Return-Path: Received: (qmail 62521 invoked from network); 3 Dec 2003 08:37:42 -0000 Received: from unknown (HELO netmail00.services.quay.plus.net) (212.159.14.218) by ptb-mailstore with SMTP; 3 Dec 2003 08:37:42 -0000 Received: (qmail 24183 invoked from network); 3 Dec 2003 08:37:42 -0000 Content-Transfer-Encoding: 8bit X-Filtered-by: Plusnet (hmail v1.01) X-Priority: 3 X-MSMail-Priority: Normal X-Spam-detection-level: 11 Received: from post.thorcom.com (193.82.116.20) by netmail00.services.quay.plus.net with SMTP; 3 Dec 2003 08:37:37 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Fake-Domain: majordom Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ARSVP-0002l3-To for rsgb_lf_group-outgoing@blacksheep.org; Wed, 03 Dec 2003 08:37:07 +0000 Received: from [134.58.240.46] (helo=spoetnik.kulnet.kuleuven.ac.be) by post.thorcom.com with esmtp (Exim 4.14) id 1ARSVP-0002ku-Fd for rsgb_lf_group@blacksheep.org; Wed, 03 Dec 2003 08:37:07 +0000 Received: from localhost (localhost [127.0.0.1]) by spoetnik.kulnet.kuleuven.ac.be (Postfix) with ESMTP id 4AED53420D for ; Wed, 3 Dec 2003 09:36:37 +0100 (CET) Received: from antonius.kulnet.kuleuven.ac.be (antonius.kulnet.kuleuven.ac.be [134.58.240.73]) by spoetnik.kulnet.kuleuven.ac.be (Postfix) with ESMTP id D6C6034207 for ; Wed, 3 Dec 2003 09:36:36 +0100 (CET) X-Fake-Domain: dell-rik.fys.kuleuven.ac.be Received: from dell-rik.fys.kuleuven.ac.be (pc-10-33-165-177.fys.kuleuven.ac.be [10.33.165.177]) by antonius.kulnet.kuleuven.ac.be (Postfix) with ESMTP id 9A72F4C0D1 for ; Wed, 3 Dec 2003 09:36:36 +0100 (CET) Message-ID: <5.1.0.14.0.20031203090315.034672d0@u0019445.kuleuven.be> X-Sender: u0019445@u0019445.kuleuven.be X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Wed, 03 Dec 2003 09:38:25 +0100 To: rsgb_lf_group@blacksheep.org From: "Rik Strobbe" In-reply-to: <003b01c3b902$f0523b60$e5e9fc3e@l8p8y6> References: <3FCB07EA.8688D77D@fh-amberg-weiden.de> <5.1.0.14.0.20031202141618.0220b138@u0019445.kuleuven.be> MIME-Version: 1.0 X-Virus-Scanned: by KULeuven Antivirus Cluster Subject: Re: LF: Re: Beacon List Content-Type: text/plain; charset=us-ascii; format=flowed X-Spam-Checker-Version: SpamAssassin 2.60 (1.212-2003-09-23-exp) on post.thorcom.com X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.60 X-SA-Exim-Scanned: Yes Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rsgb_lf_group-outgoing@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Spam-Rating: 1 At 18:26 2/12/2003 +0000, G3KEV wrote : >Hi Rick >If not too difficult maybe 20 khz top freq would be useful for a bit of >tolerance for some IF outputs. >73 de Mal/G3KEV Hi Mal, Using the soundcard the theoretical limit is 22kHz (22.05kHz to be exact) assuming as 44.1kHz sample rate. Using the PC speaker one can go much higher, but at higher frequencies the steps become rather large as the PC speaker tone is derived from a 1.193182MHz xtal source, divided by 2 - 65536. So the theoretical limits are 18.2Hz to almost 600kHz. 20kHz would be derived as 1193.182kHz / 60 = 19.886Hz (so a 114Hz error). The next lower frequency would be 19.560kHz, the next higher 20.223kHz. 73, Rik PS : Although the upper limit is almost 600kHz forget about using the PC speaker as a 137kHz signal source : 1193.182 / 9 = 132.576kHz and 1193.182 / 8 = 149.148kHz.