Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: * X-Spam-Status: No, score=1.3 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, HTML_MESSAGE,RCVD_IN_DNSWL_MED,RCVD_IN_SORBS_WEB,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 X-Spam-DCC: : mailn 1480; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u1) with ESMTP id v428sOoq006126 for ; Tue, 2 May 2017 10:54:25 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1d5TVX-0001Ux-J9 for rs_out_1@blacksheep.org; Tue, 02 May 2017 09:50:07 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1d5TVJ-0001Uj-K4 for rsgb_lf_group@blacksheep.org; Tue, 02 May 2017 09:49:53 +0100 Received: from gmy2-mh809.smtproutes.com ([94.186.192.138]) by relay1.thorcom.net with esmtp (Exim 4.89) (envelope-from ) id 1d5TVG-0007XS-EJ for rsgb_lf_group@blacksheep.org; Tue, 02 May 2017 09:49:52 +0100 X-Katharion-ID: 1493714980.53486.gmy2-mh809 Received: from servigilant.vigilant.es ([85.60.35.36]) by gmy2-mh809.smtproutes.com [(94.186.192.138)] with ESMTP via TCP (TLSv1/TLS_RSA_WITH_AES_256_CBC_SHA); 02 May 2017 08:49:40 +0000 Received: from servigilant.vigilant.local ([fe80::c40d:8140:d722:5448]) by servigilant.vigilant.local ([fe80::c40d:8140:d722:5448%13]) with mapi id 14.03.0123.003; Tue, 2 May 2017 10:49:08 +0200 From: =?iso-8859-1?Q?VIGILANT_Luis_Fern=E1ndez?= To: "rsgb_lf_group@blacksheep.org" Thread-Topic: LF: SL settings for EbNaut FFT recording ? Thread-Index: AQHSwYvPGRMSdbVf3ESd6lc1832zK6Hds2oAgACLhpWAAVhxgIABGvLA Date: Tue, 2 May 2017 08:49:08 +0000 Message-ID: <579355A36AEE9D4FA555C45D556003AB8FDD6283@servigilant.vigilant.local> In-Reply-To: <59076C4D.1020608@posteo.de> Accept-Language: es-ES, en-US Content-Language: es-ES X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [192.168.0.2] MIME-Version: 1.0 X-Scan-Signature: 3df6620ae1cf83b986cf2fc02407da16 Subject: RE: LF: SL settings for EbNaut FFT recording ? Content-Type: multipart/alternative; boundary="_000_579355A36AEE9D4FA555C45D556003AB8FDD6283servigilantvigi_" X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Scanned-By: MIMEDefang 2.75 Status: RO X-Status: X-Keywords: X-UID: 11559 --_000_579355A36AEE9D4FA555C45D556003AB8FDD6283servigilantvigi_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Stefan, VLF And thank you for your all your comments and advices :-) I was already running an SL instance showing the first 24KHz in a fast way = to get an idea of what's going on with QRM and known signals It is already included in the grabber at 1 min/pixel. Hour changed to UTC j= ust now https://ea5dom.ure.es/grabber/index.html As you can see, there is a LOT of noise around. What I'm using is your VLF = E-Field probe with the first JFet separated in a 50cm aluminium rod probe and linking to shack with a coax cable https://sites.google.com/site/sub9kh= z/antennas/dk7fc_efield_probe.jpg?attredirects=3D0 Y placed this antenna in the same pole as MiniWhip. So MiniWhip and the VLF= probe are parallel and quite close on top This increased the noise floor in the MiniWhip and probably is not too good= for the VLF probe either. Next is to separate it in an independent isolate= d mast As you can see, signals from Alphas are very weak. I will try also with a l= oop to see if I can get more signal and less noise Obviously, no clear trace from your last transmission in the 31mHz spectrog= ram with this Rx conditions Yes. EbNaut is the last step. But could not resist to try ;-) Can you generate your own test signal on the MF antenna in 7 km distance? I= t should be possible to see a few 100V put on the TX antenna, so it is wort= h to experiment a bit. Maybe a microwave transformer from ebay or so. SpecL= ab can generate the tone/frequency. Use an available audio PA to drive the = transformer, carefully. Could become your first DX on VLF! :-) At the moment what I did is to use a local generator and could see the trac= e at 8270 by coupling a wire over the second JFet. An even that was not eas= y ! :-)))) So, 7Km is an outstanding Dx at this moment. But really challenging I do already have a failed microwave oven to use the transformer. And the a= udio PA too. So you mean to apply the high voltage to the antenna without resonating coil, right ? carefully Nice therm. Don't know if the pipe running down to ground would have any is= sue with this. At the moment 80w at MF didn't show to be harmful But there can be some noise at 8KHz and this would really be an annoying si= de effect if that happens :( The resonating coil for VLF is in the "To-Do" list. Actually found a huge p= lastic (resin) garden flowerpots which are 60cm diameter by 35cm high This can be stacked upside down leaving airgap between them for ventilation= . Just adding one final on top with no coil serves as rain protection of the full arrange. But first is the LF PA, which I had postponed for too = long, I'm afraid 73 de Luis EA5DOM --_000_579355A36AEE9D4FA555C45D556003AB8FDD6283servigilantvigi_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Stefan, VLF
 
And thank you for your all your c= omments and advices :-)
 
I was already running an SL insta= nce showing the first 24KHz in a fast way to get an idea of what's going on= with QRM and known signals
It is already included in the gra= bber at 1 min/pixel. Hour changed to UTC just now
 
As you can see, there is a LOT of= noise around. What I'm using is your VLF E-Field probe with the first JFet= separated in a 50cm aluminium rod probe
 
Y placed this antenna in the same= pole as MiniWhip. So MiniWhip and the VLF probe are parallel and quite clo= se on top
This increased the noise floor in= the MiniWhip and probably is not too good for the VLF probe either. Next i= s to separate it in an independent isolated mast
As you can see, signals from Alph= as are very weak. I will try also with a loop to see if I can get = ;more signal and less noise
Obviously, no clear trace from yo= ur last transmission in the 31mHz spectrogram with this Rx conditions
 
Yes. EbNaut is the last step. But= could not resist to try ;-)
 
Can you = generate your own test signal on the MF antenna in 7 km distance? It should= be possible to see a few 100V put on the TX antenna, so it is worth to exp= eriment a bit. Maybe a microwave transformer from ebay or so. SpecLab can generate the tone/frequency. Use an available= audio PA to drive the transformer, carefully. Could become your first DX o= n VLF! :-)

At the moment what I did = is to use a local generator and could see the trace at 8270 by coupling a w= ire over the second JFet. An even that was not easy ! :-))))
So, 7Km is an outstanding Dx at t= his moment. But really challenging 
 
I do already have a failed microwave oven to use the transfo= rmer. And the audio PA too. So you mean to apply the high voltage to the an= tenna
without resonating coil, right ?
 
carefully
Nice therm. Don't know if the pipe running down to ground wo= uld have any issue with this. At the moment 80w at MF didn't show to be har= mful
But there can be some noise at 8KHz and this would real= ly be an annoying side effect if that happens :(
 
The resonating coil for VLF is in the "To-Do" list= . Actually found a huge plastic (resin) garden flowerpots which are 60cm di= ameter by 35cm high
This can be stacked upside down leaving airgap between them = for ventilation. Just adding one final on top with no coil serves as r= ain protection
of the full arrange. But first is the LF PA, which I had pos= tponed for too long, I'm afraid
 
73 de Luis
EA5DOM
 
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