Message-ID: <5047D30A.8080404@iup.uni-heidelberg.de>
Date: Thu, 06 Sep 2012 00:32:42 +0200
From: =?windows-1252?Q?Stefan_Sch=E4fer?=
 <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: MF acty
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Hello Lee,

Thank you for giving an imagination how it looks on your RX side. You=20
are in a good position if you can realise a separated earth and that=20
distance to the house. I would do so as well if i would have the chance.
OK, does that mean you have much lower QRM now due to the transformers?=20
We will see :-)

Also many thanks for the useful information about the core. I found it=20
for 0.99 =80 at=20
http://www.reichelt.de/Amidon-Doppellochkerne/BN-73-202/3/index.html?;ACT=
ION=3D3;LA=3D2;ARTICLE=3D32314;GROUPID=3D3188;artnr=3DBN+73-202;SID=3D32f=
Rwi5qwQASAAACIkJWk502917f27b61570f9f85c5c030e3f831

That gives me new motivation to start some new tests and experiments :-)

Thank you for running the PC for a longer time. I will then make a plot=20
over 24 hours soon. Will be interesting.

73, Stefan/DK7FC

Am 05.09.2012 19:48, schrieb Lee Hudson:
> Hi Stefan,
>
> Setup here is fairly straight forward.
> MiniWhip @ 5m height, 12m away from the house. RX is a Perseus.
>
> QTH is on the southern edge of Harrogates residential area.
>
> Noise level here is actually quite high. Most of which is radiated from=
 the
> house wiring. I've experimented with various ways of reducing this nois=
e
> over the last 4 years and the best seems to be isolating the main feede=
r at
> both ends. The Miniwhip is powered via a solar charged battery and a go=
od
> earth at its base. The difference with and without the above is 20dB! T=
his
> makes the difference between hearing nothing, and almost everything HI!
>
> Isolation transformers are 7 bifilar turns on a BN-73-202 core.
>
> Since you are plotting consistent data, please ignore any reports from =
last
> night as one of the isolators was in use on another project. Those rece=
ived
> during the daytime today and forward are OK.
>
> I shall leave everything running so you can gather as much data as you =
need.
>
> 73,
> Lee M0LMH.
>
>
> -----Original Message-----
> From: owner-rsgb_lf_group@blacksheep.org
> [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Stefan Sch=E4f=
er
> Sent: 05 September 2012 16:38
> To: rsgb_lf_group@blacksheep.org
> Subject: Re: LF: MF acty
>
>
> Am 05.09.2012 17:19, schrieb Stefan Sch=E4fer:
>   =20
>> [...]but as soon as the sunrise comes, no signals are detected in the
>> UK while the levels are 25 dB above the decode limit in the night.
>>     =20
> Ehm, no, i've concentrated to much on the plot of G0KTN while writing
> that. M0LMH even get's daytime decodes on the lower limit, maybe having
> a somehow better RX-system+location(?)...
>
> 73, Stefan
>
>
>   =20