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Re: [english 100%] Re: LF: 2200m Trans-Atlantic QSO dream...

from [DK7FC] [Permanent Link][Original]
To: [email protected]
Subject: Re: [english 100%] Re: LF: 2200m Trans-Atlantic QSO dream...
From: DK7FC <[email protected]>
Date: Tue, 20 Mar 2018 14:20:58 +0100
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Hi Rob,

Am 20.03.2018 12:17, schrieb Rob Renoud:
I do agree that EbNaut is most excellent for experimentation and possibly QSOs on LF.  I believe the LF community should formulate an initial signal configuration for development and testing and one that will possibly support minimum QSO requirements as well.  I am not smart enough about EbNaut at this point to offer any suggestions or make any recommendations about signal configurations.

I am also available to put a EbNaut signal at 1W EIRP on LF from my QTH at FM18qi while I continue implementing full EbNaut RX and decode capability.

All ideas, suggestions and recommendations welcome!

Meanwhile Jay/W1VD should be well equipped and routined for EbNaut reception. His LF RX has always been one of the best in the US. Before attempting QSOs i would suggest to run simple beacons, with a short message like 'K3RWR' :-)

Always use this page to determine the symbol length and CRC to get a specific transmission duration: http://abelian.org/ebnaut/calc.php?sndb=3&snbws=0.022&snmps=&code=8K19&sp=3&crc=24&nc=5&submit=Calculate

The settings are just an example. Assume your beacon repeats each 30 minutes and sends your callsign, then these settings may be a good choice to start.

Once someone has a decode of your transmission, he can report 'you are 3 dB in 22 mHz' (a typical BW for a QRSS-60 spectrogram) and then you can type these values in the tp fields of that page and calculate how many characters could be possible at that SNR in that bandwidth.
And for a RX station it is some advice which optimum list length is recommended.

It would be interesting to see some progress in the use of EbNaut on LF. Then, the step to VLF is an order of magnitude smaller :-)

73, Stefan
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