Message-ID: <580CEA96.2010200@posteo.de>
Date: Sun, 23 Oct 2016 18:51:34 +0200
From: DK7FC <selberdenken@posteo.de>
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To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
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Subject: Re: LF: Idiot's guide to receiving Ebnaut? - Tutorial part2
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Hi all,

I started to write the second part of this tutorial but when finished i 
was not happy with the result.

The first thing one can say is that you will need a very frequency 
stable receiver. There is no chance without an external reference 
signal. For generating wav files using SpecLab you will also have to use 
a ref signal to compensate the drift of your soundcard. Some people have 
already prepared things in the past. You can use a 1 PPS signal for 
soundcard drift compensation or a down divided 10 MHz GPS reference or a 
stereo soundcard receiving VLF MSK signals on the other channel to 
compensate the drift.
Also the SpecLab configuration depends on your receiver type.
Now i could simply make some assumptions what your equipment may be but 
this may be not a good way.
So now i think it's better that we start with one example, one (or more) 
of the stations who are interested in EbNaut decodes on LF should 
describe the available system components. Then we can work it out 
<https://www.youtube.com/watch?v=Qyclqo_AV2M> what must be done.
We will need to have a stable RX frequency and a drift compensated 
soundcard frequency in the end.

So who of those who are interested wants to start?

73, Stefan

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Hi all, <br>
<br>
I started to write the second part of this tutorial but when finished i
was not happy with the result. <br>
<br>
The first thing one can say is that you will need a very frequency
stable receiver. There is no chance without an external reference
signal. For generating wav files using SpecLab you will also have to
use a ref signal to compensate the drift of your soundcard. Some people
have already prepared things in the past. You can use a 1 PPS signal
for soundcard drift compensation or a down divided 10 MHz GPS reference
or a stereo soundcard receiving VLF MSK signals on the other channel to
compensate the drift.<br>
Also the SpecLab configuration depends on your receiver type.<br>
Now i could simply make some assumptions what your equipment may be but
this may be not a good way. <br>
So now i think it's better that we start with one example, one (or
more) of the stations who are interested in EbNaut decodes on LF should
describe the available system components. Then <a
 href="https://www.youtube.com/watch?v=Qyclqo_AV2M">we can work it out</a>
what must be done.<br>
We will need to have a stable RX frequency and a drift compensated
soundcard frequency in the end.<br>
<br>
So who of those who are interested wants to start?<br>
<br>
73, Stefan<br>
</body>
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