Return-Path: X-Spam-DCC: paranoid 1169; 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 t0UHrKpW001513 for ; Fri, 30 Jan 2015 18:53:20 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1YHFdq-0003Go-FX for rs_out_1@blacksheep.org; Fri, 30 Jan 2015 17:46:02 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1YHFdq-0003Gf-1z for rsgb_lf_group@blacksheep.org; Fri, 30 Jan 2015 17:46:02 +0000 Received: from mail-wi0-f172.google.com ([209.85.212.172]) by relay1.thorcom.net with esmtps (TLSv1.2:AES128-GCM-SHA256:128) (Exim 4.85) (envelope-from <73dk7fc@googlemail.com>) id 1YHFdo-0006j7-C0 for rsgb_lf_group@blacksheep.org; Fri, 30 Jan 2015 17:46:00 +0000 Received: by mail-wi0-f172.google.com with SMTP id h11so4729650wiw.5 for ; Fri, 30 Jan 2015 09:45:59 -0800 (PST) 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=O7wd1ll8UG19AFl5VGQa4Xp79NDkZyxgGcjejsj2zbk=; b=SXRve7ojN9GaWiA6CExC7ESiazn1apFStuWZLySYg7rjfrtXp8M2iVojIjJ2s7VB9O nQHHrs7qaWoPlz/VqEgmkFNekBaQt0en0vo48I8oGCODQP+6iInz+/MlsiL6n9ygZwU/ VkjFS4FwJKBcdKZD3VmCEDa78l/3rBnNrHYoQEXSJujWWFD2gDDcDn7k9vw5vmpygPRh NksLc4QMKlvVvFFotQ9JgppL20wS2cauve7FzxI7V9HA0hWLIkqgvsndymU+2qEwPL4W YHorZJ5QJwmwCw619hwOnksvuvsJahZByE5KlqKcJaQ5igq5J44VyFePd1kEVsKxGkvU yHYg== X-Received: by 10.181.29.201 with SMTP id jy9mr6960915wid.17.1422639959456; Fri, 30 Jan 2015 09:45:59 -0800 (PST) Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de. [129.206.22.206]) by mx.google.com with ESMTPSA id f7sm15866319wjq.28.2015.01.30.09.45.57 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 30 Jan 2015 09:45:58 -0800 (PST) From: DK7FC <73dk7fc@googlemail.com> X-Google-Original-From: DK7FC <73dk7fc@gmail.com> Message-ID: <54CBC354.9010604@gmail.com> Date: Fri, 30 Jan 2015 18:45:56 +0100 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: <5E5CE58E519E4555A1A38CCC37F8AA17@malHP> In-Reply-To: <5E5CE58E519E4555A1A38CCC37F8AA17@malHP> X-Scan-Signature: 7001055fa59a9c23b9831ea6d317a074 Subject: LF: MF WSPR remote RX experiments Content-Type: text/plain; charset=ISO-8859-1; 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: 2193 Hello MF, I've continued with tests for my remote RX station. Right now i am running a Raspberry pi on a 7 Ah battery. It drives a WLAN stick and a simple USB sound card, feeding audio via a vorbis steam through the web. A MF receiver (LO = 461 kHz) is running on the same battery. The RX is connected to the same antenna where my MF/LF grabber is connected to. Ah and the Raspberry pi is powered by an external switch mode regulator, 12V=>5V! All in all this consumes about 250 mA @ 12V. I am playing the vorbis audio stream (about 220 kbps) directly in SpecLab where i can see the full MF spectrum. SpecLab is running a 2.5 kHz wide band filter and frequency converter feeding a virtual audio cable. Finally this is connected to WSPR-X... Now i can compare the SNR difference on both, the grabber RX and the remote-RX plus web data stream. The receivers are technically nearly identical as well as the filter settings. There is some time delay but it is not problematic, no correction needed for WSPR. I'm getting quite good results from the first attempt, a SNR difference less than +- 1 dB. The remote system is not running in the garden now, just a local test. WSPR reports on MF via web streaming are coming in at DK7FC/RPI. The test is running for a few hours now :-) 73, Stefan/DK7FC