Return-Path: Received: from mtain-dh04.r1000.mx.aol.com (mtain-dh04.r1000.mx.aol.com [172.29.65.24]) by air-de05.mail.aol.com (v129.10) with ESMTP id MAILINDE051-5eb24df2784b2c3; Fri, 10 Jun 2011 16:02:19 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dh04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 7D12238000090; Fri, 10 Jun 2011 16:02:17 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QV7t7-0008It-C9 for rs_out_1@blacksheep.org; Fri, 10 Jun 2011 21:01:01 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QV7t6-0008Ik-RT for rsgb_lf_group@blacksheep.org; Fri, 10 Jun 2011 21:01:00 +0100 Received: from smtp6.freeserve.com ([193.252.22.192]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1QV7t4-0002n9-I5 for rsgb_lf_group@blacksheep.org; Fri, 10 Jun 2011 21:01:00 +0100 Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf3621.me.freeserve.com (SMTP Server) with ESMTP id D440570000A3 for ; Fri, 10 Jun 2011 22:00:52 +0200 (CEST) Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf3621.me.freeserve.com (SMTP Server) with ESMTP id C4FDD70000B1 for ; Fri, 10 Jun 2011 22:00:52 +0200 (CEST) Received: from AGB (unknown [2.26.46.82]) by mwinf3621.me.freeserve.com (SMTP Server) with SMTP id 5E7E970000A3 for ; Fri, 10 Jun 2011 22:00:50 +0200 (CEST) X-ME-UUID: 20110610200050387.5E7E970000A3@mwinf3621.me.freeserve.com Message-ID: <23406FC955824BC0B78E96AEE22D0EA1@AGB> From: "Graham" To: References: <4DF11A78.4020401@iup.uni-heidelberg.de> <001901cc2743$81695dc0$0401a8c0@xphd97xgq27nyf> <4DF207EF.5060700@iup.uni-heidelberg.de> <003801cc276e$63c6f1d0$0401a8c0@xphd97xgq27nyf> <4DF24806.7030508@iup.uni-heidelberg.de> <004601cc2791$72c3d680$0401a8c0@xphd97xgq27nyf> In-Reply-To: Date: Fri, 10 Jun 2011 21:00:49 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 X-Antivirus: avast! (VPS 110610-0, 10/06/2011), Outbound message X-Antivirus-Status: Clean X-Spam-Score: 0.2 (/) X-Spam-Report: autolearn=disabled,RCVD_ILLEGAL_IP=0.234 Subject: Re: LF: Re: First tests on VLF at DK7FC in Heidelberg Content-Type: text/plain; format=flowed; charset="ISO-8859-15"; reply-type=response Content-Transfer-Encoding: quoted-printable X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.1 required=5.0 tests=MISSING_OUTLOOK_NAME 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: 3039ac1d41184df278484d03 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Just as the advert says 'things go better with Coca-Cola' 35 feet of wire with a coke bottle on the end crossed the pond quit= e=20 nicely http://rosmodem.wordpress.com/2011/02/14/the-blue-ribbon-fastest-live-data-= to-cross-the-atlantic/ G.. until the signal fizzled out :) -------------------------------------------------- From: "Hugh M0WYE" Sent: Friday, June 10, 2011 7:58 PM To: Subject: Re: LF: Re: First tests on VLF at DK7FC in Heidelberg > > PET - Polyester - is a recognised capacitor dielectric, and not=20 > particularly lossy. > I don't see why it shouldn't work - as long as you drink the cola first. > 73 > Hugh M0WYE > > > ----- Original Message -----=20 > From: "mal hamilton" > To: > Sent: Friday, June 10, 2011 6:11 PM > Subject: Re: LF: Re: First tests on VLF at DK7FC in Heidelberg > > >> Stefan >> Using LOSSY coca cola bottles as a dielectric is not recommended and poo= r >> stability makes things worse!!!!!!!!! >> With this information I do not think a QSO is possible >> de mal/g3kev >> >> ----- Original Message ----- >> From: "Stefan Sch=E4fer" >> To: >> Cc: "Paul" ; "Bernd Grupe" >> >> Sent: Friday, June 10, 2011 5:36 PM >> Subject: Re: LF: Re: First tests on VLF at DK7FC in Heidelberg >> >> >> After a break i am back on air in this moment transmitting a long >> carrier. The signal generator is the DDS VFO, so stability is not >> perfect but should be suitable for 424 uHz i hope. It is a very