Message-ID: <4EB7193B.3030305@iup.uni-heidelberg.de>
Date: Mon, 07 Nov 2011 00:33:15 +0100
From: =?ISO-8859-15?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: Arcing...
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Hello Wolf,

In fact it is for our ozone monitor ;-) I haven't seen peaks due to my=20
transmissions though. And the monitor in on a research trip on a ship=20
somewhere in the world since a week. However i have seen my transmission=20
in the graph of global radiation, see=20
http://dl.dropbox.com/u/19882028/IPGRad.jpg This must be due to an EMC=20
problem of course ;-)
But today i spent a lot of time to stop the EMC problem by adding some=20
Ls and Cs on the right place. These are now LP filtering the 137 kHz=20
component in the mains supply and a larger L (15 turns on a 50VA mains=20
transformer core) to reduce the current peaks coming from rectifying the=20
mains directly and feeding this to 2x820 uF. Seems to work very well=20
since my both QRSS-120 transmissions of this evening are completely=20
invisible now!

73, Stefan

Am 06.11.2011 21:50, schrieb wolf_dl4yhf:
> At least the arc has burnt the cobwebs ;-)
>
> Hope the stainless steel tubing (with the laboratory clamps) in the=20
> background are not the intake of an air-pollution monitor. If it was,=20
> it may ring an alarm due to a sudden NOx increase..
>
> Nice pictures with the Nikon D700 !
>
> Cheers,
>    Wolf .
>
> Am 06.11.2011 20:51, schrieb Stefan Sch=E4fer:
>> Seems i need some improvements on the spark gap of my LF antenna.=20
>> Depending on the humidity and wind there is some arcing during the=20
>> transmissions. These look very fascinating i find. Anyway i have to=20
>> add a spherical electrode there and increase the gap distance,=20
>> especially for VLF ;-)
>>
>> A working colleague of me is a (semi) proffessional photographer=20
>> (hobby) and i asked him to take some nice pictures. He has an=20
>> excellent equipment i find but he means he should have taken a=20
>> different lens for these pictures. Anyway, i really like them.
>> When arcing at the ends of a LF antenna is discussed, sometimes a=20
>> picture can help a newcomer what is meant. Here are some more=20
>> examples, in high resolution (abt. 3 MB each)
>>
>> http://dl.dropbox.com/u/19882028/LF/20111106-19h54m07s-FF7_8461.jpg
>> http://dl.dropbox.com/u/19882028/LF/20111106-19h58m31s-FF7_8466.jpg
>> http://dl.dropbox.com/u/19882028/LF/20111106-20h02m13s-FF7_8470.jpg
>> http://dl.dropbox.com/u/19882028/LF/20111106-20h03m58s-FF7_8472.jpg
>>
>> 73, Stefan/DK7FC
>>
>>
>>
>