Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id w5T68npj022464 for ; Fri, 29 Jun 2018 08:08:52 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1fYmLZ-0002pN-Qk for rs_out_1@blacksheep.org; Fri, 29 Jun 2018 06:53:29 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1fYmLU-0002pE-9S for rsgb_lf_group@blacksheep.org; Fri, 29 Jun 2018 06:53:24 +0100 Received: from mail-ed1-x52b.google.com ([2a00:1450:4864:20::52b]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.91_59-0488984) (envelope-from ) id 1fYmLQ-0002Uc-OW for rsgb_lf_group@blacksheep.org; Fri, 29 Jun 2018 06:53:23 +0100 Received: by mail-ed1-x52b.google.com with SMTP id r17-v6so6484820edo.13 for ; Thu, 28 Jun 2018 22:53:20 -0700 (PDT) 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=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=qb2fkZJT7iYkq4pZQGXFwHsbWmUpZZg3DVWcTJdBo6w=; b=YGwpjDL897Ph3pti+3+3WvmwKroItoW5N3UOKbjsKrNue/SvG7gG2Uj/0TfbRi6+o/ 00wDi8NJftklKxtcONb/aPN/jl1jYyFyppp076+INbTMSlUW68FmWiNrh6DWC6YKBxeC wpp5eqHDttiNIgra2RlnIKw3RFXUKVCmkxW+OBA/9GMM7tf8bfcrn78UVNOKq6oYwh8C izkoHRjMb4VOK11B9l7LC7PcpHPQBPG/j0crKFKYT0imk/rGprE9jnTiBCRqHAQCfhSd yV+o+r3VZKixPYRugIvg+c1qYWP0WdyC2PiYTEufblKIB2VEGmGAPsBqT1aBDYt8RgdS 1zmw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=qb2fkZJT7iYkq4pZQGXFwHsbWmUpZZg3DVWcTJdBo6w=; b=CwSdGND766goFXvlu8MzksyMoAyYRM4SwWP5OB+enqRCMEZ3PTvlGAQgBuLvhVtzV1 MaT+7obE9cuNMRfiOm+wVkhDOtu7id7t4R2Uv7snDcx1OF+ANx0S4rjN8jqx2GBwNy6S rVSYwT9KUCWWMSSVtuw46u9MJz0uufWg3KgFBV4dbhGLmvgHusNQQez0K3r+21qfY/aK +K4Z1wJDAkXpq8InihtNfam9q8xk86Tbz0csvLd5wds5TgtXtRQ9iqwFGnVywtChEenO eBcLujPAsdUo2cFtEZyX9Ldf7DBGElnaXRqaCMrWBIvLsJtBY1BNEnD9OcLzzDunqM9k nfBw== X-Gm-Message-State: APt69E1XrVyTVmhQtk3+sWg5ypKRnFsceoFJ5cStvMQo7TocQaC/RSSw ZyDlcHbCI2UwyPWiGh7VCh6i+yVc0Ccw/+ylWAc= X-Google-Smtp-Source: AAOMgpeQKECg4wT1aP01yznPQ0cXepdFnl3HRVdKPxGeww4Rs8sfvKn9UVscYwiLlvDLjVcvrabL2QwIZ7hsdxhWyQ0= X-Received: by 2002:a50:d5ce:: with SMTP id g14-v6mr11775359edj.307.1530251598664; Thu, 28 Jun 2018 22:53:18 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:a50:9626:0:0:0:0:0 with HTTP; Thu, 28 Jun 2018 22:53:18 -0700 (PDT) In-Reply-To: <062AA646-1868-4A2E-8974-0B22C24248CB@talktalk.net> References: <319563372.20180628161811@gmail.com> <5B3512D8.7080006@posteo.de> <8410734267.20180628200411@gmail.com> <062AA646-1868-4A2E-8974-0B22C24248CB@talktalk.net> From: Andy Talbot Date: Fri, 29 Jun 2018 06:53:18 +0100 Message-ID: To: LineOne X-Spam-Score: 1.0 (+) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see @@CONTACT_ADDRESS@@ for details. Content preview: Mal ... Did you not read the requirement properly? It was for RECEIVE only. So loss is of no consequence AND he wants to listen on two receivers simultaneously, so switching is not an option. [...] Content analysis details: (1.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [2a00:1450:4864:20:0:0:0:52b listed in] [list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (andy.g4jnt[at]gmail.com) -0.0 SPF_PASS SPF: sender matches SPF record 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid 1.0 FREEMAIL_REPLY From and body contain different freemails X-Scan-Signature: bc223f74149f392a7d9f3881f05f1e70 Subject: Re: LF: Can I match 2 frequencies with one loading coil? Content-Type: multipart/alternative; boundary="000000000000f497ff056fc17674" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_20_30, HTML_FONTCOLOR_UNSAFE,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 --000000000000f497ff056fc17674 Content-Type: text/plain; charset="UTF-8" Mal ... Did you not read the requirement properly? It was for RECEIVE only. So loss is of no consequence AND he wants to listen on two receivers simultaneously, so switching is not an option. Andy www.g4jnt.com On 28 June 2018 at 22:16, Mal Hamilton wrote: > Andy > Your method too lossy and complicated, interaction etc > Use one coil for each band and switch between them for the desired > Band > G3KEV > > > On 28 Jun 2018, at 20:32, Andy Talbot wrote: > > Try this, but you'll have to adjust iteratively: > Bands referred to as LF and MF > > First make your LF loading coil so it resonates the antenna as it stands. > Now make an MF loading coil. The problem is that t=when both are > connected to the antenna teh lower value MF one shunts teh LF. So add > series C to the MF one to make a series tuned circuit, increasing the L to > keep the system at resonance. The net effect now, at LF will be an > increased value of X shunting it. As your additional C reduces and L > increases, the residual at LF across the LF coil goes up. Now adjust teh > LF colil to bring it to resonance, then go back and redo the MF L or C. > Iterating between teh two until they both go. > > I'ts a complicated setup, with two frequencies and three variables to play > with - so an infinite set of values to end up with, but if I were doing it, > I'd make up a spreadsheet and play around with values until a workable > solution that resonated both antennas was found and looked OK. Once > resonated you can bring them to a match if needed. But on Rx just > resonating them ought to suffice > > Or use a circuit analysis prog. > > Andy > www.g4jnt.com > > > On 28 June 2018 at 20:04, Chris Wilson wrote: > >> >> >> Hello Mal, >> >> Thanks Mal and Stefan, but Mal, I want to listen to and decode both bands >> at the same time on 2 different receivers, sharing the one antenna. I >> tried shorting out the loading coil but LF reception is much poorer. >> Not sure how much of an effect no loading coil has at MF ,but suspect >> a loading coil to resonate would be pretty helpful? >> >> Thursday, June 28, 2018, 7:55:55 PM, you wrote: >> >> > I use aircore loading and matching >> > Use 2 coils and SW between them for desired band >> > G3KEV >> >> >> >> >> >> >> >> -- >> Best regards, >> Chris mailto:dead.fets@gmail.com >> >> >> > --000000000000f497ff056fc17674 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Mal ...

