From: =?iso-8859-1?Q?VIGILANT_Luis_Fern=E1ndez?= <luis@vigilant.es>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Thread-Topic: LF: K3RWR LF EbNaut in CT
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Date: Sat, 24 Mar 2018 18:38:20 +0000
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Subject: Re: LF: K3RWR LF EbNaut in CT
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Hi EbNaut

Yes, Lynux is surely great but we dummies use Windows. So let's see can we =
do there  ;-)

Paul, my Rx is similar to yours. The SDR must be disciplined, then there is=
 a software to deal with the I/Q and produce
demodulated USB audio at the dial frequency which then is feeded to Spectru=
m Lab via VAC. I see no need to compensate
sample rates in VAC, as sound sender and sound receiver are using the same =
clock (derived from PC clock) because all
is made in software. May be I'm wrong but as soon as there is no hardware s=
ound card involved there is no need to concern
about it in VAC cables

SL is easy to use as you can load configuration files tailored to your need=
s. No need to become a SL expert in one week

And to get a disciplined source for your SDR, one way as commented by Stefa=
n is a Ublox GPS. I can add another, which is QRPLabs VFO
https://www.qrp-labs.com/vfo.html
Basically a U3S with different firmware. But the interface is integrated wi=
th a knob dial and display. Specially interesting
is that you can share your existing GPS for the U3S, so you don't need to b=
uy a new one. Then you can generate the required
frequency for your SDR and modify it easily if needed

I want to make a local test generating EbNaut from a 10Mhz reference source=
, divided to somewhere around 137KHz
and decode it with my SDR setup

Question: To modulate the carrier in EbNaut I will use ebnaut_tx for Window=
s http://abelian.org/ebnaut/software_ms.shtml
Stefan told about using a simple XOR to shift the phase with the DTR/RTS ou=
tput. Does it work for LF or as comments by
Paul Nicholson would be better to use a balanced modulator ?

73 de Luis
EA5DOM

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<html dir=3D"ltr">
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
1">
<style type=3D"text/css">=0A=
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<div style=3D"direction: ltr;font-family: Tahoma;color: #000000;font-size: =
10pt;">Hi EbNaut
<div><br>
</div>
<div>Yes, Lynux is surely great but we dummies use Windows. So let's see ca=
n we do there&nbsp; ;-)<br>
<div><br>
</div>
<div>Paul, my Rx is similar to yours. The SDR must be disciplined, then the=
re is a software to deal with the I/Q and produce</div>
<div>demodulated USB audio at the dial frequency which then is feeded to Sp=
ectrum Lab via VAC. I see no need to compensate</div>
<div>sample rates in VAC, as sound sender and sound receiver are using the =
same clock (derived from PC clock) because all</div>
<div>is made in software. May be I'm wrong but as soon as there is no hardw=
are sound card involved there is no need to concern</div>
<div>about it in VAC cables</div>
<div><br>
</div>
<div>SL is easy to use as you can load configuration files tailored to your=
 needs. No need to become a SL expert in one week</div>
<div><br>
</div>
<div>And to get a disciplined source for your SDR,&nbsp;<span style=3D"font=
-size: 10pt;">one way as commented by Stefan is a Ublox GPS. I can add anot=
her, which is QRPLabs VFO</span></div>
<div><a href=3D"https://www.qrp-labs.com/vfo.html" target=3D"_blank" style=
=3D"font-size: 10pt;">https://www.qrp-labs.com/vfo.html</a></div>
<div>Basically a U3S with different firmware. But the interface is integrat=
ed with a knob dial and display. Specially interesting</div>
<div>is that you can share your existing GPS for the U3S, so you don't need=
 to buy a new one. Then you can generate the required</div>
<div>frequency for your SDR and modify it easily if needed</div>
<div><br>
</div>
<div>I want to make a local test generating EbNaut from a 10Mhz reference s=
ource, divided to somewhere around 137KHz</div>
<div>and decode it with my SDR setup</div>
<div><br>
</div>
<div>Question: To modulate the carrier in EbNaut I will use ebnaut_tx for W=
indows&nbsp;http://abelian.org/ebnaut/software_ms.shtml</div>
<div>Stefan told about using a simple XOR to shift the phase with the DTR/R=
TS output. Does it work for LF or as comments by</div>
<div>Paul Nicholson would be better to use a balanced modulator ?</div>
<div><br>
</div>
<div>73 de Luis</div>
<div>EA5DOM</div>
</div>
</div>
</body>
</html>

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