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Date: Wed, 28 Sep 2016 19:10:58 +0200
From: Michel Brunel <f5wk@mterrier.net>
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To: Domenico IZ7SLZ <rsgb_lf_group@blacksheep.org>
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Subject: Re: LF: F5WK EbNaut
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Hi,
Big thanks to Domenico, Markus and Stefan for their successful decoding of =
my EbNaut transmissions.
Ebnaut decoding is not an easy task especially with weak signal.
I fear my GPSDO frequency was not as accurate than expected. I had the bad =
idea to use a low cost GPS antenna wich performed
not as good as the professional grade antenna I used for tests at home. Thu=
s some jitter and phase jumps depending on GPS constellation position.
As a "proof of concept" I made Loran-C records during the day using the eb=
naut setup and results are sometime good sometime not so good.
The transmitter overcurrent was randomly triggered by the phase reversal. =
Bpsk modulation is performed synchronously by exclusive OR gates, between t=
he D flip-flop and the MOS drivers. Phase reversal is like changing the fre=
quency for a very short time, which leads to a current pike due to the high=
Q of the LF antenna. Decision was taken to bypass the overcurrent detectio=
n.
The good way to do bpsk modulation is with a suitable DDS such as AD9852.=
=20
I found the antenna performs poorly at LF since the radials are burried in =
a sandy soil, as time goes on. No big deal for ebnaut though.
A lot of things to improve for my next LF campaign,=20
73,
Michel - f5wk/P=20
Le mercredi 28 septembre 2016 =C3=A0 11:08:55, Domenico =C3=A9crivait :
Hello LF,
EbNaut test signals from Michel F5WK/P in Normandy has been received also =
here in JN80NU (QRB =3D 1700 km).
This is the list of my decodes:
DATE TIME UT Time OFFSET [s] EbN0[dB] Carrier E=
bN0[dB] Rk
26-09-2016 21:30 0 0.9 =
1.9 0 =20
message:F5WK JN18HP
---------------------------------------------------------------------------=
---------------------------------------------------
27-09-2016 18:30 1 5.6 =
6.7 0 =20
27-09-2016 19:00 1 7.8 =
9.0 0 =20
27-09-2016 19:30 1 5.1 =
5.8 0 =20
27-09-2016 20:00 1 6.1 =
6.7 0 =20
27-09-2016 20:30 1 6.5 =
6.7 0 =20
27-09-2016 21:00 1 NIL
27-09-2016 21:30 1 3.7 =
4.6 0 =20
27-09-2016 22:00 1 3.0 =
4.4 0 =20
message: F5WK IN99EF
receiver in use: JRC NCR-92M with 10 MHz GPDO with 7m passive whip antenna.
Congratulation Michel for your EbNaut nice going; can you describe your set=
up ?
73, Domenico IZ7SLZ
On 27 September 2016 at 00:22, Markus Vester <markusvester@aol.com> wrote:
Michel F5WK is running EbNaut tonight! He's got a strong and stable Signal,=
and the 21 UT sequence produced a successful decode here.
Thanks to Michel for the test transmissions, and to Domenico IZ7SLZ for kin=
dly passing on the Information.
Best 73,
Markus (DF6NM)
---------- Forwarded message ----------
From: "Michel Brunel" <f5wk@mterrier.net>
Date: 26 Sep 2016 18:41
Subject: Re: Need some help !
To: "Domenico IZ7SLZ" <iz7slz.domenico@gmail.com>
Cc:=20
Hi Domenico,
I'm now ready to transmit an ebnaut test at UTC 18:00:00
- 137489.999179 Hz
- message length 11
- Coding 8K19A
- symbol period 1.0
- duration 13:20:00
Estimated ERP: 100 mW=20
Michel - f5wk/P
--
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Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: quoted-printable
<html><head><title>Re: LF: F5WK EbNaut</title>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3Dutf-8">
</head>
<body>
<span style=3D" font-family:'Calibri'; font-size: 12pt;">Hi,<br>
<br>
Big thanks to Domenico, Markus and Stefan for their successful decoding of =
my EbNaut transmissions.<br>
Ebnaut decoding is not an easy task especially with weak signal.<br>
<br>
I fear my GPSDO frequency was not as accurate than expected. I had the bad =
idea to use a low cost GPS antenna wich performed<br>
