Return-Path: X-Spam-DCC: paranoid 1290; 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 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 tB6Ap1Y0026873 for ; Sun, 6 Dec 2015 11:51:01 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1a5WrN-0003P3-KY for rs_out_1@blacksheep.org; Sun, 06 Dec 2015 10:48:05 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1a5WrN-0003Ou-Bj for rsgb_lf_group@blacksheep.org; Sun, 06 Dec 2015 10:48:05 +0000 Received: from mail-wm0-f45.google.com ([74.125.82.45]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.86) (envelope-from ) id 1a5WqT-00007K-25 for rsgb_lf_group@blacksheep.org; Sun, 06 Dec 2015 10:48:04 +0000 Received: by wmuu63 with SMTP id u63so108960399wmu.0 for ; Sun, 06 Dec 2015 02:46:54 -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:content-transfer-encoding; bh=SYy58slqH3HCYjPrLHQuXappsYhSQiXrdf7lPrnEdoo=; b=oRDhwfrFf4wj8yzaiBElbUTEXFPFOH/m5aPEHpWk8ka9HUsbPNYxh4lbK7qzWWIwP1 O+5u9MHv/eMwKKeSuHf3gUXUmKyaMlBzw7yyDCYlKK8Pqlo0zsE/jvkvBxGqJk2xxjQy ty3hyT9FiXH7qmZkX+d0G4jJJw8oulTl6ioJmIoIWl3jpIza1s/C9V0JBFPW2QQ5SH9S wwFTmqi28+3v5tb5twDB4h2HeMD9K7G4HLlQVmY+p7ba73p8JNwk91aEA9so9yDR2rkq bsBuSXdq4jEZOpLJoL8RldVJL0QwwRpbUg/lgUg2lXmCcpcQhEODLYW9CYvxx81ilFyz VTXQ== MIME-Version: 1.0 X-Received: by 10.28.9.138 with SMTP id 132mr14902926wmj.19.1449398814036; Sun, 06 Dec 2015 02:46:54 -0800 (PST) Received: by 10.28.130.139 with HTTP; Sun, 6 Dec 2015 02:46:53 -0800 (PST) In-Reply-To: <56640EE5.7040803@freenet.de> References: <56640EE5.7040803@freenet.de> Date: Sun, 6 Dec 2015 10:46:53 +0000 Message-ID: From: Andy Talbot To: rsgb_lf_group@blacksheep.org X-Scan-Signature: 64437c466041e93ffedda7fb96b22b71 Subject: Re: LF: EbNaut / Coherent PSK reception with SDR (-IQ) or similar radios Content-Type: text/plain; charset=UTF-8 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 Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by paranoid.lipkowski.org id tB6Ap1Y0026873 Status: O X-Status: X-Keywords: X-UID: 5602 I did it with a simple PLL VCO running at 66.6...MHz divided by 30. 10MHz reference input divided by 3, Phase comparator running at 333.333...kHz I used a superannuated obsolete MC145170 chip, but there are a plethora of modern PLL chips out now that will do it for you. Several types even have internal VCOs so you can have a one chip solution (plus the programmer, of course) Andy G4JNT On 6 December 2015 at 10:33, Wolfgang Büscher wrote: > Greetings all, > > After trying a couple of modifications to my SDR-IQ, I found the following > site .. > > http://g4hup.com/SDRlock.html > > .. which describes how to lock the 66.6667 MHz 'ADC clock' in the SDR-IQ to > an external 10 MHz reference. > > Does anyone here have own experiences with this, or a similar circuit ? > Dividing the 10 MHz reference by three, and subtracting that from 10 MHz > multiplied by 7 sounds intriguing, but a multi-pole crystal ladder filter to > 'clean up' the resulting 66.6666666 MHz signal is easier said than done > (..lacking such crystals in the junk box). > > 73, > Wolf DL4YHF . > >