Return-Path: X-Spam-DCC: paranoid 1181; 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=-2.4 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, 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 tAJECOIp005258 for ; Thu, 19 Nov 2015 15:12:25 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ZzPrt-0001eD-4O for rs_out_1@blacksheep.org; Thu, 19 Nov 2015 14:07:21 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ZzPrs-0001e4-Oz for rsgb_lf_group@blacksheep.org; Thu, 19 Nov 2015 14:07:20 +0000 Received: from mail-wm0-f41.google.com ([74.125.82.41]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.86) (envelope-from ) id 1ZzPqq-0007XG-Pq for rsgb_lf_group@blacksheep.org; Thu, 19 Nov 2015 14:07:19 +0000 Received: by wmec201 with SMTP id c201so119271930wme.1 for ; Thu, 19 Nov 2015 06:06:03 -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=oU7a29yv6SWJGsaUO8mok4hBx+0ixmY1lf0w4NYH4YM=; b=pwOLSNk/jtkGBB/cGt7jaE+dXUC9GYchzDk5WHeAigNRUSB2inAvzt/5uGmjVUN08l NO/N4tUEQe6nEHdMuYr9bqL7AoZN7O0fu6KXUaj+9j6aOWcZ0fdcMsHm1zlL91T885HU Q/UsvCRQvEkg1xqY9TJ1S6iVjoqd2Pgi7i2R5GA8aYvAd1Bgy1jkwAaQ6s8d6c9t/VYT 2xE7X5wKZBailNHyOe2SYaLdOmr150eoLe2QLoIgJhGo+ToGhWf6J0PKvFY4B1ZFuLNC t18M9mc4DXsa0roEyTm0AXi5Sq2RsuLCHbXwyFOZMJRxoTPMbinPSOVBxY5F0nGRPy9G i/hw== MIME-Version: 1.0 X-Received: by 10.194.78.15 with SMTP id x15mr8467758wjw.144.1447941963809; Thu, 19 Nov 2015 06:06:03 -0800 (PST) Received: by 10.28.130.139 with HTTP; Thu, 19 Nov 2015 06:06:03 -0800 (PST) In-Reply-To: <564DD529.1030403@posteo.de> References: <1729369062.20151119120030@chriswilson.tv> <564DD529.1030403@posteo.de> Date: Thu, 19 Nov 2015 14:06:03 +0000 Message-ID: From: Andy Talbot To: rsgb_lf_group@blacksheep.org X-Scan-Signature: f64a6c8ea7591cecbecc6db95ffdd328 Subject: Re: LF: Antenna relays Content-Type: multipart/alternative; boundary=047d7bfcfd7a688c9e0524e5425a 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: 5176 --047d7bfcfd7a688c9e0524e5425a Content-Type: text/plain; charset=UTF-8 The Vacuum relays that used to be plentiful at rallies may be good enough. They were designed for high power auto ATUs and cpuld certainly withstand many kV. The currents in such ATUs, at teh kW level wold be many amps so they may work. If you can still get them, they were a cylinder, typically 12 - 17mm diameter, about 40 - 50mm long with connection lugs on the side extending over the length of the body Andy G4JNT On 19 November 2015 at 13:56, DK7FC wrote: > Hi Chris, > > I would avoid doing this step. It may be comfortable but it's hard for > most relays to carry RF currents of a few ampere and voltages of a few 10 > kV :-) There may be some vacuum relays though, i don't know. Could be > interesting.... > > 73, Stefan > > Am 19.11.2015 13:00, schrieb Chris Wilson: > >> 19 November 2015 >> >> >> I am currently running a bottom strapped windowed ladder line feeder to >> my horizontal quad loop as the vertical for LF, the loop as the >> capacitive top hat. It means I am unable to use it for HF though. I am >> wondering if I might add a remote switched relay at the bottom of the >> ladder line, so it has two states. One connects my co ax feeder to the >> ladder line with the bottom strapped together. the other opens the >> strap and connects the 2 legs to a balun and then my co as feed line. >> >> Given the voltages involved at LF, what sort of relay would I need to >> be looking at? Thanks. >> >> >> >> >> > > --047d7bfcfd7a688c9e0524e5425a Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
The Vacuum relays that used to be plentiful at rallies may= be good enough. =C2=A0 They were designed for high power auto ATUs and cpu= ld certainly withstand many kV. =C2=A0 The currents in such ATUs, at teh kW= level wold be many amps so they may work.

If you can st= ill get them, they were a cylinder, typically 12 - 17mm diameter, about 40 = - 50mm long with connection lugs on the side extending over the length of t= he body

Andy =C2=A0G4JNT


On 19 November 2015 at 13:5= 6, DK7FC <selberdenken@posteo.de> wrote:
Hi Chris,

I would avoid doing this step. It may be comfortable but it's hard for = most relays to carry RF currents of a few ampere and voltages of a few 10 k= V :-) There may be some vacuum relays though, i don't know. Could be in= teresting....

73, Stefan

Am 19.11.2015 13:00, schrieb Chris Wilson:
19 November 2015


I am currently running a bottom strapped windowed ladder line feeder to
my=C2=A0 horizontal=C2=A0 quad=C2=A0 loop=C2=A0 as=C2=A0 the=C2=A0 vertical= for LF, the loop as the
capacitive=C2=A0 top hat. It means I am unable to use it for HF though. I a= m
wondering if I might add a remote switched relay at the bottom of the
ladder line, so it has two states. One connects my co ax feeder to the
ladder=C2=A0 line=C2=A0 with=C2=A0 the=C2=A0 bottom strapped together. the = other opens the
strap and connects the 2 legs to a balun and then my co as feed line.

Given=C2=A0 the voltages involved at LF, what sort of relay would I need to=
be looking at? Thanks.



=C2=A0 =C2=A0


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