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=-0.7 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, RATWARE_GECKO_BUILD 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 tB6C2MtH026962 for ; Sun, 6 Dec 2015 13:02:22 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1a5Xy9-0003qX-HG for rs_out_1@blacksheep.org; Sun, 06 Dec 2015 11:59:09 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1a5Xy9-0003qO-7d for rsgb_lf_group@blacksheep.org; Sun, 06 Dec 2015 11:59:09 +0000 Received: from mout3.freenet.de ([195.4.92.93]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.86) (envelope-from ) id 1a5Xx5-0000Os-7E for rsgb_lf_group@blacksheep.org; Sun, 06 Dec 2015 11:59:08 +0000 Received: from [195.4.92.142] (helo=mjail2.freenet.de) by mout3.freenet.de with esmtpa (ID dl4yhf@freenet.de) (port 25) (Exim 4.85 #1) id 1a5Xwo-0006Cv-N7 for rsgb_lf_group@blacksheep.org; Sun, 06 Dec 2015 12:57:46 +0100 Received: from localhost ([::1]:36443 helo=mjail2.freenet.de) by mjail2.freenet.de with esmtpa (ID dl4yhf@freenet.de) (Exim 4.85 #1) id 1a5Xwo-00085p-J3 for rsgb_lf_group@blacksheep.org; Sun, 06 Dec 2015 12:57:46 +0100 Received: from mx14.freenet.de ([195.4.92.24]:35235) by mjail2.freenet.de with esmtpa (ID dl4yhf@freenet.de) (Exim 4.85 #1) id 1a5Xuc-00081a-Fi for rsgb_lf_group@blacksheep.org; Sun, 06 Dec 2015 12:55:30 +0100 Received: from x4d025fa9.dyn.telefonica.de ([77.2.95.169]:56329 helo=[192.168.178.27]) by mx14.freenet.de with esmtpsa (ID dl4yhf@freenet.de) (TLSv1.2:DHE-RSA-AES128-SHA:128) (port 587) (Exim 4.85 #1) id 1a5Xub-0002VW-W5 for rsgb_lf_group@blacksheep.org; Sun, 06 Dec 2015 12:55:30 +0100 To: rsgb_lf_group@blacksheep.org References: <56640EE5.7040803@freenet.de> From: =?UTF-8?Q?Wolfgang_B=c3=bcscher?= Message-ID: <56642230.8040907@freenet.de> Date: Sun, 6 Dec 2015 12:55:28 +0100 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0 MIME-Version: 1.0 In-Reply-To: X-Originated-At: 77.2.95.169!56329 X-Scan-Signature: 4b5b5ebe37a4c4f430f59bc35c1947b0 Subject: Re: LF: EbNaut / Coherent PSK reception with SDR (-IQ) or similar radios Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit 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: 5605 Thanks Andy. These MC155170 are hard to find these days, but I have a couple of PMB2306 chips from scrapped wireless phones waiting for a new life. One of them has already made it into a 70 MHz synthesizer... and on a 'nice' combination of the divider and multiplier value, as you mentioned, the phase noise may be low enough to clock an SDR with it (even though exactly that's what G4HUP does *not* recommend in his article). Or maybe a 66.6666 MHz stock oscillator can be turned into a VCXO simply by varying its supply voltage (a tiny bit).. may be worth trying. Cheers, Wolf . Am 06.12.2015 um 11:46 schrieb Andy Talbot: > 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 . >> >>