not as good as the professional grade antenna I used for tests at home. Thu=
s some jitter and phase jumps depending on GPS constellation position.<br>
As a "proof of concept" I made Loran-C records during the day using t=
he ebnaut setup and results are sometime good sometime not so good.<b=
r>
<br>
The transmitter overcurrent was randomly triggered by the phase rever=
sal. Bpsk modulation is performed synchronously by exclusive OR gates, betw=
een the D flip-flop and the MOS drivers. Phase reversal is like changing th=
e frequency for a very short time, which leads to a current pike due to the=
high Q of the LF antenna. Decision was taken to bypass the overcurrent det=
ection.<br>
The good way to do bpsk modulation is with a suitable DDS such as AD9852.&n=
bsp;<br>
<br>
I found the antenna performs poorly at LF since the radials are burried in =
a sandy soil, as time goes on. No big deal for ebnaut though.<br>
<br>
A lot of things to improve for my next LF campaign, <br>
<br>
73,<br>
Michel - f5wk/P <br>
<br>
<br>
<br>
Le mercredi 28 septembre 2016 =C3=A0 11:08:55, Domenico =C3=A9crivait :<br>
<br>
</span><table>
<tr>
<td width=3D2 bgcolor=3D #0000ff><br>
</td>
<td><span style=3D" font-family:'calibri'; font-size: 12pt;">Hello LF,<br>
<br>
EbNaut test signals from Michel F5WK/P in Normandy has been received =
also here in JN80NU (QRB =3D 1700 km).<br>
This is the list of my decodes:<br>
<br>
<b>DATE TIME UT Time OFFSE=
T [s] EbN0[dB] Carrier EbN=
0[dB] Rk<br>
</b>26-09-2016 21:30  =
; 0 &=
nbsp; 0.9 &n=
bsp; 1.9 &nbs=
p; 0 <br>
message:<b>F5WK JN18HP<br>
</b>-----------------------------------------------------------------------=
-------------------------------------------------------<br>
27-09-2016 18:30 1 =
 =
; 5.6 =
6.7 &=
nbsp; 0 <br>
27-09-2016 19:00 1 =
 =
; 7.8 =
9.0 &=
nbsp; 0 <br>
27-09-2016 19:30 1 =
 =
; 5.1 =
5.8 &=
nbsp; 0 <br>
27-09-2016 20:00 1 =
 =
; 6.1 =
6.7 &=
nbsp; 0 <br>
27-09-2016 20:30 1 =
 =
; 6.5 =
6.7 &=
nbsp; 0 <br>
27-09-2016 21:00 1 =
 =
; NIL<br>
27-09-2016 21:30 1 =
 =
; 3.7 =
4.6 &=
nbsp; 0 <br>
27-09-2016 22:00 1 =
 =
; 3.0 =
4.4 &=
nbsp; 0 <br>
message:<b> F5WK IN99EF<br>
<br>
</b>receiver in use: JRC NCR-92M with 10 MHz GPDO with 7m passive whip ante=
nna<b>.<br>
<br>
</b>Congratulation Michel for your EbNaut nice going; can you describe your=
setup ?<br>
73, Domenico IZ7SLZ<br>
<br>
<br>
<br>
<br>
<br>
On 27 September 2016 at 00:22, Markus Vester <</span><a style=3D" font-f=
amily:'calibri'; font-size: 12pt;" href=3D"mailto:markusvester@aol.com">mar=
kusvester@aol.com</a><span style=3D" font-family:'calibri'; font-size: 12pt=
;">> wrote:<br>
<span style=3D" font-family:'arial'; font-size: 10pt;">Michel F5WK is runni=
ng EbNaut tonight! He's got a strong and stable Signal, and the 21 UT seque=
nce produced a successful decode here.<br>
<br>
Thanks to Michel for the test transmissions, and to Domenico IZ7SLZ for kin=
dly passing on the Information.<br>
<br>
Best 73,<br>
Markus (DF6NM)<br>
<br>
---------- Forwarded message ----------<br>
From: "Michel Brunel" <</span></span><a style=3D" font-family:'arial'; f=
ont-size: 10pt;" href=3D"mailto:f5wk@mterrier.net">f5wk@mterrier.net</a><sp=
an style=3D" font-family:'arial'; font-size: 10pt;">><br>
Date: 26 Sep 2016 18:41<br>
Subject: Re: Need some help !<br>
To: "Domenico IZ7SLZ" <</span><a style=3D" font-family:'arial'; font-siz=
e: 10pt;" href=3D"mailto:iz7slz.domenico@gmail.com">iz7slz.domenico@gmail.c=
om</a><span style=3D" font-family:'arial'; font-size: 10pt;">><br>
Cc: <br>
<br>
<span style=3D" font-size: 12pt;">Hi Domenico,<br>
<br>
I'm now ready to transmit an ebnaut test at UTC 18:00:00<br>
- <b>137489.999179 Hz<br>
- message length 11<br>
- Coding 8K19A<br>
- symbol period 1.0<br>
- duration 13:20:00<br>
<br>
</b>Estimated ERP: 100 mW <br>
<br>
Michel - f5wk/P<br>
</td>
</tr>
</table>
<br><br>
<br>
<br>
<span style=3D" font-family:'arial'; color: #c0c0c0;"><i>-- </body></h=
tml>
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