Message-ID: <4BED46F6.7010100@iup.uni-heidelberg.de>
Date: Fri, 14 May 2010 14:49:58 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3
MIME-Version: 1.0
To: rsgb_lf_group@blacksheep.org
References: <003501caf1fd$9d39a0e0$0401a8c0@xphd97xgq27nyf> <BLU146-W22605D5E5AEF4CD7E144F5CFFB0@phx.gbl> <4BEBEE46.9040702@iup.uni-heidelberg.de> <4BEC496D.3000300@iup.uni-heidelberg.de> <9707328E302D42E38214972B9DC79309@PCCasa>
In-Reply-To: <9707328E302D42E38214972B9DC79309@PCCasa>
Subject: Re: LF: Re: Outdoor test for different places for active E-field
 antennas for VLF
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: quoted-printable
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org


Hello Daniele,

This done by a special TX LED (SFH750V)that is switched into the line=20
(Drain to +) of the second FET of the active antenna.


73, Stefan


Am 13.05.2010 22:42, schrieb Daniele Tincani:
> Hello Stefan,
>
> how do you connect the fiber to the antenna? I mean, how do you=20
> convert from electric to optical?
>
> Cheers
> D.
>
> ----- Original Message ----- From: "Stefan Sch=E4fer"=20
> <Stefan.Schaefer@iup.uni-heidelberg.de>
> To: <rsgb_lf_group@blacksheep.org>
> Sent: Thursday, May 13, 2010 8:48 PM
> Subject: VLF: Outdoor test for different places for active E-field=20
> antennas for VLF
>
>
>> Dear group,
>>
>> Today i checked 3 different places for my VLF grabber antenna. The
>> currently used antenna was not touched. I used a second antenna that
>> uses a fiber optic cable + battery that totally decouples the antenna
>> from the PC (noise!).
>> The first time i cheked the QTH in the 7th floor of the institute. The
>> signal was 20 dB stronger and all local QRM lines are gone!
>>
>> I created a report with many photos and spectrograms to see the
>> difference. First it was thought to be just a notice for me but due to
>> the impressing difference of the received signals i want to share it to
>> other OMs who are working with active E field antennas. Sorry, it is in
>> german language but perhaps you can use a online translator, if you are
>> not german and interested ;-) There are some OMs planning to built an
>> active antenna for VLF and some who have problems or are sceptic about
>> these fiber optic cables. Also some are afraid with antennas connected
>> to the PC, when thunder storms occurr. There, the fiber optic cable is
>> surely a good way to do it, we know.
>> So if you want to take a look, look here:
>> http://www.iup.uni-heidelberg.de/schaefer_vlf/Vergleichstest_Antennenst=
andorte_UNI_HD.pdf=20
>>
>>
>> Wish you a nice weekend and better WX than here ;-)
>>
>> Stefan/DK7FC
>>
>
>
> ------------------------------------------------------------------------=
--------=20
>
>
>
>
> Nessun virus nel messaggio in arrivo.
> Controllato da AVG - www.avg.com
> Versione: 9.0.819 / Database dei virus: 271.1.1/2871 -  Data di=20
> rilascio: 05/13/10 08:26:00
>