Did you not read the= requirement properly?

It was for RECEIVE only.=C2= =A0 So loss is of no consequence
AND
he wants to listen= on two receivers simultaneously, so switching is not an option.
=



On 28 June 2018 at 22:16, Mal Hamilton <g3kevmal@talktalk.net> wrote:
Andy
Your method too lossy = and complicated, interaction etc
Use one coil for each band and s= witch =C2=A0between them for the desired=C2=A0
Band=C2=A0
G3KEV


On 28 Jun 2018= , at 20:32, Andy Talbot <andy.g4jnt@gmail.com> wrote:

Try this, but you'll have to adjust iteratively:
Bands ref= erred to as LF and MF

First make your LF loading c= oil so it resonates the antenna as it stands.=C2=A0 =C2=A0 Now make an MF l= oading coil.=C2=A0 The problem is that t=3Dwhen both are connected to the a= ntenna teh lower value MF one shunts teh LF.=C2=A0 So add series C to the M= F one to make a series tuned circuit, increasing the L to keep the system a= t resonance.=C2=A0 =C2=A0The net effect now, at LF will be an increased val= ue of X shunting it.=C2=A0 As your additional C reduces and L increases, th= e residual at LF across the LF coil goes up.=C2=A0 =C2=A0 Now adjust teh LF= colil to bring it to resonance, then go back and redo the MF L or C.=C2=A0= Iterating between teh two until they both go.

I&#= 39;ts a complicated setup, with two frequencies and three variables to play= with - so an infinite set of values to end up with, but if I were doing it= , I'd make up a spreadsheet and play around with values until a workabl= e solution that resonated both antennas was found and looked OK.=C2=A0 Once= resonated you can bring them to a match if needed.=C2=A0 =C2=A0But on Rx j= ust resonating them ought to suffice

Or use a circ= uit analysis prog.=C2=A0 =C2=A0 =C2=A0


On 28 June 2018 at 20:04, Chris Wilson <d= ead.fets@gmail.com> wrote:
=

Hello Mal,

Thanks Mal and Stefan, but Mal, I want to listen to and decode both bands at the same time on 2 different receivers, sharing the one antenna. I
tried=C2=A0 shorting out the loading coil but LF reception is much poorer.<= br> Not=C2=A0 sure how much of an effect no loading coil has at MF ,but suspect=
a loading coil to resonate would be pretty helpful?

Thursday, June 28, 2018, 7:55:55 PM, you wrote:

> I use aircore loading and matching
> Use 2 coils and SW between them for desired band
> G3KEV







--
Best regards,
=C2=A0Chris=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 =C2=A0 mailto:dead.fets@gmail.com




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