MIME-Version: 1.0
In-Reply-To: <568D9257.8070306@abelian.org>
References: <CAC+C6w5JHUUFO-1A7g6z+xywhyNysQX6sMNR2m8-k+5zLDrr6w@mail.gmail.com>
	<CAC+C6w7Q0gFFcX=8Rh5b8AL1kr9BCQG3yiohOKEcSGVKUON+HQ@mail.gmail.com>
	<568D9257.8070306@abelian.org>
Date: Wed, 6 Jan 2016 23:34:08 +0000
Message-ID: <CAC+C6w6PSLfQxhSOsGtXTDxiYk21szRQsVAQQjeW64BgcvSidQ@mail.gmail.com>
From: Domenico IZ7SLZ <iz7slz.domenico@gmail.com>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Cc: riccardozoli@libero.it
Subject: Re: LF: MF Ebnaut transmissions from Riccardo IW4DXW
Content-Type: multipart/alternative; boundary=001a11412d2261a79d0528b2ca47
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org
Status: RO

--001a11412d2261a79d0528b2ca47
Content-Type: text/plain; charset=UTF-8

Hi,

Yes, Paul thanks for your comments.

Riccardo IW4DXW made some tests also today.
First of all he solved a small bug in the math of the PIC leading his
frequency out of 0.01 Hz.
Then he made some transmissions on 478460.00 Hz  using down to 0.4 W (abt 1
mW ERP) and i got his messages several times  (QRB = 650 km).

This is the last:

ebnaut-rx V0.3g
input file C:\EbNaut\01062233.wav
sample rate 125.008900 per second
rx frequency 478500
file start time 2016-01-06 22:29:33.770
polynomial 8K19A
number of chars 16
block size 112
symbol period 0.500
number of symbols 1040
list length 20000
start offset 26.230
freq offset -40.000000
cores 1
padded 21.974 seconds at end
initial reference phase -44.0
---------------------------------------------
found IZ7SLZ GN IW4DXW
list rank 0
reference phase  180  180  180  180
carrier RMS 6.491e+005 noise RMS 4.288e+004
carrier S/N 23.60 dB in 1923.1 uHz
carrier Es/N0 -6.57 dB
carrier Eb/N0 4.00 dB
info bit period 5.70 seconds
symbol error rate 296/1040 = 28.462 %
Es/N0 from symbol errors -7.9 dB
Eb/N0 from symbol errors 2.4 dB
Shannon capacity 2068.8 bits/hour
Shannon efficiency 30.5 %
symbols file C:\EbNaut\01062233-symbols.csv
elapsed 10 seconds

EbNaut looks very promising also in MF !

IW4DXW will complete his receiver in few time. Maybe he will be ready for a
QSO in the week-end.Hope that Markus and other operators can join the tests
on MF.

All the best.
Domenico, iz7slz

On 6 January 2016 at 22:16, Paul Nicholson <vlf0403@abelian.org> wrote:

>
> Nice work!  Well done to Riccardo for getting the coherent
> transmission working.
>
> The timing looks good and with the signal available, it'll
> probably do 0.1 second symbols easily.  I don't have
> anything available to receive coherently at MF so cannot
> join in the fun.  Perhaps someone can recommend a suitable
> SDR that I can clock from a 10Mhz GPSDO?
>
> Here I'm still working on CRCs and ploughing through the
> math to calculate code performance.  Even with knowledge of
> the complete weight spectrum of the code, it is proving to
> be immensely difficult but I'm making some progress.
>
> The version of EbNaut now on the website has a selectable
> CRC length and some improvements that I mentioned a week
> ago, but I recommend staying with 16 bit CRC for now.
>
> --
> Paul Nicholson
> --
>
>

--001a11412d2261a79d0528b2ca47
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div><div><div><div>Hi,<br><br></div>Yes, Paul thanks for =
your comments.<br><br>Riccardo IW4DXW made some tests also today.<br></div>=
First of all he solved a small bug in the math of the PIC leading his frequ=
ency out of 0.01 Hz.<br></div>Then he made some transmissions on 478460.00 =
Hz=C2=A0 using down to 0.4 W (abt 1 mW ERP) and i got his messages several =
times=C2=A0 (QRB =3D 650 km).<br><br></div>This is the last:<br><div><br>eb=
naut-rx V0.3g<br>input file C:\EbNaut\01062233.wav<br>sample rate 125.00890=
0 per second<br>rx frequency 478500<br>file start time 2016-01-06 22:29:33.=
770<br>polynomial 8K19A<br>number of chars 16<br>block size 112<br>symbol p=
eriod 0.500<br>number of symbols 1040<br>list length 20000<br>start offset =
26.230<br>freq offset -40.000000<br>cores 1<br>padded 21.974 seconds at end=
<br>initial reference phase -44.0<br>--------------------------------------=
-------<br>found IZ7SLZ GN IW4DXW<br>list rank 0<br>reference phase=C2=A0 1=
80=C2=A0 180=C2=A0 180=C2=A0 180<br>carrier RMS 6.491e+005 noise RMS 4.288e=
+004<br>carrier S/N 23.60 dB in 1923.1 uHz<br>carrier Es/N0 -6.57 dB<br>car=
rier Eb/N0 4.00 dB<br>info bit period 5.70 seconds<br>symbol error rate 296=
/1040 =3D 28.462 %<br>Es/N0 from symbol errors -7.9 dB<br>Eb/N0 from symbol=
 errors 2.4 dB<br>Shannon capacity 2068.8 bits/hour<br>Shannon efficiency 3=
0.5 %<br>symbols file C:\EbNaut\01062233-symbols.csv<br>elapsed 10 seconds<=
br><br><div><div><div>EbNaut looks very promising also in MF !<br><br></div=
><div>IW4DXW will complete his receiver in few time. Maybe he will be ready=
 for a QSO in the week-end.Hope that Markus and other operators can join th=
e tests on MF.<br></div><div><br></div><div>All the best.<br></div><div>Dom=
enico, iz7slz<br></div></div></div></div></div><div class=3D"gmail_extra"><=
br><div class=3D"gmail_quote">On 6 January 2016 at 22:16, Paul Nicholson <s=
pan dir=3D"ltr">&lt;<a href=3D"mailto:vlf0403@abelian.org" target=3D"_blank=
">vlf0403@abelian.org</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_q=
uote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1e=
x"><br>
Nice work!=C2=A0 Well done to Riccardo for getting the coherent<br>
transmission working.<br>
<br>
The timing looks good and with the signal available, it&#39;ll<br>
probably do 0.1 second symbols easily.=C2=A0 I don&#39;t have<br>
anything available to receive coherently at MF so cannot<br>
join in the fun.=C2=A0 Perhaps someone can recommend a suitable<br>
SDR that I can clock from a 10Mhz GPSDO?<br>
<br>
Here I&#39;m still working on CRCs and ploughing through the<br>
math to calculate code performance.=C2=A0 Even with knowledge of<br>
the complete weight spectrum of the code, it is proving to<br>
be immensely difficult but I&#39;m making some progress.<br>
<br>
The version of EbNaut now on the website has a selectable<br>
CRC length and some improvements that I mentioned a week<br>
ago, but I recommend staying with 16 bit CRC for now.<br>
<br>
--<br>
Paul Nicholson<br>
--<br>
<br>
</blockquote></div><br></div>

--001a11412d2261a79d0528b2ca47--