Return-Path: X-Spam-DCC: paranoid 1233; 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=-0.7 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_MESSAGE,RATWARE_GECKO_BUILD 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 t9JCofhL027330 for ; Mon, 19 Oct 2015 14:50:41 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Zo9pt-0006Yz-Rg for rs_out_1@blacksheep.org; Mon, 19 Oct 2015 13:46:45 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Zo9pt-0006Yq-FY for rsgb_lf_group@blacksheep.org; Mon, 19 Oct 2015 13:46:45 +0100 Received: from mout01.posteo.de ([185.67.36.65]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.86) (envelope-from ) id 1Zo9op-0000xk-3O for rsgb_lf_group@blacksheep.org; Mon, 19 Oct 2015 13:46:44 +0100 Received: from dovecot03.posteo.de (dovecot03.posteo.de [172.16.0.13]) by mout01.posteo.de (Postfix) with ESMTPS id 00C822096E for ; Mon, 19 Oct 2015 14:45:21 +0200 (CEST) Received: from mail.posteo.de (localhost [127.0.0.1]) by dovecot03.posteo.de (Postfix) with ESMTPSA id 3nfd8x4q5hz5vN9 for ; Mon, 19 Oct 2015 14:45:21 +0200 (CEST) Message-ID: <5624E5E0.806@posteo.de> Date: Mon, 19 Oct 2015 14:45:20 +0200 From: DK7FC 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: <579355A36AEE9D4FA555C45D556003AB1B2290AC@servigilant.vigilant.local> In-Reply-To: <579355A36AEE9D4FA555C45D556003AB1B2290AC@servigilant.vigilant.local> X-Scan-Signature: 94b4899eb522d3cd83a8c4d63d16b91e Subject: Re: LF: EA5DOM going vertical Content-Type: multipart/alternative; boundary="------------020904020105010401020101" 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: 4515 This is a multi-part message in MIME format. --------------020904020105010401020101 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Hi Luis, Nice looking coil. It has a good ratio between diameter and length although it would have been better to have a small gap between the wire turns. And i didn't expect that you need so much L. What is the L of this coil? Looks like 3 mH or so. You will need about 2 mH. But i can't se the actual number of turns. Probably it is just right :-) I would build my own variometer, i.e. drill 2 holes into the tube, add an axis and put another coil on this axis. https://dl.dropboxusercontent.com/u/19882028/MF/20141027_203720.jpg Like this image. Ehm, what you can see there will not happen to you i think. But anyway, be careful with high voltage! Good luck! 73, Stefan Am 19.10.2015 12:52, schrieb VIGILANT Luis Fernández: > Hi Stefan > This is a picture of the coil > 25cm diameter pipe, 90 cm high > https://dl.dropboxusercontent.com/u/7162072/Fotos%20varias/MF/CAM00571.jpg > I can also fit this variometer on the top side of the pipe > https://dl.dropboxusercontent.com/u/7162072/Fotos%20varias/MF/CAM00559.jpg > https://dl.dropboxusercontent.com/u/7162072/Fotos%20varias/MF/CAM00558.jpg > The -3dB of my signals yesterday are probably due to QRN on the Rx. We > had a big storm down in south EA > Another one is predicted for tomorrow just here and strong rain. No > good for installing the coil > 73 de Luis > EA5DOM > > ------------------------------------------------------------------------ > *De:* owner-rsgb_lf_group@blacksheep.org > [mailto:owner-rsgb_lf_group@blacksheep.org] *En nombre de *DK7FC > *Enviado el:* domingo, 18 de octubre de 2015 23:20 > *Para:* rsgb_lf_group@blacksheep.org > *Asunto:* Re: LF: EA5DOM going vertical > > Hi Luis, > > Am 18.10.2015 21:59, schrieb VIGILANT Luis Fernández: >> For the transformer I plan to recycle the one osed for the loop. It >> has two big toroids 80mm external diameter >> and 8mm thick. Both joined make 16mm thick. Unfortunately don't know >> which is the material used > Hm, sounds not optimal, somehow :-) But just start with a 1:1 > transformer and a 50 Ohm dummy load as a first test. If the > transformer stays cold and the load (e.g. power consumption, or > current meter reading of the power supply) is the same with or without > the transformer, everything is fine. > >> >> Can be primary and secondary be wounded one on top of the other ?? > Yes, this is recommended! > >> Tonight reports on my remote monitor are 3dB down. I made a modification >> I have finally connected a wire from top terrace to the fire >> extinguish pipe which runs inside the building down >> to the basements, were pumping system is located. The wire is not yet >> connected to the ground side of the vertical >> BUT the actual radial counterpoise runs parallel to this wire for >> about 5m >> >> Seems like this can be the cause of 3dB looses. > ...but maybe the situation is different when matching the PA properly. > In the moment you don't know at all what the feed point impedance is. > ...and how the PA behaves at that impedance connected. >> Keep tuned ! > RR. GL, > > 73, Stefan --------------020904020105010401020101 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Hi Luis,

Nice looking coil. It has a good ratio between diameter and length although it would have been better to have a small gap between the wire turns. And i didn't expect that you need so much L. What is the L of this coil? Looks like 3 mH or so. You will need about 2 mH. But i can't se the actual number of turns. Probably it is just right :-)
I would build my own variometer, i.e. drill 2 holes into the tube, add an axis and put another coil on this axis.
https://dl.dropboxusercontent.com/u/19882028/MF/20141027_203720.jpg Like this image. Ehm, what you can see there will not happen to you i think. But anyway, be careful with high voltage!

Good luck!

73, Stefan


Am 19.10.2015 12:52, schrieb VIGILANT Luis Fernández:
Hi Stefan
 
This is a picture of the coil
25cm diameter pipe, 90 cm high
 
 
I can also fit this variometer on the top side of the pipe
 
 
The -3dB of my signals yesterday are probably due to QRN on the Rx. We had a big storm down in south EA
 
Another one is predicted for tomorrow just here and strong rain. No good for installing the coil
 
73 de Luis
EA5DOM

De: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] En nombre de DK7FC
Enviado el: domingo, 18 de octubre de 2015 23:20
Para: rsgb_lf_group@blacksheep.org
Asunto: Re: LF: EA5DOM going vertical

Hi Luis,

Am 18.10.2015 21:59, schrieb VIGILANT Luis Fernández:
For the transformer I plan to recycle the one osed for the loop. It has two big toroids 80mm external diameter
and 8mm thick. Both joined make 16mm thick. Unfortunately don't know which is the material used
Hm, sounds not optimal, somehow :-) But just start with a 1:1 transformer and a 50 Ohm dummy load as a first test. If the transformer stays cold and the load (e.g. power consumption, or current meter reading of the power supply) is the same with or without the transformer, everything is fine.


Can be primary and secondary be wounded one on top of the other ??
Yes, this is recommended!
Tonight reports on my remote monitor are 3dB down. I made a modification
I have finally connected a wire from top terrace to the fire extinguish pipe which runs inside the building down
to the basements, were pumping system is located. The wire is not yet connected to the ground side of the vertical
BUT the actual radial counterpoise runs parallel to this wire for about 5m

Seems like this can be the cause of 3dB looses.
...but maybe the situation is different when matching the PA properly. In the moment you don't know at all what the feed point impedance is. ...and how the PA behaves at that impedance connected.
 Keep tuned !
RR. GL,

73, Stefan
--------------020904020105010401020101--