Return-Path: X-Spam-DCC: paranoid 1169; Body=2 Fuz1=2 Fuz2=2 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 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 t59AfWuS008061 for ; Tue, 9 Jun 2015 12:41:33 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Z2GuL-0002WA-A2 for rs_out_1@blacksheep.org; Tue, 09 Jun 2015 11:37:25 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Z2GuL-0002W1-07 for rsgb_lf_group@blacksheep.org; Tue, 09 Jun 2015 11:37:25 +0100 Received: from s16315160.onlinehome-server.info ([87.106.80.234] helo=mail.vigilant.es) by relay1.thorcom.net with esmtp (Exim 4.85) (envelope-from ) id 1Z2GuH-0006o0-AU for rsgb_lf_group@blacksheep.org; Tue, 09 Jun 2015 11:37:23 +0100 Received: from servigilant.vigilant.local ([87.216.178.132]) by vigilant.es with MailEnable ESMTP; Tue, 9 Jun 2015 12:36:43 +0200 Received: from servigilant.vigilant.local ([fe80::3cdf:95f8:c1c9:3931]) by servigilant.vigilant.local ([fe80::3cdf:95f8:c1c9:3931%17]) with mapi id 14.03.0123.003; Tue, 9 Jun 2015 12:37:04 +0200 From: =?iso-8859-1?Q?VIGILANT_Luis_Fern=E1ndez?= To: "rsgb_lf_group@blacksheep.org" Thread-Topic: LF: EA5DOM vertical Thread-Index: AQHQk60gIdlNNJGDVUq2BupjpXflfZ2GLZoAgB3cPGA= Date: Tue, 9 Jun 2015 10:37:03 +0000 Message-ID: <579355A36AEE9D4FA555C45D556003AB1B11415D@servigilant.vigilant.local> In-Reply-To: <8D261D2609C310C-618-5B71@webmail-va171.sysops.aol.com> 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: b45446db24846e84db90eb694609e205 Subject: RE: LF: EA5DOM vertical Content-Type: multipart/alternative; boundary="_000_579355A36AEE9D4FA555C45D556003AB1B11415Dservigilantvigi_" 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 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 3474 --_000_579355A36AEE9D4FA555C45D556003AB1B11415Dservigilantvigi_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi MF I'm back again with is topic While making some calculations for the vertical I recalled Stefan's= comment "If C is 55 pF and your losses are 50 Ohm and the power is 50 W, you will h= ave 6 kV on the antenna" I'm using a Ultrabeam V6-40 vertical antenna. My idea is to use it just con= necting the inner pin of the PL to the loading coil, once removed the actual counterpoise wires for HF band= s. The inner pin of the PL connects with the copper-berilium tape which forms the vertical element of the anten= na. It is rated at 3500W on HF but I'm afraid that it doesn't mean 6KV of RF, but much less voltage on muc= h more antenna current My fear is not for the contact system between copper-berilium tape roll and= the PL but for the stepping motor which moves the tape. Even disconnecting the wires to motor controller, wou= ld it get induced currents in the motor coils and get them QRT ?? I wouldn't like to test it ..... the hard way :-( There is not much information at manufacturer web site http://www.ultrabeam.it/site/index.php?option=3Dcom_content&view=3Darticle&= id=3D4&Itemid=3D27&lang=3Den Probably the safer way would be to retract the original element completely = and use just the fiberglass pole to support a dedicated wire. But would be nice to keep using the retracting= system as original and make it easy to retract it all in case of storms Any ideas wellcome ;-) 73 de Luis EA5DOM --_000_579355A36AEE9D4FA555C45D556003AB1B11415Dservigilantvigi_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi MF
 
I'm back again with is topic
 
While making some calculations for the <crazy> vertica= l I recalled Stefan's comment
"If C is 55 pF and your losses are 50 Ohm and the power is 50 W, you w= ill have 6 kV on the antenna"
 
I'm using a Ultrabeam V6-40 vertical antenna. My idea i= s to use it just connecting the inner pin of the PL
to the loading coil, once removed the actual counterpoise wi= res for HF bands. The inner pin of the PL connects
with the copper-berilium tape which forms the vertical eleme= nt of the antenna. It is rated at 3500W on HF
but I'm afraid that it doesn't mean 6KV of RF, but much less= voltage on much more antenna current
 
My fear is not for the contact system between copper-beriliu= m tape roll and the PL but for the stepping motor
which moves the tape. Even disconnecting the wires to motor = controller, would it get induced currents
in the motor coils and get them QRT ??&n= bsp; 
 
I wouldn't like to test it ..... the hard way :-(
 
There is not much information at manufacturer web site
 
Probably the safer way would be to retract the original elem= ent completely and use just the fiberglass pole
to support a dedicated wire. But would be nice to keep using= the retracting system as original and make
it easy to retract it all in case of storms
 
Any <crazy> ideas wellcome ;-)
 
73 de Luis
EA5DOM
 
 
--_000_579355A36AEE9D4FA555C45D556003AB1B11415Dservigilantvigi_--