Message-ID: <4F97E9C2.9030000@iup.uni-heidelberg.de>
Date: Wed, 25 Apr 2012 14:10:42 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: Generating 8970 Hz carrier with Spectrum Lab ?
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Hi Peter,

Am 25.04.2012 11:12, schrieb PA1SDB, Peter:
> Hello VLF,
> I like to do some local test here with Spectrum lab setings (and who 
> knows, High ERP transmissions later  :-)
> I have here a notebook that generates a signal with the Signal 
> generator in Spectrum Lab at 8970.1 Hz.
> It has a Loop connected at the input and thats how it is locked to a 
> GDO (HWU, FTA, what is available)
> I tried several, and that Lock wondow gets green, but output looks 
> terrible.
> To radiate the signal I use a pice of wire at the notebook LS output.
> Below two grab's over the same periode of time.
> My localy generated signal at 8970.100 Hz and for comparison the 
> signal of DJ8WX at 8970.022 Hertz.
> Both grab's are made with the same Spectrum Lab task.
> Why does my signal look like a widband FM transmission ?

That can happen when multiple phase glitches occur on the PC, sound 
output. Try to use a different sample rate, maybe 44100 instead of 48000.
Try to run SL exclusively, i.e. no other programs and internet usage 
(everthing that may take a high CPU load) and see if it makes a difference.
The signal of DJ8WX is clear. That reduces the possible errors...

73, Stefan/DK7FC

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Hi Peter, <br>
<br>
Am 25.04.2012 11:12, schrieb PA1SDB, Peter:
<blockquote cite="mid:FB72BFCD7B564064B0C93A0FD2DA9448@Extensa"
 type="cite">
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  <div><font face="Georgia">Hello VLF,</font></div>
  <div><font face="Georgia">I like to do some local test here with
Spectrum lab setings (and who knows, High ERP transmissions later&nbsp; :-)</font></div>
  <div><font face="Georgia">I have here a notebook that generates a
signal with the Signal generator in Spectrum Lab at 8970.1 Hz.</font></div>
  <div><font face="Georgia">It has a Loop connected at the input and
thats how it is locked to a GDO (HWU, FTA, what&nbsp;is available)</font></div>
  <div><font face="Georgia">I tried several, and that Lock wondow gets
green, but output looks terrible.</font></div>
  <div><font face="Georgia">To radiate the signal I use a pice of wire
at the notebook LS&nbsp;output.</font></div>
  <div>&nbsp;</div>
  <div><font face="Georgia">Below two grab's over the same periode of
time.</font></div>
  <div><font face="Georgia">My localy generated signal at 8970.100 Hz
and for comparison the signal of DJ8WX at 8970.022 Hertz.</font></div>
  <div>&nbsp;</div>
  <div><font face="Georgia">Both grab's are made with the same Spectrum
Lab task.</font></div>
  <div>&nbsp;</div>
  <div><font face="Georgia">Why does my signal look like a widband FM
transmission ?</font></div>
</blockquote>
<br>
That can happen when multiple phase glitches occur on the PC, sound
output. Try to use a different sample rate, maybe 44100 instead of
48000.<br>
Try to run SL exclusively, i.e. no other programs and internet usage
(everthing that may take a high CPU load) and see if it makes a
difference.<br>
The signal of DJ8WX is clear. That reduces the possible errors...<br>
<br>
73, Stefan/DK7FC<br>
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