Return-Path: X-Spam-DCC: paranoid 1233; 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=-0.9 required=5.0 tests=BAYES_00,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 s7CHcUaf016941 for ; Tue, 12 Aug 2014 19:38:30 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1XHFuM-0000Ns-S3 for rs_out_1@blacksheep.org; Tue, 12 Aug 2014 18:30:50 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1XHFuM-0000Nj-Ic for rsgb_lf_group@blacksheep.org; Tue, 12 Aug 2014 18:30:50 +0100 Received: from mail-lb0-f173.google.com ([209.85.217.173]) by relay1.thorcom.net with esmtps (TLSv1:RC4-SHA:128) (Exim 4.82) (envelope-from <73dk7fc@googlemail.com>) id 1XHFuK-0003wA-P4 for rsgb_lf_group@blacksheep.org; Tue, 12 Aug 2014 18:30:49 +0100 Received: by mail-lb0-f173.google.com with SMTP id u10so5387776lbd.4 for ; Tue, 12 Aug 2014 10:30:47 -0700 (PDT) X-DKIM-Result: Domain=googlemail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=20120113; h=from:message-id:date:user-agent:mime-version:to:subject:references :in-reply-to:content-type:content-transfer-encoding; bh=UH6d8pNBYtJZDhXXEKJXnNGuhlKpj5o6u5U2t2Wi4OA=; b=UedVKElC54Ytv3wXFzqq9xl1DiIaO/89yJEwrX4TprpkwoSO5a/FDhnd6rbiSa4NR1 4GPdQanR0ISmFlSvZJZ0T65qN5VwOib3ymFbnMwSbuze6kqBuH4baGQPvOZCr8c7aODj 9/s/1wxYTOlkixfToQBrFK0lUC7AUozZTb6HqB597ipoaQflvWx80ZdPQIxTWWeUSH56 6YVl+7DvxOORpP7DL2GqZcdSdilyeLTHfKyeGu/mEiXYWl50PpGISuzyUcjSrzCoe54T iKevY+DWazmpKQgP0RwnRhDPwQwbZQq+6tK1e6fCndllEL9/p6FG5eIWbjxWEUe5z0nK X5Vw== X-Received: by 10.112.62.132 with SMTP id y4mr3434867lbr.105.1407864646881; Tue, 12 Aug 2014 10:30:46 -0700 (PDT) Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de. [129.206.22.206]) by mx.google.com with ESMTPSA id rd5sm8184052lac.42.2014.08.12.10.30.45 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 12 Aug 2014 10:30:45 -0700 (PDT) From: DK7FC <73dk7fc@googlemail.com> X-Google-Original-From: DK7FC <73dk7fc@gmail.com> Message-ID: <53EA4F44.2080008@gmail.com> Date: Tue, 12 Aug 2014 19:30:44 +0200 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 References: <6sy16079bxn8868kayf6iipl.1407843322675@email.android.com> In-Reply-To: <6sy16079bxn8868kayf6iipl.1407843322675@email.android.com> X-Scan-Signature: 64a43ebf6189d3fbac7adf77f3718769 Subject: LF: VLF Icecast server, Raspberry PI and all that stuff 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 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 200 Hi all, Now since i have my new garden i'm spending a lot of time reading about possible ways to permanently transfer "audio" data from the garden to the institute. I have a direct view from a tree. This image was taken in the tree in about 15m AGL, https://dl.dropboxusercontent.com/u/19882028/20140809_211119_2.jpg I'm planning to install a 20W solar module there in the tree as well as a 7 Ah accu, it is already here on my table!! ...as well as a WLAN yagi and a high power WLAN USB stick. This may sound OT and it is, but recent emails about the topic has shown that there seem to be a few LF amateurs considering to use their garden as a clean remote RX location. So this may help to bring up some more intersting projects on VLF...MF. Experiments will go on in small steps. But very soon i would like to permanently stream data to the institute to feed it into Spaclab and generate images for the grabbers as well as WSPR decodes and so on. All the Speclab instances should run on the institute to reduce the power consumption. Now, at work i started to successfully establish a SPI link reading an ADC with an Arduino board but the Raspberry Pi seems to be the right choice here. I started to read about it and it sounds interesting. And its power consumption can be managed, it appears to be realistic. I read about WLAN links using normal cheap USB WLAN dongles in combination with the RasPI, as well as the use of cheap USB sound cards in combination with the RasPI. The most recent article i read was about running an Icecast server on the RasPI, feeding audio data (actually music but it could be VLF too! :-) ) via Ogg Vorbis format into the web. I remember VLF streams by DL4YHF and/or Paul Nicholson using similar formats. So my idea and plan is to: 1: Install the WLAN link over 2.4 km distance using 2 high gain yagis and 2 USB WLAN sticks with external antenna connectors 2: Check the data rate and availability under difficult conditions (rain, storm (moving tree)) 3: Do some portable tests with the netbook 4: Install the solar module and batteries and solar charger (later i can install a few more modules if necessary) 5: Replace the netbook by the RasPI 6: Do various tests on the RasPI using 24 bit ADC with a high samplerate (maybe 1 Msps). The first large goal should be to establish a permanent stream of data of a 192 kS/s 2 channel sound card over that distance and at lowest power consumption levels. Does someone have useful ideas or comments which may be helpful? 73, Stefan/DK7FC