Date: Tue, 7 Mar 2017 14:14:03 -0500
From: Markus Vester <markusvester@aol.com>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: VLF: Tonite...
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>> The 5 uHz offset may come from the fixed samplerate in the sr file. The =
real samplerate is drifting of course, so there may be very small offsets t=
o the value in the file.

Maybe not. With samplerate lock activated in SpecLab, a samplerate error sh=
ould not affect the center frequency, and only scale the frequency offset e=
ntered into the EbNaut decoder. In my settings, the FFT is usually centered=
 on 8270.0 Hz, so with 0.5 ppm SR uncertainty Stefan's signal at +0.1 Hz mi=
ght be misplaced by a negligible +-0.05 uHz. However as far as I know, Alex=
 has anyway centered his FFT on 8270.1, so the samplerate deviation has no =
influence on frequency and phase. Thus the observed 5 uHz offset is more li=
kely due to a gradual change of propagation phase.

Best 73,
Markus

-----Urspr=C3=BCngliche Mitteilung-----=20
Von: DK7FC <selberdenken@posteo.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Mo, 6. Mrz 2017 22:01
Betreff: Re: VLF: Tonite...


Hello Alex,=20

 Thanks for the 2 character decode. Unfortunately my 2nd attempt for the 8 =
CH message has started to late. And yesterday, the rain was so strong that =
it triggered the safety function, although the limit was set to -150 mA! I =
need a waterproof housing for the coil, not only a trash bag. And i need to=
 insert the transductor to compensate at least a drift of  20 Hz or so.

 The 5 uHz offset may come from the fixed samplerate in the sr file. The re=
al samplerate is drifting of course, so there may be very small offsets to =
the value in the file.

 When will you be in the garden next time?

 73, Stefan
...
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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;">&gt;&gt; The 5 uHz offset may come from the fixed sample=
rate in the sr file. The real samplerate is drifting of course, so there ma=
y be very small offsets to the value in the file.<br><br>Maybe not. With sa=
mplerate&nbsp;lock activated in SpecLab,&nbsp;a samplerate error should&nbs=
p;not affect the center frequency, and only scale the frequency offset ente=
red into the EbNaut decoder. In my settings,&nbsp;the FFT&nbsp;is usually c=
entered on 8270.0 Hz, so&nbsp;with&nbsp;0.5 ppm&nbsp;SR uncertainty Stefan'=
s&nbsp;signal at +0.1 Hz might be misplaced by&nbsp;a negligible +-0.05 uHz=
. However as far as I know, Alex has anyway centered his FFT on 8270.1,&nbs=
p;so the samplerate&nbsp;deviation has&nbsp;no influence on&nbsp;frequency =
and phase.&nbsp;Thus the observed 5 uHz offset is more likely due to a grad=
ual change of propagation phase.<br><br>Best 73,<br>Markus<br><br>-----Ursp=
r=C3=BCngliche Mitteilung----- <br>Von: DK7FC &lt;selberdenken@posteo.de&gt=
;<br>An: rsgb_lf_group &lt;rsgb_lf_group@blacksheep.org&gt;<br>Verschickt: =
Mo, 6. Mrz 2017 22:01<br>Betreff: Re: VLF: Tonite...<br><br></div>
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Hello Alex, <br>
<br>
Thanks for the 2 character decode. Unfortunately my 2nd attempt for the
8 CH message has started to late. And yesterday, the rain was so strong
that it triggered the safety function, although the limit was set to
-150 mA! I need a waterproof housing for the coil, not only a trash
bag. And i need to insert the transductor to compensate at least a
drift of&nbsp; 20 Hz or so.<br>
<br>
The 5 uHz offset may come from the fixed samplerate in the sr file. The
real samplerate is drifting of course, so there may be very small
offsets to the value in the file.<br>
<br>
When will you be in the garden next time?<br>
<br>
73, Stefan<br>
...


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