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[195.171.43.25]) by mx.google.com with ESMTP id h8si1458143wjx.77.2013.11.08.13.28.38 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 1Vest6-0000Nj-Fa for rs_out_1@blacksheep.org; Fri, 08 Nov 2013 20:42:40 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Vest5-0000Na-Mf for rsgb_lf_group@blacksheep.org; Fri, 08 Nov 2013 20:42:39 +0000 Received: from smtpout2.wanadoo.co.uk ([80.12.242.42] helo=smtpout.wanadoo.co.uk) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1Vest3-0002mW-Aj for rsgb_lf_group@blacksheep.org; Fri, 08 Nov 2013 20:42:38 +0000 Received: from AGB ([2.31.68.230]) by mwinf5d17 with ME id n8ib1m00C4y5Hnm038ibo0; Fri, 08 Nov 2013 21:42:36 +0100 Message-ID: <93C6BC6ABEC54EAB82572225047329C1@AGB> From: "Graham" To: References: In-Reply-To: Date: Fri, 8 Nov 2013 20:42:35 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 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: Check on Garys g4wgt web site , the voltage divider was changed for high power 500 work G, From: Dave G3WCB. Sent: Friday, November 08, 2013 8:08 PM To: rsgb_lf_group@blacksheep.org Subject: RE: LF: remote antenna tuning [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [80.12.242.42 listed in list.dnswl.org] 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 14522a7d8bfffcae5e92e35059f18ae1 Subject: Re: LF: remote antenna tuning Content-Type: multipart/alternative; boundary="----=_NextPart_000_0198_01CEDCC3.0E073590" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: ** X-Spam-Status: No, hits=2.1 required=5.0 tests=HTML_30_40,HTML_FONTCOLOR_BLUE, HTML_MESSAGE,MAILTO_TO_SPAM_ADDR,MISSING_OUTLOOK_NAME 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: 3442 This is a multi-part message in MIME format. ------=_NextPart_000_0198_01CEDCC3.0E073590 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Check on Garys g4wgt web site , the voltage divider was changed = for high power 500 work=20 G,=20 From: Dave G3WCB.=20 Sent: Friday, November 08, 2013 8:08 PM To: rsgb_lf_group@blacksheep.org=20 Subject: RE: LF: remote antenna tuning Hi, Rik. I have built Jim's phasemeter and used it on 137 kHz. It seems to work = fine on 475 kHz also, although it seems more sensitive on 475kHz. You = could take the DC output from the phasemeter and feed it back up the = coax to the shack for a remote indication. Or you could use the output = of the phasemeter to control the motor directly. I think that Marcus has = some arrangement like this. 73, Dave G3WCB IO91RM=20 -----Original Message----- From: owner-rsgb_lf_group@blacksheep.org = [mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of Rik Strobbe Sent: 08 November 2013 19:45 To: rsgb_lf_group@blacksheep.org Subject: RE: LF: remote antenna tuning 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 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 confirms that everything is fine. 73, Stefan Am 08.11.2013 19:40, schrieb pat:=20 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:=20 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 --=20 73 de pat g4gvw es gd dx qth nr Felixstowe East Coast UK ------=_NextPart_000_0198_01CEDCC3.0E073590 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Check  on Garys  g4wgt  web site , the  = voltage =20 divider  was  changed  for   high  = power =20 500  work
 
G,

Sent: Friday, November 08, 2013 8:08 PM
Subject: RE: LF: remote antenna tuning

Hi,=20 Rik.
 
I have=20 built Jim's phasemeter and used it on 137 kHz. It seems to work = fine on 475=20 kHz also, although it seems more sensitive on 475kHz. You could take the = DC=20 output from the phasemeter and feed it back up the coax to the = shack for a=20 remote indication. Or you could use the output of the phasemeter to = control the=20 motor directly. I think that Marcus has some arrangement like=20 this.
 
73,=20 Dave G3WCB IO91RM 
-----Original Message-----
From:=20 owner-rsgb_lf_group@blacksheep.org=20 [mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of Rik=20 Strobbe
Sent: 08 November 2013 19:45
To:=20 rsgb_lf_group@blacksheep.org
Subject: RE: LF: remote antenna = tuning

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=20 adapted but that should be no real problem.

 

73, Rik  ON7YD - OR7T

 

Van: owner-rsgb_lf_group@blacksheep.org=20 [owner-rsgb_lf_group@blacksheep.org] namens Stefan Sch=E4fer=20 [Stefan.Schaefer@iup.uni-heidelberg.de]
Verzonden: vrijdag 8 = november 2013 19:53
Aan:=20 rsgb_lf_group@blacksheep.org
Onderwerp: Re: LF: remote = antenna=20 tuning

Oh yes, or, a phase meter (M0BMU) and a battery operated = variometer=20 motor. Without an additional cable to the shack. Then the SWR meter in = the=20 shack confirms that everything is fine.

73, Stefan

Am = 08.11.2013=20 19:40, schrieb pat:=20
Hi All,

A suggestion: battery = operated=20 tuning device at antenna end and "wireless" link back to shack. = Wireless can=20 operate at a non-interfering frequncy=20 (HF/VHF/UHF/Optical).

73






On = 08/11/13=20 16:09, Stefan Sch=E4fer wrote:
Hi Rik,

Am 08.11.2013 16:06, = schrieb Rik=20 Strobbe:=20

Hi Stefan,

 

remote tuning of=20 = the loading should be done by optimizing&nb= sp;SWR=20 (at the TX), not for maximum RF current.

If one keeps that in mind there = is no=20 problem.

...which is in agreement with = what i=20 said.
But once you have matched your antenna to 50 Ohm on = resonance and=20 you can only vary the reactive part of the antennas impedance = (after doing=20 QSY), then you will get the maximum antenna current at best SWR = (assuming=20 that Rrad+Rloss is constant which is not to far from = reality).

I am not sure if I will keep=20 the remote variometer = tuning. It needs some=20 extra wires to the loading coil and=20 I am not sure how long = the small DC=20 motor will function properly with all = the rain=20 and frost coming up.

Here it holds = since more=20 than 2 years for LF now..

73, Stefan



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