Date: Wed, 28 Dec 2016 14:54:00 -0500
From: Markus Vester <markusvester@aol.com>
To: rsgb_lf_group@blacksheep.org
Message-Id: <15946ff1a8d-6491-23af8@webprd-a52.mail.aol.com>
In-Reply-To: <Pine.LNX.4.64.1612281416010.20461@plato.ucs.mun.ca>
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Subject: Re: LF: EbNaut beaconing from JN64
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Hi Joe,

sorry to read the mishap regarding the poor RasPi memory card. Don't worry =
too much about hitting the "correct" Pilot frequency - it doesn't matter as=
 long as we know where it is, or the frequency word actually sent to the DD=
S. If you like you might just use  the magic number 59055800 ( =3D 03851eb8=
 hex) to come back to the old 137499.99925 Hz.

Glitches seem to be are rare enough to be a problem - I reviewed your files=
 from the other night (Dec 10/11) and found only a single one shortly after=
 23 UT. Sometimes leaving the PC alone seems to help, avoiding unnecessary =
user interface activity.

Anyway LF conditions seem to be improving, and my favourite northern propag=
ation indicaters (Loran-C Korea and Ussurisk) are picking up a bit of stren=
gth. Thought I might send a bit more EbNaut tonight, using same parameters =
as before:=20
 137490 Hz, 2 sec, 8 char, 8K19A, starting on the hour plus about 0.3 s sou=
ndcard delay. =20
Still need to think up a message ;-).

Best 73,
Markus (DF6NM)

-----Urspr=C3=BCngliche Mitteilung-----=20
Von: jcraig <jcraig@mun.ca>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Mi, 28 Dez 2016 7:01 pm
Betreff: Re: LF: EbNaut beaconing from JN64


Hi Markus,

Thank-you for your efforts. The pilot was generated using a raspi/ad9851
but there have been troubles with instability. Bypassing, shielding, etc
over the past few days yeielded no satisfaction and, sadly, a fried pi/SD
card! The arduino still works but the high precision math has to
be done on another machine as work continues on getting a replacement=20
pilot.

73 Joe VO1NA

PS Stefan's coil is very compact. 0,4 mm wire? Hope it can take the kV!
PPS Paul's article greatly apprectiated. Thanks!=20
PPPS All the best to all in 2017


On Sun, 25 Dec 2016, Markus Vester wrote:

> Hi Joe,
>
>
> today I found the time to look into your files from Dec 19/20 (1220xx08.t=
xt etc.). The pilot level is just right now. Assuming an accurate 10 MHz DD=
S-clock, the theoretical pilot frequency would be 137499.999255 Hz, consist=
ent with the -0.8 mHz offset that I had found last time. This allows us to =
determine the course of your RX center frequency, which apparently drifted =
about 10 mHz upwards during that night (137499.8988 to 137499.9088 Hz).
>
>
> Some of the files (e.g. 0708 and 0608, see png) showed phase jumps, which=
 are presumably due to occasional short audio dropouts in the soundcard pro=
cessing. In principle it should be possible to correct these glitches a-pos=
teriori but I have not attempted to do so. The 0308, 0408 and 0508 files lo=
oked good so I calculated the expected offsets for Ric's transmit frequency=
 and attempted decodes. Unfortunately no useful result appeared yet.
>
>
> LF DX conditions haven't been too good lately. But I'm sure that once the=
y improve, you will be able to pick up more than one European EbNaut statio=
n.
>
>
> Best 73,
> Markus
>
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<div style=3D"font-size:10pt;font-family:arial,helvetica,sans-serif;color:b=
lack;"><div style=3D"color: black; font-family: arial,helvetica,sans-serif;=
 font-size: 10pt;">Hi Joe,<br><br>sorry to read the mishap regarding the po=
or RasPi&nbsp;memory card. Don't worry too much about hitting the "correct"=
 Pilot frequency - it doesn't matter as long as we know where it is, or&nbs=
p;the frequency word actually sent to the DDS. If you like&nbsp;you might j=
ust&nbsp;use &nbsp;the magic number 59055800 ( =3D 03851eb8 hex) to come ba=
ck to the old 137499.99925 Hz.<br><br>Glitches seem to be are rare enough t=
o be a problem - I reviewed&nbsp;your files from the other night (Dec 10/11=
) and found only a single one shortly after 23&nbsp;UT. Sometimes leaving t=
he PC alone seems to help, avoiding unnecessary user interface activity.<br=
><br>Anyway&nbsp;LF conditions seem to be improving, and my favourite north=
ern propagation indicaters (Loran-C Korea and Ussurisk) are picking up a bi=
t of strength. Thought I&nbsp;might&nbsp;send a bit more&nbsp;EbNaut tonigh=
t, using same parameters as before:&nbsp;<br>&nbsp;137490 Hz, 2 sec, 8 char=
, 8K19A,&nbsp;starting&nbsp;on the&nbsp;hour plus about 0.3 s soundcard del=
ay.&nbsp;&nbsp;<br>Still need to think up a message ;-).<br><br>Best 73,<br=
>Markus (DF6NM)<br><br>-----Urspr=C3=BCngliche Mitteilung----- <br>Von: jcr=
aig &lt;jcraig@mun.ca&gt;<br>An: rsgb_lf_group &lt;rsgb_lf_group@blacksheep=
.org&gt;<br>Verschickt: Mi, 28 Dez 2016 7:01 pm<br>Betreff: Re: LF: EbNaut =
beaconing from JN64<br><br></div>Hi Markus,<br><br>Thank-you for your effor=
ts.  The pilot was generated using a raspi/ad9851<br>but there have been tr=
oubles with instability. Bypassing, shielding, etc<br>over the past few day=
s yeielded no satisfaction and, sadly, a fried pi/SD<br>card!  The arduino =
still works but the high precision math has to<br>be done on another machin=
e as work continues on getting a replacement <br>pilot.<br><br>73 Joe VO1NA=
<br><br>PS Stefan's coil is very compact.  0,4 mm wire?  Hope it can take t=
he kV!<br>PPS Paul's article greatly apprectiated.  Thanks! <br>PPPS All th=
e best to all in 2017<br><br><br><br><br>On Sun, 25 Dec 2016, Markus Vester=
 wrote:<br><br>&gt; Hi Joe,<br>&gt;<br>&gt;<br>&gt; today I found the time =
to look into your files from Dec 19/20 (1220xx08.txt etc.). The pilot level=
 is just right now. Assuming an accurate 10 MHz DDS-clock, the theoretical =
pilot frequency would be 137499.999255 Hz, consistent with the -0.8 mHz off=
set that I had found last time. This allows us to determine the course of y=
our RX center frequency, which apparently drifted about 10 mHz upwards duri=
ng that night (137499.8988 to 137499.9088 Hz).<br>&gt;<br>&gt;<br>&gt; Some=
 of the files (e.g. 0708 and 0608, see png) showed phase jumps, which are p=
resumably due to occasional short audio dropouts in the soundcard processin=
g. In principle it should be possible to correct these glitches a-posterior=
i but I have not attempted to do so. The 0308, 0408 and 0508 files looked g=
ood so I calculated the expected offsets for Ric's transmit frequency and a=
ttempted decodes. Unfortunately no useful result appeared yet.<br>&gt;<br>&=
gt;<br>&gt; LF DX conditions haven't been too good lately. But I'm sure tha=
t once they improve, you will be able to pick up more than one European EbN=
aut station.<br>&gt;<br>&gt;<br>&gt; Best 73,<br>&gt; Markus<br>&gt;</div>
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