Return-Path: Received: from mtain-me01.r1000.mx.aol.com (mtain-me01.r1000.mx.aol.com [172.29.96.137]) by air-mb04.mail.aol.com (v129.4) with ESMTP id MAILINMB042-a26e4cd679b9269; Sun, 07 Nov 2010 05:04:41 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-me01.r1000.mx.aol.com (Internet Inbound) with ESMTP id C3F3538000121; Sun, 7 Nov 2010 05:04:39 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PF25k-0003DK-Hm for rs_out_1@blacksheep.org; Sun, 07 Nov 2010 10:03:16 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PF25j-0003DB-TO for rsgb_lf_group@blacksheep.org; Sun, 07 Nov 2010 10:03:15 +0000 Received: from mail-iw0-f171.google.com ([209.85.214.171]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PF25g-0003M7-Ud for rsgb_lf_group@blacksheep.org; Sun, 07 Nov 2010 10:03:15 +0000 Received: by iwn38 with SMTP id 38so4260985iwn.16 for ; Sun, 07 Nov 2010 02:03:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type; bh=ff89/GNT/irQbh6J48aYvAZ03jcBGwSWNtcpCP0eLsk=; b=wXJ5b9F31S9QtdMALk/QTCdVdBAjbzsz9zva7pduuDrW6XXZnK8DvEE9/gwNpWIFZ4 0VDPmQuPAkkmeTDgzx4x0i07YRsT+tlSsoh629+aR/FryJHui78PbgJuruZjwFV+8HnN 9Xi5VK9zkE1yS++SoNH4+KZUp/yY9oi6C0w6s= DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlemail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=vAwVoH05JeDZmnnJXKE5mlbV85PRyuqjJ3s30HCV2E0Fo7WavXkMWEG6Ekhz0wT+Fe WzZCpoqidTKfn6HyuxlJ0vbl0oULmxnDpxVDJGcopzBkwIvj7gmesVe5Au1ibD0FK9Cy Mw0yL40qZUaL8F1NJKaRQmc0wQ53lm62Qx8FI= MIME-Version: 1.0 Received: by 10.42.221.137 with SMTP id ic9mr2610420icb.151.1289124191179; Sun, 07 Nov 2010 02:03:11 -0800 (PST) Received: by 10.231.79.69 with HTTP; Sun, 7 Nov 2010 02:03:11 -0800 (PST) In-Reply-To: <000d01cb7e30$2f5041f0$8d01a8c0@JAYDELL> References: <000c01cb7da9$23b1a1e0$8d01a8c0@JAYDELL> <000d01cb7e30$2f5041f0$8d01a8c0@JAYDELL> Date: Sun, 7 Nov 2010 10:03:11 +0000 Message-ID: From: Andy Talbot To: rsgb_lf_group@blacksheep.org DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: LF: exciter for 137 and 500 kHz Content-Type: multipart/alternative; boundary=20cf304347527c93890494739dec 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_40_50,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 x-aol-global-disposition: G X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-d285.1 ; domain : googlemail.com DKIM : pass x-aol-sid: 3039ac1d60894cd679b77256 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --20cf304347527c93890494739dec Content-Type: text/plain; charset=ISO-8859-1 Nice little prog - I'd love to see the source code :-) Taken from that reference :- "*The calculations to derive the time constants and therefore the 90 degree frequencies, and the component values, were based on equations in the article by Dr. (Eng) Ralph Oppelt, DB2NP, published in VHF Communications Volume No. 18, Summer, 2/1987.*" Does anyone have back copies of VHF Comms ??? Andy www.g4jnt.com On 7 November 2010 03:59, wrote: > Andy > > It's been a while ... but believe I used this online calculator. > > http://www.werewoolf.org.je/apf.htm > > Jay > > > > ----- Original Message ----- > *From:* Andy Talbot > *To:* rsgb_lf_group@blacksheep.org > *Sent:* Saturday, November 06, 2010 9:59 AM > *Subject:* Re: LF: exciter for 137 and 500 kHz > > Very Interesting. > Where did you find the design data for the allpass network? I've only > been able to find the values for up to 3+3 allpass stages. > > Mind you, at that number of chips a DSPic begins to look attractive. > > > Andy > www.g4jnt.com > > > On 6 November 2010 11:52, wrote: > >> Nothing earth shattering ... another way to skin the cat. The 137 and 500 >> kHz units have been in use for a few years ... just now getting around to >> the write up. >> >> http://www.w1vd.com/137-500Phasingexciter.html >> >> Jay W1VD WD2XNS WE2XGR/2 >> >> > --20cf304347527c93890494739dec Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Nice little prog - I'd love to see the source code :-)
=A0
Taken from that reference :-
"The calculations to derive the time constants and therefore= the 90 degree frequencies, and the component values, were based on equati= ons in the article by Dr. (Eng) Ralph Oppelt, DB2NP, published in VHF Comm= unications Volume No. 18, Summer, 2/1987."

Does anyone have back copies of VHF Comms ???

Andy
www.g4jnt.com


<= /p>

On 7 November 2010 03:59, <= ;jrusgrove@comcast.net> wrote:
Andy
=A0
It's been a while ...=A0but=A0bel= ieve I used this online calculator.
=A0
=A0
Jay
=A0
=A0
----- Original Message -----
Sent: Saturday, November 06, 2010= 9:59 AM
Subject: Re: LF: exciter for 137 an= d 500 kHz

Very Interesting.=A0=A0
Where did you find the design data for=A0the allpass network?=A0=A0= I've only been able to find the values for up to 3+3 allpass stages.<= /div>
=A0
Mind you,=A0at that number of=A0chips a DSPic begins to look attracti= ve.
=A0
On 6 November 2010 11:52, <= ;jrusgrove@comc= ast.net> wrote:
Nothing earth shattering ...= another way to skin the cat. The 137 and 500 kHz units have been in use= for a few years ... just now getting around to the write up.

http://www.w1vd.com/137-500Phasingexciter.html

Jay W1VD= =A0WD2XNS =A0WE2XGR/2


<= /div>

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