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Date: Thu, 7 Apr 2011 19:17:28 +0100
Message-ID: <BANLkTim_PEmKjb8GSf3f1C0F+4QEgTZ2zQ@mail.gmail.com>
From: Roger Lapthorn <rogerlapthorn@gmail.com>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: VLF QRM puzzle - why not the same in a split screen on SL?
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Thanks to everyone (Wolf, Eddie, Marcus etc) for replying to my question.

Eddie, yes I have seen the trace and how quickly going HF a few Hz the
interfering signals disappear. I was just a bit afraid that for some reason
the top window was less sensitive, but this seems unlikely to be the case.

73s
Roger G3XBM

On 7 April 2011 18:33, wolf_dl4yhf <dl4yhf@freenet.de> wrote:

> Hi Roger,
>
> Guess the burst originates from a periodic signal (maybe something rich in
> harmonics), and one of the harmonics is closer to one of the frequency
> ranges than the other. Or.. the two bands are fed from two different sources
> - one before, and the other after the noise blanker, or clipper ? You can
> quickly check that in the 'circuit' window. But if you say it's just the
> split screen mode, then the two frequency ranges are indeed fed from the
> same FFT.
>
> All the best,
>  Wolf .
>
>
> Am 07.04.2011 18:09, schrieb Roger Lapthorn:
>
>  Help...
>>
>> After lunch today my wife turned on the washing machine and the tumble
>> drier and for two periods there was a burst of interference visible on the
>> lower split screen as vertical noise stripes. What I don't understand is why
>> I don't see these also on the upper trace around 8.976kHz too when the
>> settings are the same.  I have a SL filter selected but it is centred around
>> 8.970kHz with 400Hz width and slopes so this cannot explain this. Surely the
>> noise bursts should appear in both parts of the screen?
>>
>> Can someone who understands Spectrum Lab explain this please?
>>
>> 73s
>> Roger G3XBM
>>
>
>
>


-- 
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
http://www.youtube.com/user/g3xbm
https://sites.google.com/site/sub9khz/

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Thanks to everyone (Wolf, Eddie, Marcus etc) for replying to my question.=
 <br><br>Eddie, yes I have seen the trace and how quickly going HF a few=
 Hz the interfering signals disappear. I was just a bit afraid that for so=
me reason the top window was less sensitive, but this seems unlikely to be=
 the case. <br>
<br>73s<br>Roger G3XBM<br><br><div class=3D"gmail_quote">On 7 April 2011=
 18:33, wolf_dl4yhf <span dir=3D"ltr">&lt;<a href=3D"mailto:dl4yhf@freenet=
.de">dl4yhf@freenet.de</a>&gt;</span> wrote:<br><blockquote class=3D"gmail=
_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left=
:1ex;">
Hi Roger,<br>
<br>
Guess the burst originates from a periodic signal (maybe something rich in=
 harmonics), and one of the harmonics is closer to one of the frequency ra=
nges than the other. Or.. the two bands are fed from two different sources=
 - one before, and the other after the noise blanker, or clipper ? You can=
 quickly check that in the &#39;circuit&#39; window. But if you say it&#39=
;s just the split screen mode, then the two frequency ranges are indeed fe=
d from the same FFT.<br>

<br>
All the best,<br>
 =A0Wolf .<br>
<br>
<br>
Am 07.04.2011 18:09, schrieb Roger Lapthorn:<div><div></div><div class=3D"=
h5"><br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1=
px #ccc solid;padding-left:1ex">
Help...<br>
<br>
After lunch today my wife turned on the washing machine and the tumble dri=
er and for two periods there was a burst of interference visible on the lo=
wer split screen as vertical noise stripes. What I don&#39;t understand is=
 why I don&#39;t see these also on the upper trace around 8.976kHz too whe=
n the settings are the same. =A0I have a SL filter selected but it is cent=
red around 8.970kHz with 400Hz width and slopes so this cannot explain thi=
s. Surely the noise bursts should appear in both parts of the screen?<br>

<br>
Can someone who understands Spectrum Lab explain this please?<br>
<br>
73s<br>
Roger G3XBM<br>
</blockquote>
<br>
<br>
</div></div></blockquote></div><br><br clear=3D"all"><br>-- <br><a href=3D=
"http://g3xbm-qrp.blogspot.com/" target=3D"_blank">http://g3xbm-qrp.blogsp=
ot.com/</a><br><a href=3D"http://www.g3xbm.co.uk" target=3D"_blank">http:/=
/www.g3xbm.co.uk</a><br>
<a href=3D"http://www.youtube.com/user/g3xbm" target=3D"_blank">http://www=
.youtube.com/user/g3xbm</a><br><a href=3D"https://sites.google.com/site/su=
b9khz/" target=3D"_blank">https://sites.google.com/site/sub9khz/</a><br><b=
r>

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