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[129.206.22.206]) by mx.google.com with ESMTPSA id dy10sm37457035wib.3.2014.06.23.15.46.44 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 23 Jun 2014 15:46:44 -0700 (PDT) From: DK7FC <73dk7fc@googlemail.com> X-Google-Original-From: DK7FC <73dk7fc@gmail.com> Message-ID: <53A8AE53.3060504@gmail.com> Date: Tue, 24 Jun 2014 00:46:43 +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: <1403433467.29408.YahooMailBasic@web173001.mail.ir2.yahoo.com> <1WyhZD-2GWXa40@fwd29.t-online.de> In-Reply-To: X-Spam-Score: -0.7 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hi Joe, Fine to hear that you're give it a try. Please, don't ask Industry Canada if the 10mW is RF power of ERP! To get out a real signal on VLF, there is no alternative to a real large coil without ferrites! Think about the high voltages... But 100m of antenna wire is a good start. I remember 550 mH for my 100m kite antenna. For me it was 2000m of 0.4mm diameter wire :-) Nice work is that. Takes long but is a funny game :-) [...] Content analysis details: (-0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [74.125.82.52 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (73dk7fc[at]googlemail.com) -0.0 SPF_PASS SPF: sender matches SPF record 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: b77892ad90d0261eaf071f4f6cf31464 Subject: Re: LF: VLF in Canada 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=0.3 required=5.0 tests=FROM_HAS_MIXED_NUMS 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 Hi Joe, Fine to hear that you're give it a try. Please, don't ask Industry Canada if the 10mW is RF power of ERP! To get out a real signal on VLF, there is no alternative to a real large coil without ferrites! Think about the high voltages... But 100m of antenna wire is a good start. I remember 550 mH for my 100m kite antenna. For me it was 2000m of 0.4mm diameter wire :-) Nice work is that. Takes long but is a funny game :-) 73, GL, Stefan Am 23.06.2014 21:33, schrieb jcraig@mun.ca: > Dear Group, > > I tried again to get an LOA for VLF. This time, the response from > Industry Canada was favourable: 10 mW 8.0-8.3 kHz. Yesterday, after a > few slight rf burns, and thanks to PA0RDT's miniwhip design and > DL4YHF's Spectrum Lab and advice, VLF sigs on 8.277 kHz were heard at > 200m from the 100m wire aerial. This was a reception outside my back > yard! 10 watts from an 1970's keyboard amp (volume control set on 3) > were stepped up with an xfmr to a lossy 500 ohm tuning coil peaked > with a ferrite rod for maximum squeal at L=0.35 H. > > Is it possible for someone who is not especially enthralled by winding > a mile of 0.7mm wire to use an iron core to make a VLF tuning coil? > > 73 > Joe VO1NA >