Return-Path: X-Spam-DCC: paranoid 1170; 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,SPF_PASS 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 u65EpxFS006400 for ; Tue, 5 Jul 2016 16:52:00 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1bKRbr-0000D1-6a for rs_out_1@blacksheep.org; Tue, 05 Jul 2016 15:45:59 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1bKRbq-0000Cs-M8 for rsgb_lf_group@blacksheep.org; Tue, 05 Jul 2016 15:45:58 +0100 Received: from mout02.posteo.de ([185.67.36.66]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1bKRbo-0008V2-RW for rsgb_lf_group@blacksheep.org; Tue, 05 Jul 2016 15:45:57 +0100 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id 9EFFF20AF8 for ; Tue, 5 Jul 2016 16:45:53 +0200 (CEST) Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 3rkRX05dwWzyfL; Tue, 5 Jul 2016 16:45:52 +0200 (CEST) Message-ID: <577BC820.9090809@posteo.de> Date: Tue, 05 Jul 2016 16:45:52 +0200 From: DK7FC User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org CC: Renato Romero References: <5772DAC0.7080001@df3lp.de> <5773CA12.50009@posteo.de> <5773D53A.5070900@abelian.org> <577B9E96.8070807@posteo.de> In-Reply-To: <577B9E96.8070807@posteo.de> X-Scan-Signature: c1f72e5acb1277e013f90c915ad7ad68 Subject: LF: Portable VLF/ULF recording system with PPS+NMEA Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit 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 10.1.3.11 Status: O X-Status: X-Keywords: X-UID: 8346 Hi all, I've completed my portable VLF/ULF(audio) recording system. See: https://dl.dropboxusercontent.com/u/19882028/ULF/VLFesULF%20portable%20recording.jpg The system consists out of a: - Raspberry Pi 2B - DC/DC converter with a 5.0V output (80% efficiency) - 7 Ah lead acid battery - Stereo input soundcard - 32 GB USB stick - NEO-6M GPS module (including antenna) - (shut down button) - (switch for starting/stopping a recording) The latest add-on, the GPS module now allows to record 1PPS impulses and NMEA data for most accurate and glitch-free(corrected) recordings, absolute timestamps as well as location data. The recording is stred as a wav file to the USB stick directly. It consumes 160 mA at 12V during a record. With the battery it should be no problem to record for nearly 2 days. Future ULF reception tests can now be done with this improved technique... 73, Stefan