had some positive decodes also with 60 characters and 0.05 s/sym:
 
2018-10-13_13:30:00 137490.000Hz N=60 T=0.05s 8K19A CRC=16 list=1000 sym=3152 Duration=157.60s
found rank 0 ber 2.1605e-01 Eb/N0 4.5 M -1.234827161e+00 ph 1 180,180,180,180
[TU DOM AND MARKUS FER HIGH BIT RATE EBN0 RPRT 73 DE IW4DXW K]
QRB between us is about 650 km.

The complete log of the test is listed in the website : https://www.qsl.net/iz7slz/EBNAUT/DECODED.TXT    from 09:30  to 15:00 UT of 2018-10-13.

Some messages have been decoded also by Markus DF6NM with his 'D' auto-decoder: http://df6nm.darc.de/opds/ebnautresults.txt

So,  it is possible to exchange on LF messages of 60 characters with less than 3 minute transmission. I think that 30 Characters at 0.1 s/symbol can be a good settings for a 'fast' QSO with 10 minutes timeslot : TX ends within 3 minutes, so, using an auto-decode program, should be possible to reply at next '10' minute.

73, Domenico IZ7SLZ
 

Attachment: 60charLF.png
Description: PNG image

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