first=20 >> test. >> >> When using the antenna wire with maximum L i currently have available, >> the resonance is at 9.64 kHz, not to far away. I built a capacitor out >> of 2 aluminium plates and 2 coca cola bottles and come to resonance now >> on 8970 Hz. Before is used the bottles, i used stones. But they became >> HOT and later there was a black hole into them sparking around! These >> losses reduced the antenna power to less than 200 mA. Now i have about >> 500 mA antenna current and will transmit a longer dash until i see some >> traces on the grabbers, hopefully. >> >> When running the system without external addional C, so on 9.64 kHz, i >> am getting 360 mA antenna current at 80 W PA input power. The coil >> losses are 320 Ohm so the sourrounding losses seem to be about 300 Ohm >> which is not to much, thinking about trees and buildings... >> >> Now, i'll TX for some time, maybe 2 hours ort so. >> >> Any reports so far? >> >> 73, Stefan/DK7FC >> >> >> Am 10.06.2011 15:00, schrieb mal hamilton: >>> Stefan >>> My monitor is running/Speclab dfcw600 es Antenna 150 metre inv L up ove= r >> 33 >>> metres vertical. Condx all bands Good at present >>> >>> de mal/g3kev >>> >>> ----- Original Message ----- >>> From: "Stefan Sch=E4fer" >>> To: >>> Cc: "Paul"; "Bernd Grupe" >>> >>> Sent: Friday, June 10, 2011 1:02 PM >>> Subject: Re: LF: Re: First tests on VLF at DK7FC in Heidelberg >>> >>> >>> Hello Mal, VLF, >>> >>> OK, i am actually RX QRV on LF all the time here. And i have internet >>> during the test! :-) >>> >>> Now, the coil is on the roof and it's dry. I will prepare now... Maybe >>> the first VLF antenna current in a 20 minutes... >>> >>> 73, Stefan/DK7FC >>> >>> >>> Am 10.06.2011 09:53, schrieb mal hamilton: >>> >>>> Stefan >>>> I will leave my monitor on 8970 DFCW 600 mode. If I detect your signal=20 >>>> I >>>> will reply on 137.7 CW or QRS3. >>>> 73 De Mal/G3KEV >>>> >>>> ----- Original Message ----- >>>> From: "Stefan Sch=E4fer" >>>> To: >>>> Cc: "Paul"; "Bernd Grupe" >>>> >>>> Sent: Thursday, June 09, 2011 8:09 PM >>>> Subject: VLF: First tests on VLF at DK7FC in Heidelberg >>>> >>>> >>>> >>>> >>>>> VLF, >>>>> >>>>> Tomorrow i plan to do first tests on 8970 Hz on my fixed antenna in >>>>> Heidelberg, >>>>> http://no.nonsense.ee/qthmap/?qth=3DJN49IK00WG&from=3Djn49ik00WD It i= s=20 >>>>> about >>>>> 30m up. >>>>> >>>>> I'll start doing some resonating tests and may come on air in the >>>>> afternoon. The small PA (max. 300W) will be used in this first test >>>>> since it is easier to manage. Maybe the resonance will be some kHz >>>>> higher but i hope to come down into the Dreamers Band (TM). >>>>> >>>>> I expect to be visible on "local" grabbers like DF6NM, OE3GHB and >>>>> OK2BVG. If all works well i plan to transmit a longer dash, maybe 600= 0 >>>>> seconds and later a short message in DFCW-600, like "K" or so, just=20 >>>>> for >>>>> the proof and to get a first impression about the efficiency of this >>>>> antenna. >>>>> >>>>> I had the idea to buy some flexible aluminium tube to form a toroid=20 >>>>> that >>>>> will be placed on the top of the coil. Tis reduces the maximum E fiel= d >>>>> and adds some C, that might be needed to come down to 8970 Hz... >>>>> >>>>> Of course all this depends on the absence of rain but now i don't nee= d >>>>> wind! Therefore, the signals will be about 20 dB lower, probably. >>>>> >>>>> The signal will be overload my grabber >>>>> http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.html >>>>> that is in about 20 m (!) distance. Hopefully it gets not damaged due=20 >>>>> to >>>>> several 10 kV on the wire. >>>>> >>>>> Is there someone who will watch for that signal? >>>>> >>>>> Reports would be very apprechiated! >>>>> >>>>> 73, CU, Stefan/DK7FC >>>>> >>>>> >>>>> >>>> >>> >>> >> >> >> > > >=20