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[195.171.43.25]) by mx.google.com with ESMTP id wp2si5618559wjc.153.2013.11.08.14.12.36 for ; Fri, 08 Nov 2013 14:12:37 -0800 (PST) Received-SPF: neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) client-ip=195.171.43.25; Authentication-Results: mx.google.com; spf=neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) smtp.mail=owner-rsgb_lf_group@blacksheep.org Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1VetqG-0000kQ-Lf for rs_out_1@blacksheep.org; Fri, 08 Nov 2013 21:43:48 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1VetqG-0000kH-0k for rsgb_lf_group@blacksheep.org; Fri, 08 Nov 2013 21:43:48 +0000 Received: from rhcavuit02.kulnet.kuleuven.be ([134.58.240.130] helo=cavuit02.kulnet.kuleuven.be) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1VetqD-0002zv-E5 for rsgb_lf_group@blacksheep.org; Fri, 08 Nov 2013 21:43:46 +0000 X-KULeuven-Envelope-From: rik.strobbe@fys.kuleuven.be X-KULeuven-Scanned: Found to be clean X-KULeuven-ID: BE0DD128046.A4BB1 X-KULeuven-Information: Katholieke Universiteit Leuven Received: from icts-p-smtps-2.cc.kuleuven.be (icts-p-smtps-2e.kulnet.kuleuven.be [134.58.240.34]) by cavuit02.kulnet.kuleuven.be (Postfix) with ESMTP id BE0DD128046 for ; Fri, 8 Nov 2013 22:43:43 +0100 (CET) Received: from ICTS-S-HUB1.luna.kuleuven.be (icts-s-hub1.luna.kuleuven.be [10.112.9.15]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by icts-p-smtps-2.cc.kuleuven.be (Postfix) with ESMTPS id B9E0F2004C for ; Fri, 8 Nov 2013 22:43:43 +0100 (CET) Received: from ICTS-S-MBX1.luna.kuleuven.be ([fe80::edaf:341f:90e:f70e]) by ICTS-S-HUB1.luna.kuleuven.be ([fe80::f5f7:d8cc:bee0:28d3%26]) with mapi id 14.03.0158.001; Fri, 8 Nov 2013 22:43:43 +0100 X-Kuleuven: This mail passed the K.U.Leuven mailcluster From: Rik Strobbe To: "rsgb_lf_group@blacksheep.org" Thread-Topic: LF: remote antenna tuning Thread-Index: AQHO3HCUCD1oahz2q0ikAFZZ4yK07pobS52AgAASlqCAABILgIAAKgUAgAADwoCAAB5SXIAAAJ0AgAAhDZw= Date: Fri, 8 Nov 2013 21:43:42 +0000 Message-ID: <7E7DFBB4D102A04DB5ADC88D66628A4A0FC99DB9@ICTS-S-MBX1.luna.kuleuven.be> References: <7E7DFBB4D102A04DB5ADC88D66628A4A0FC908D5@ICTS-S-MBX2.luna.kuleuven.be>,<527CEE11.8070509@iup.uni-heidelberg.de> <7E7DFBB4D102A04DB5ADC88D66628A4A0FC98037@ICTS-S-MBX1.luna.kuleuven.be> <527D0CCB.6090208@iup.uni-heidelberg.de> <527D300A.7000909@aol.com>,<527D3331.7080109@iup.uni-heidelberg.de> <7E7DFBB4D102A04DB5ADC88D66628A4A0FC99935@ICTS-S-MBX1.luna.kuleuven.be>,<527D4D24.4070309@tiscali.co.uk> In-Reply-To: <527D4D24.4070309@tiscali.co.uk> Accept-Language: nl-BE, en-GB, en-US Content-Language: nl-BE X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.112.13.13] MIME-Version: 1.0 X-HELO-Warning: Remote host 134.58.240.130 (rhcavuit02.kulnet.kuleuven.be) used invalid HELO/EHLO cavuit02.kulnet.kuleuven.be - verification failed X-Spam-Score: -0.7 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hello Gary, Graham, Dave, thanks for the info. I will build the MBMU tuning meter. 73, Rik ON7YD - OR7T [...] Content analysis details: (-0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [134.58.240.130 listed in list.dnswl.org] -0.0 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: ae3221d431bd19e5880aa98eda07ece4 Subject: RE: LF: remote antenna tuning Content-Type: multipart/alternative; boundary="_000_7E7DFBB4D102A04DB5ADC88D66628A4A0FC99DB9ICTSSMBX1lunaku_" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,HTML_MESSAGE, TO_ADDRESS_EQ_REAL autolearn=no version=2.63 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 Status: O X-Status: X-Keywords: X-UID: 1757 --_000_7E7DFBB4D102A04DB5ADC88D66628A4A0FC99DB9ICTSSMBX1lunaku_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello Gary, Graham, Dave, thanks for the info. I will build the MBMU tuning meter. 