Return-Path: X-Spam-DCC: paranoid 1290; Body=3 Fuz1=3 Fuz2=3 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_30_40,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 tAJJrXZU007904 for ; Thu, 19 Nov 2015 20:53:33 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ZzVDw-0004rl-2s for rs_out_1@blacksheep.org; Thu, 19 Nov 2015 19:50:28 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ZzVDv-0004rc-PC for rsgb_lf_group@blacksheep.org; Thu, 19 Nov 2015 19:50:27 +0000 Received: from mail-wm0-f44.google.com ([74.125.82.44]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.86) (envelope-from ) id 1ZzVD0-0000mL-FH for rsgb_lf_group@blacksheep.org; Thu, 19 Nov 2015 19:50:26 +0000 Received: by wmdw130 with SMTP id w130so254471756wmd.0 for ; Thu, 19 Nov 2015 11:49:14 -0800 (PST) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=1SCFMPQVZxZcLQpVRSNlNDwwbV7+Cc1NsLWNitx2rJM=; b=bD7t14OaGQn1lmlCB8SjsCvvD5hD/RE+jtu2GBN7grTBnjT4xBsg+9XCXeUdVy7MNK wtbOkYxECk5Eh57lhtvfQppSdEIoj0GetUUqLRRtxfJDdrqelMLoCf+y0D6dN2SVWorx SJPDNayns+7fGjH8DbWAEgJr9/7uXJqCA1v6FQd5njOtu8UiUAzC+wx87l7VjEJHJXu3 NAo+B7UEKyQRpY0uRSV6x/m/UMK3DKyT5KrfMGDM97prVC+MnZSQg+RxVP+NPj8W6QR0 vk5Zp30z1MM8t/ms7MFs9L2w7M1Tp/kk8TwkMWI0nX5RbKTeWAY7CGu51ZqEhr24O32Q 0skQ== MIME-Version: 1.0 X-Received: by 10.194.95.202 with SMTP id dm10mr10499377wjb.56.1447962554076; Thu, 19 Nov 2015 11:49:14 -0800 (PST) Received: by 10.28.130.139 with HTTP; Thu, 19 Nov 2015 11:49:13 -0800 (PST) In-Reply-To: <385623502.20151119194008@chriswilson.tv> References: <1729369062.20151119120030@chriswilson.tv> <1C735FA296594DF897C48882843B0EB7@gnat> <564DD9F0.3020005@posteo.de> <564DDE76.6010403@vsas.de> <1242998235.20151119145225@chriswilson.tv> <564DF235.90008@posteo.de> <7E7DFBB4D102A04DB5ADC88D66628A4A44476711@ICTS-S-MBX1.luna.kuleuven.be> <385623502.20151119194008@chriswilson.tv> Date: Thu, 19 Nov 2015 19:49:13 +0000 Message-ID: From: Andy Talbot To: rsgb_lf_group@blacksheep.org X-Scan-Signature: 11963a33d604c33786d8f1de94ce267f Subject: Re: Re[2]: LF: Re: Antenna relays Content-Type: multipart/alternative; boundary=047d7bb042feaf15650524ea0da5 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: 5199 --047d7bb042feaf15650524ea0da5 Content-Type: text/plain; charset=UTF-8 One double pole changeover (six contact terminals in total) OR Two double pole single throw OR or four SPST OR or two SPDT All assuming a single set of contacts will hold off your LF antenna volts 'jnt On 19 November 2015 at 19:40, Chris Wilson wrote: > Hello Rik, > > Thursday, November 19, 2015 > > > Whilst you experts argue the technical niceties of the challenge, let > me ask what might be a simple question to you guys. What is the > minimum number of two contact vac relays I would need to go from > strapped ladder line to top of loading coil, to unstrapped ladder > line, disconnected from the top of the coil, and now connected to my > coaxial feed line, presumably itself disconnected from ground and the > bottom of the loading coil? It seems a lot would be needed to me.... > :( Thanks! I can see me leaving wet weather gear by the front door and > doing this manually! > > > > Hello Stefan, > > > I am not sure a (lossless) capacitor in parallel with the coil will > lower the antenna efficiency. > > I would assume that it will affect the antenna impedance as seen > > from the TX, but will not change the ratio Rrad/Rloss (what > > determines the antenna effeciency). > > > 73, Rik ON7YD > > > > > > > -- > Best regards, > Chris 2E0ILY mailto:chris@chriswilson.tv > > > --047d7bb042feaf15650524ea0da5 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
One double pole changeover (six contact terminals in total= ) =C2=A0OR
Two double pole single throw =C2=A0OR
or four SPST= =C2=A0OR
or two SPDT

All assuming a sin= gle set of contacts will hold off your LF antenna volts

'jnt



On 19 November 2015 at 19:40, Chris = Wilson <chris@chriswilson.tv> wrote:
Hello Rik,

Thursday, November 19, 2015


Whilst you experts argue the technical niceties of the challenge, let
me ask what might be a simple question to you guys. What is the
minimum number of two contact vac relays I would need to go from
strapped ladder line to top of loading coil, to unstrapped ladder
line, disconnected from the top of the coil, and now connected to my
coaxial feed line, presumably itself disconnected from ground and the
bottom of the loading coil? It seems a lot would be needed to me....
:( Thanks! I can see me leaving wet weather gear by the front door and
doing this manually!


> Hello Stefan,

> I am not sure a (lossless) capacitor in parallel with the coil will lo= wer the antenna efficiency.
> I would assume that it will affect the antenna impedance as seen
> from the TX, but will not change the ratio Rrad/Rloss (what
> determines the antenna effeciency).

> 73, Rik=C2=A0 ON7YD






--
Best regards,
=C2=A0Chris=C2=A0 2E0ILY=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 mailto:chris@chriswilson.tv



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