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[195.171.43.25]) by mx.google.com with ESMTP id um9si5601676wjc.4.2013.11.08.13.28.37 for ; Fri, 08 Nov 2013 13:28:38 -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 1Vesuz-0000PN-KM for rs_out_1@blacksheep.org; Fri, 08 Nov 2013 20:44:37 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Vesuz-0000PC-1w for rsgb_lf_group@blacksheep.org; Fri, 08 Nov 2013 20:44:37 +0000 Received: from out.ipsmtp3nec.opaltelecom.net ([62.24.202.75]) by relay1.thorcom.net with esmtps (TLSv1:RC4-SHA:128) (Exim 4.77) (envelope-from ) id 1Vesuw-0002nJ-EN for rsgb_lf_group@blacksheep.org; Fri, 08 Nov 2013 20:44:35 +0000 X-SMTPAUTH: g4wgt@tiscali.co.uk X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ApQBAORMfVJYaCZY/2dsb2JhbAANTIJDfIkktkWBR4MZAQEBAwFJHhERCxQECRYPCQMCAQIBRRMGAgEBh3cTqWeTNo4YJnkfGIQwA5k+lAI X-IPAS-Result: ApQBAORMfVJYaCZY/2dsb2JhbAANTIJDfIkktkWBR4MZAQEBAwFJHhERCxQECRYPCQMCAQIBRRMGAgEBh3cTqWeTNo4YJnkfGIQwA5k+lAI X-IronPort-AV: E=Sophos;i="4.93,662,1378854000"; d="scan'208,217";a="66882976" Received: from 88-104-38-88.dynamic.dsl.as9105.com (HELO [192.168.1.2]) ([88.104.38.88]) by out.ipsmtp3nec.opaltelecom.net with ESMTP; 08 Nov 2013 20:44:20 +0000 Message-ID: <527D4D24.4070309@tiscali.co.uk> Date: Fri, 08 Nov 2013 20:44:20 +0000 From: Gary - G4WGT User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:24.0) Gecko/20100101 Thunderbird/24.1.0 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org 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> In-Reply-To: <7E7DFBB4D102A04DB5ADC88D66628A4A0FC99935@ICTS-S-MBX1.luna.kuleuven.be> X-Spam-Score: 0.0 (/) 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: Hi Rik, Yes, I used the M0BMU LF Tuning meter for some while on LF & MF with excellent results. But now I use a Scopematch slightly modified to switch to the current sensor mode of the LF Tuning meter. [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (g4wgt[at]tiscali.co.uk) -0.0 SPF_PASS SPF: sender matches SPF record 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: df2e2c1e83972f6e42eeb17d78e70347 Subject: Re: LF: remote antenna tuning Content-Type: multipart/alternative; boundary="------------000306020801040906020907" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_20_30,HTML_MESSAGE 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: 3441 This is a multi-part message in MIME format. --------------000306020801040906020907 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Hi Rik, Yes, I used the M0BMU LF Tuning meter for some while on LF & MF with excellent 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 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 have 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 shack. 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 > adapted 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 Schäfer > [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 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 >> "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 Schäfer 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 only vary the reactive part of the antennas impedance (after >>> doing QSY), then 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 extra 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 > --------------000306020801040906020907 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit
Hi Rik,

Yes, I used the M0BMU LF Tuning meter for some while on LF & MF with excellent 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 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 have 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 shack.

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 adapted 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 Schäfer [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 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 "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 Schäfer 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 only vary the reactive part of the antennas impedance (after doing QSY), then 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 extra 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


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