Return-Path: X-Spam-DCC: paranoid 1290; Body=3 Fuz1=3 Fuz2=3 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_RCVD_HELO,HTML_MESSAGE,SPF_PASS autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id u3I9vwCn002831 for ; Mon, 18 Apr 2016 11:57:59 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1as5qF-00030t-U9 for rs_out_1@blacksheep.org; Mon, 18 Apr 2016 10:51:39 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1as5qF-00030k-El for rsgb_lf_group@blacksheep.org; Mon, 18 Apr 2016 10:51:39 +0100 Received: from s16315160.onlinehome-server.info ([87.106.80.234] helo=mail.vigilant.es) by relay1.thorcom.net with esmtp (Exim 4.87) (envelope-from ) id 1as5qD-0000of-JK for rsgb_lf_group@blacksheep.org; Mon, 18 Apr 2016 10:51:38 +0100 Received: from servigilant.vigilant.local ([87.216.178.132]) by vigilant.es with MailEnable ESMTP; Mon, 18 Apr 2016 11:51:11 +0200 Received: from servigilant.vigilant.local ([fe80::3cdf:95f8:c1c9:3931]) by servigilant.vigilant.local ([fe80::3cdf:95f8:c1c9:3931%13]) with mapi id 14.03.0123.003; Mon, 18 Apr 2016 11:51:21 +0200 From: =?iso-8859-1?Q?VIGILANT_Luis_Fern=E1ndez?= To: "rsgb_lf_group@blacksheep.org" Thread-Topic: LF: TXing on VLF again, Iron powder cores... broomstick coil? Thread-Index: AQHRmKDaEZrir7GFMU+s9QRoLWl1HZ+ONwfO///ve4CAAUWtoA== Date: Mon, 18 Apr 2016 09:51:20 +0000 Message-ID: <579355A36AEE9D4FA555C45D556003AB53B6DB3E@servigilant.vigilant.local> In-Reply-To: <5713A9B1.30803@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: 6bb858db23df2b82c4f5a8cb512b45b1 Subject: RE: LF: TXing on VLF again, Iron powder cores... broomstick coil? Content-Type: multipart/alternative; boundary="_000_579355A36AEE9D4FA555C45D556003AB53B6DB3Eservigilantvigi_" 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 2.56 on 10.1.3.11 Status: O X-Status: X-Keywords: X-UID: 7778 --_000_579355A36AEE9D4FA555C45D556003AB53B6DB3Eservigilantvigi_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Stefan I don't really like the idea of keeping permanent long wires installed here= . Last summer I had the horizontal loop and we had an small storm. A lighting striked in the area. Not in my building or any o= ther towers around. Probably a few km away That was enought to damage the speed control board for the motor moving the= vacuum capacitor. And also a USB hub was damaged getting some ports faulty Having just two sloppers as top load capacity I can take all the wires down= . They are hanging from the 11m giberglass pole of the (now unused) Ultrabeam vertical antenna using a pulley in the top of= the fiberglass pole. So it is very easy to fold it down like a flag and making it to electrically disappear May be I can use the dynamic antenna as high voltage variable capacitor. Th= e inner conductor is deployed inside the fiberglass and lenght adjusted with a stepping motor. In fact I'm using this to trim t= he antenna at MF. But actually the inner conductor is just floating Even floating, there is a remarkable effect in the resonance of the antenna= . I can connect it to PA ground and make a test The capacitive effect will be higer. As I'm not using high power, hope the = dielectric can deal with some Kv ;-) Some pictures about the small coils used for the VLF test. This was a test = only for antenna analyzer https://dl.dropboxusercontent.com/u/7162072/Fotos%20varias/MF/IMG_20160417_= 122723.jpg And what I got at 10800Hz https://dl.dropboxusercontent.com/u/7162072/Fotos%20varias/MF/Sintonizada%2= 010800Hz%201082mH.bmp This is a "family picture" of the coils.It was taken in MF configuration. O= nly the first L1 coil connected to antenna, which is the wire going up at the right side https://dl.dropboxusercontent.com/u/7162072/Fotos%20varias/MF/MF%20and%20LF= %20coils.jpg 73 de Luis EA5DOM --_000_579355A36AEE9D4FA555C45D556003AB53B6DB3Eservigilantvigi_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Stefan
 
I don't really like the idea of k= eeping permanent long wires installed here. Last summer I had the horizonta= l loop and we had
an small storm. A lighting strike= d in the area. Not in my building or any other towers around. Probably a fe= w km away
That was enought to damage the sp= eed control board for the motor moving the vacuum capacitor. And also a USB= hub was
damaged getting some ports f= aulty
 
Having just two sloppers as top l= oad capacity I can take all the wires down. They are hanging from the = 11m giberglass pole
of the (now unused) Ultrabeam ver= tical antenna using a pulley in the top of the fiberglass pole. So it is ve= ry easy to fold it down
like a flag and making it to elec= trically disappear
 
May be I can use the dynamic ante= nna as high voltage variable capacitor. The inner conductor is deploye= d inside the fiberglass
and lenght adjusted with a steppi= ng motor. In fact I'm using this to trim the antenna at MF. But actually th= e inner conductor is just floating
Even floating, there is a remarka= ble effect in the resonance of the antenna. I can connect it to PA gro= und and make a test
The capacitive effect will be hig= er. As I'm not using high power, hope the dielectric&nb= sp;can deal with some Kv  ;-)
 
Some pictures about the small coi= ls used for the VLF test. This was a test only for antenna analyzer<= /span>
 
And what I got at 10800Hz<= /span>
 
This is a "family picture&qu= ot; of the coils.It was taken in MF configuration. Only the first= L1 coil connected to antenna, which is the wire
going up at the right side=
 
73 de Luis
EA5DOM
 
 
--_000_579355A36AEE9D4FA555C45D556003AB53B6DB3Eservigilantvigi_--