Message-ID: <51B9992A.9010407@iup.uni-heidelberg.de>
Date: Thu, 13 Jun 2013 12:04:26 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: Whole house EMC/I filtering
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Hi Laurence,

Good work! Can you tell something about the noise reduction on LF / VLF 
in dB, roughly?

If i would life in a house like you, i would do the same of course. But 
here the density of houses is so high that there would be only a small 
improvement, it any at all.

How does the circuit of that filter look like? Which cores are used for 
the internal inductors? Do they still work well on LF or MF?

73, Stefan/DK7FC


Am 13.06.2013 06:39, schrieb Laurence KL1 X:
> Up here in Alaska I can finally announce Spring is here as the last of 
> the snow melted in the garden today and 812 squadron Mosquito command 
> has air superiority. We are effectively at 24 hours daylight so Dx on 
> MF and LF is sparser than winter...
>
> Ive had a project to clear which has been with me for 4 years and that 
> is to clean up the incoming and outgoing 2 phase AC mains connection 
> to reduce the conducted noise into the house wiring and what ever I do 
> here is fairly 'blocked" to some extent to the outside world - ie the 
> NSA snooping on my AC supply :-)
>
> http://kl7uk.com/Corcom.jpg
>
> Shows the ongoing installation of 2 x (up to) 3 phase 200A Corcom 
> filters - one for my emergency 100A board (with Gen bypass) and the 
> other for non-essentials.  The system is now live and I can tell you 
> my general reception of 'mains" borne conduction QRM is lower, but I 
> have some work to quantify the overall results. Its not perfect as I 
> do have a little 'C and L" as Im using the same input and output Galv 
> pipe for all the conductors but in real terms the insertion losses are 
> going to be respectable.
>
> Just thought Id share
>
> Laurence KL1 X  WE2 XPQ (about to change callsigns again to confuse)

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Hi Laurence, <br>
<br>
Good work! Can you tell something about the noise reduction on LF / VLF
in dB, roughly?<br>
<br>
If i would life in a house like you, i would do the same of course. But
here the density of houses is so high that there would be only a small
improvement, it any at all. <br>
<br>
How does the circuit of that filter look like? Which cores are used for
the internal inductors? Do they still work well on LF or MF?<br>
<br>
73, Stefan/DK7FC<br>
<br>
<br>
Am 13.06.2013 06:39, schrieb Laurence KL1 X:
<blockquote cite="mid:BLU177-W2023C9E616811A99AAEBABCF870@phx.gbl"
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  <div dir="ltr">Up here in Alaska I can finally announce Spring is
here as the last of the snow melted in the garden today and 812
squadron Mosquito command has air superiority. We are effectively at 24
hours daylight so Dx on MF and LF is sparser than winter...<br>
  <br>
Ive had a project to clear which has been with me for 4 years and that
is to clean up the incoming and outgoing 2 phase AC mains connection to
reduce the conducted noise into the house wiring and what ever I do
here is fairly 'blocked" to some extent to the outside world - ie the
NSA snooping on my AC supply :-)<br>
  <br>
  <a moz-do-not-send="true" href="http://kl7uk.com/Corcom.jpg"
 target="_blank">http://kl7uk.com/Corcom.jpg</a><br>
  <br>
Shows the ongoing installation of 2 x (up to) 3 phase 200A Corcom
filters - one for my emergency 100A board (with Gen bypass) and the
other for non-essentials.&nbsp; The system is now live and I can tell you my
general reception of 'mains" borne conduction QRM is lower, but I have
some work to quantify the overall results. Its not perfect as I do have
a little 'C and L" as Im using the same input and output Galv pipe for
all the conductors but in real terms the insertion losses are going to
be respectable.<br>
  <br>
Just thought Id share<br>
  <br>
Laurence KL1 X&nbsp; WE2 XPQ (about to change callsigns again to confuse)<br>
  </div>
</blockquote>
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