Return-Path: Received: from mtain-dk03.r1000.mx.aol.com (mtain-dk03.r1000.mx.aol.com [172.29.180.7]) by air-mc04.mail.aol.com (v129.4) with ESMTP id MAILINMC043-a9314d7a1e0c124; Fri, 11 Mar 2011 08:05:16 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dk03.r1000.mx.aol.com (Internet Inbound) with ESMTP id E5C77380000B8; Fri, 11 Mar 2011 08:05:14 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Py21A-0002jT-HP for rs_out_1@blacksheep.org; Fri, 11 Mar 2011 13:04:32 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Py21A-0002jK-4Y for rsgb_lf_group@blacksheep.org; Fri, 11 Mar 2011 13:04:32 +0000 Received: from mout0.freenet.de ([195.4.92.90]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Py219-0007wg-6z for rsgb_lf_group@blacksheep.org; Fri, 11 Mar 2011 13:04:32 +0000 Received: from [195.4.92.27] (helo=17.mx.freenet.de) by mout0.freenet.de with esmtpa (ID dl4yhf@freenet.de) (port 25) (Exim 4.72 #3) id 1Py217-00083p-KR for rsgb_lf_group@blacksheep.org; Fri, 11 Mar 2011 14:04:29 +0100 Received: from blfd-5d823735.pool.mediaways.net ([93.130.55.53]:4688 helo=[192.168.0.101]) by 17.mx.freenet.de with esmtpsa (ID dl4yhf@freenet.de) (TLSv1:CAMELLIA256-SHA:256) (port 465) (Exim 4.72 #3) id 1Py215-0001Ai-QM for rsgb_lf_group@blacksheep.org; Fri, 11 Mar 2011 14:04:28 +0100 Message-ID: <4D7A1DD9.3060606@freenet.de> Date: Fri, 11 Mar 2011 14:04:25 +0100 From: wolf_dl4yhf User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.2.15) Gecko/20110303 Thunderbird/3.1.9 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <4D793C04.3020600@freenet.de> <4D78FF0B.8A4E.00FD.0@globalstar.com>,<4D79473B.3020004@freenet.de> In-Reply-To: X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: VLF Whistler activity Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.63 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-aol-global-disposition: G x-aol-sid: 3039ac1db4074d7a1e0a3e58 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) Hello Rik, you wrote: > Hello Wolf, > > a very nice setup. > One question about the FM-link: is the dynamic range sufficient ? > To take full advantage of a 16 bit ADC (soundcard) the dynamic rang of the FM linl should exceed 96dB. > The receiver's dynamic range certainly isn't adequate for a 16-bit ADC. At the moment (with a kenwood TH-F7, certainly not "HiFi") it seems to be somewhere between 60 and 70 dB. Difficult to measure because it's frequency dependent (FM pre/de-emphasis). The gain (at the FM tx) was adjusted until the sferics only caused occasional clipping, and the background hiss from the UHF-RX just becomes audible. Unfortunately the wireless lan doesn't work reliably enough at the remote site; if it did, the 'streaming PC' would be at the RX site. Cheers, Wolf . P.S: As expected, there was auroral chorus on VLF this morning. Sounds like frogs, toads, and birds. Paul Nicholson's automatic detector caught some of them, and saved a few seconds per event in a wave file. The spectrograms can be seen as thumbnails, and wavefiles can be downloaded from here (you may have to select 'earlier events', since most of the events are normal whistlers ): http://abelian.org/vlf/events.php?stream=vlf6 or, for comparison, Paul's own stream in Todmorden, UK: http://abelian.org/vlf/events.php?stream=vlf1