73, Rik ON7YD - OR7T ________________________________ Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org= ] namens Gary - G4WGT [g4wgt@tiscali.co.uk] Verzonden: vrijdag 8 november 2013 21:44 Aan: rsgb_lf_group@blacksheep.org Onderwerp: Re: LF: remote antenna tuning Hi Rik, Yes, I used the M0BMU LF Tuning meter for some while on LF & MF with excell= ent results. But now I use a Scopematch slightly modified to switch to the = current sensor mode of the LF Tuning meter. See this page & the following page :- http://myweb.tiscali.co.uk/wgtaylor/LF%20&%20MF%20Experiments%2013.html Click on the pictures to enlarge. So with the Scopematch feature I can get the resonance, voltage & current p= hase spot on visually on my double beam 'scope or switch to measure the ant= enna current from which I can estimate my ERP. The Scopematch is placed (in the shack) at the Tx output after the LPF, I h= ave also placed it at the base of the antenna & found no major difference. The antenna tuning is carried out with a remote motor controlled from the s= hack. http://myweb.tiscali.co.uk/wgtaylor/LF%20&%20MF%20Experiments%208.html 73, Gary - G4WGT. I On 08/11/2013 19:44, Rik Strobbe wrote: I had a look at the M0BMU LF tuning meter and will built it. Does anyone used it on 475/500 kHz? Maybe the transformers need to be adapt= ed but that should be no real problem. 73, Rik ON7YD - OR7T ________________________________ Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] namens Stefan Sch=E4fer [Stefan.Schaefer@iup.uni-heidelberg.de= ] Verzonden: vrijdag 8 november 2013 19:53 Aan: rsgb_lf_group@blacksheep.org Onderwerp: Re: LF: remote antenna tuning Oh yes, or, a phase meter (M0BMU) and a battery operated variometer motor. = Without an additional cable to the shack. Then the SWR meter in the shack c= onfirms that everything is fine. 73, Stefan Am 08.11.2013 19:40, schrieb pat: Hi All, A suggestion: battery operated tuning device at antenna end and "wireless" = link back to shack. Wireless can operate at a non-interfering frequncy (HF/= VHF/UHF/Optical). 73 On 08/11/13 16:09, Stefan Sch=E4fer wrote: Hi Rik, Am 08.11.2013 16:06, schrieb Rik Strobbe: Hi Stefan, remote tuning of the loading should be done by optimizing SWR (at the TX), = not for maximum RF current. If one keeps that in mind there is no problem. ...which is in agreement with what i said. But once you have matched your antenna to 50 Ohm on resonance and you can o= nly vary the reactive part of the antennas impedance (after doing QSY), the= n you will get the maximum antenna current at best SWR (assuming that Rrad+= Rloss is constant which is not to far from reality). I am not sure if I will keep the remote variometer tuning. It needs some ex= tra wires to the loading coil and I am not sure how long the small DC motor= will function properly with all the rain and frost coming up. Here it holds since more than 2 years for LF now.. 73, Stefan -- 73 de pat g4gvw es gd dx qth nr Felixstowe East Coast UK No virus found in this message. Checked by AVG - www.avg.com Version: 2014.0.4158 / Virus Database: 3629/6818 - Release Date: 11/07/13 --_000_7E7DFBB4D102A04DB5ADC88D66628A4A0FC99DB9ICTSSMBX1lunaku_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hello Gary, Graham, Dave,

