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From: Andy Talbot <andy.g4jnt@gmail.com>
Date: Sun, 23 Oct 2016 18:03:40 +0100
Message-ID: <CAA8k23QB1Fd1Ki25vGvjn7kFhgNATQp5nJf17xfSncJ7_n+sRQ@mail.gmail.com>
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: Idiot's guide to receiving Ebnaut? - Tutorial part2
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This may not be the most helpful answer, but here are details of a high
stability locked LF receiver and associated software I made for
compatibility with receiving EBnaut transmisisons last year.   It ignores
the soundcard completely, and instead has an external digitiser on a
receiver, all locked to an external Rb or Cs reference.

http://www.g4jnt.com/Coherent_LF_Receiver.pdf

Andy  G4JNT


On 23 October 2016 at 17:51, DK7FC <selberdenken@posteo.de> wrote:

> 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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<div dir=3D"ltr"><div><br></div>This may not be the most helpful answer, bu=
t here are details of a high stability locked LF receiver and associated so=
ftware I made for compatibility with receiving EBnaut transmisisons last ye=
ar. =C2=A0 It ignores the soundcard completely, and instead has an external=
 digitiser on a receiver, all locked to an external Rb or Cs reference.<div=
><br></div><div><a href=3D"http://www.g4jnt.com/Coherent_LF_Receiver.pdf">h=
ttp://www.g4jnt.com/Coherent_LF_Receiver.pdf</a><br></div><div><br></div><d=
iv>Andy =C2=A0G4JNT</div><div><br></div><div class=3D"gmail_extra"><br><div=
 class=3D"gmail_quote">On 23 October 2016 at 17:51, DK7FC <span dir=3D"ltr"=
>&lt;<a href=3D"mailto:selberdenken@posteo.de" target=3D"_blank">selberdenk=
en@posteo.de</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" sty=
le=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><u></u=
>


 =20

<div bgcolor=3D"#ffffff" text=3D"#000000">
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&#39;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=3D"https://www.youtu=
be.com/watch?v=3DQyclqo_AV2M" target=3D"_blank">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>
</div>

</blockquote></div><br></div></div>

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