Message-ID: <4DC70AD5.7030102@iup.uni-heidelberg.de>
Date: Sun, 08 May 2011 23:27:49 +0200
From: =?UTF-8?B?U3RlZmFuIFNjaMOkZmVy?= <schaefer@iup.uni-heidelberg.de>
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To: rsgb_lf_group@blacksheep.org
References: <4DC65644.701@talktalk.net>  <4DC6D9DA.3080801@dsl.pipex.com> <1304888225.1662.27.camel@gerhard-desktop>
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Subject: Re: LF: ZEVS transmission at 1800BST
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Hello Chris, Gerhard, ELF,

I've also seen a stable trace at 82 Hz but not the frequency shifting 
transmission before. For some reasons there are various QRM levels here 
and i don't know the origin. Never mind and interesting to see something 
at all. Would be interesting to see what can be achieved with an ELF 
optimised crcuit...

My SL settings include a 700 Hz LPF and the noiseblanker afterwards, 
using the usual VLF settings. The width of one FFT bin is at 11 mHz and 
the scroll rate is 1 pix/minute which seems to be a bit to slow. I will 
change to 30 sec/pix soon. I've switched on the "Paul Nicholsons hum 
filter" and set the hum frequency to 16 2/3 Hz to remove 50 Hz and 16 
2/3 Hz harmonics of the German train power grid.

Maybe a simple mains transformer allows a simple way to realise a LPF?

73, Stefan/DK7FC

Am 08.05.2011 22:57, schrieb Gerhard Hickl:
> Hi Chris, LF!
>
> Very interesting....I'm also using Stefan's E-probe and on 9khz ist's
> very sensitive. My probe is more than 15m above ground and I'm also
> trying to receive the ZEVS-transmissions. I have the window running
> since a few days but nothing on screen here in JN88hl....
>
> I'm just using a low-pass filter with 1000Hz -3db point and the
> noise-blanker afterwards. I wonder about your SL-settings.
>
> 73
> OE3GHB
> Gerhard
>
>
>
> Am Sonntag, den 08.05.2011, 18:58 +0100 schrieb Chris Dillon:
>    
>> Hi all - ZEVS transmission starting at 1800 BST received at IO92vf
>> using a 'Stefan' pre-amp with a 1m probe about 3m high.
>> Still transmitting a constant carrier on 82 Hz at 1857 BST. Wonder if
>> they QSL reception reports?!
>>
>> 73 Chris G3WCD
>>
>>
>>
>>
>>
>>
>>
>> On 08/05/2011 09:37, qrss wrote:
>>      
>>> Stefan / LF
>>>
>>> Message commenced 0800UTC.
>>>
>>> Eddie
>>>
>>>
>>>        
>>      
>
>