 

thanks for the info. I will build the MBMU tuning meter.

 

73, Rik  ON7YD - OR7T

 

Van: owner-rsgb_lf_group@blacksheep.org [o= wner-rsgb_lf_group@blacksheep.org] namens Gary - G4WGT [g4wgt@tiscali.co.uk= ]
Verzonden: vrijdag 8 november 2013 21:44
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: Re: LF: remote antenna tuning

Hi Rik,

Yes, I used the M0BMU LF Tuning meter for some while on LF & MF with ex= cellent results. But now I use a Scopematch slightly modified to switch to = the current sensor mode of the LF Tuning meter.

See this page & the following page :-

http://myweb= .tiscali.co.uk/wgtaylor/LF%20&%20MF%20Experiments%2013.html

Click on the pictures to enlarge.

So with the Scopematch feature I can get the resonance, voltage & curre= nt phase spot on visually on my double beam 'scope or switch to measure the= antenna current from which I can estimate my ERP.

The Scopematch is placed (in the shack) at the Tx output after the LPF, I h= ave also placed it at the base of the antenna & found no major differen= ce.

The antenna tuning is carried out with a remote motor controlled from the s= hack.

http://myweb.= tiscali.co.uk/wgtaylor/LF%20&%20MF%20Experiments%208.html

73, Gary - G4WGT.


I

On 08/11/2013 19:44, Rik Strobbe wrote:

I had a look at the M0BMU LF tuning meter and will built it.

Does anyone used it on 475/500 kHz? Maybe the transformers need to be ad= apted but that should be no real problem.

 

73, Rik  ON7YD - OR7T

 

Van: owner-rsgb_lf_group@blacksheep.org [own= er-rsgb_lf_group@blacksheep.org] namens Stefan Sch=E4fer [Stefan.Schaefer@iup.uni-heidelberg.de]
Verzonden: vrijdag 8 november 2013 19:53
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: Re: LF: remote antenna tuning

Oh yes, or, a phase meter (M0BMU) and a battery operated variometer mo= tor. Without an additional cable to the shack. Then the SWR meter in the sh= ack confirms that everything is fine.

73, Stefan

Am 08.11.2013 19:40, schrieb pat:
Hi All,

A suggestion: battery operated tuning device at antenna end and "wirel= ess" link back to shack. Wireless can operate at a non-interfering fre= quncy (HF/VHF/UHF/Optical).

73






On 08/11/13 16:09, Stefan Sch=E4fer wrote:
Hi Rik,

Am 08.11.2013 16:06, schrieb Rik Strobbe:

Hi Stefan,

 

remote tuning of the loading should be done&nbs= p;by optimizing SWR (at the TX), not for maximum R= F current.

If one keeps that in mind there is no prob= lem.

...which is in agreement with what i said.
But once you have matched your antenna to 50 Ohm on resonance and you can o= nly vary the reactive part of the antennas impedance (after doing QSY), the= n you will get the maximum antenna current at best SWR (assuming that Rrad&= #43;Rloss is constant which is not to far from reality).

I am not sure if I will keep the remote&nb= sp;variometer tuning. It needs some extra wires to the&= nbsp;loading coil and I am not sure how long the&n= bsp;small DC motor will function properly with all= the rain and frost coming up.

Here it holds since more than 2 years for LF now..

73, Stefan



--=20
73 de pat g4gvw
es gd dx
qth nr Felixstowe
East Coast UK

No virus found in this message.
Checked by AVG - www.avg.c= om
Version: 2014.0.4158 / Virus Database: 3629/6818 - Release Date: 11/07/13


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