Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mk06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 86B2D380000A5; Fri, 25 Nov 2011 15:41:37 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RU2Zq-0008KI-U0 for rs_out_1@blacksheep.org; Fri, 25 Nov 2011 20:40:54 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RU2Zq-0008K9-BA for rsgb_lf_group@blacksheep.org; Fri, 25 Nov 2011 20:40:54 +0000 Received: from outbound-jn.vgs.untd.com ([64.136.55.20] helo=smtpout01.dca.untd.com) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1RU2Zn-00026M-NI for rsgb_lf_group@blacksheep.org; Fri, 25 Nov 2011 20:40:54 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=juno.com; s=alpha; t=1322253643; bh=47DEQpj8HBSa+/TImW+5JCeuQeRkm5NMpJWZG3hSuFU=; l=0; h=To:Date:Subject:Message-ID:Content-Type:From; b=oZwXPYKbsdmXBcQJ2JpIX+lGYYarheifmTFU/RKY9b4BkcZmZMXisHPslQlhUD08B TRXEqjevo9Cg4RdSsR6t0cb/H3irAWQ0Y4Ck8F1Ew1oqVc26j6vCra/z6KQB3KfbLH kTK6TYV+Gb0uGhSmILOT/MY2mTAHWHVQW9m5m15U= X-UOL-TAGLINE: true Received: from outbound-jn.vgs.untd.com (localhost [127.0.0.1]) by m03.vgs.untd.com with SMTP id AABHN99LAAKA4CDA for (sender ); Fri, 25 Nov 2011 12:40:32 -0800 (PDT) X-UNTD-OriginStamp: yokUgcxCbtTP7XLrpefewJIIV2rRbAWwZT74Ju0YNxQ1w7shIBVlkw== Received: (from riese-k3djc@juno.com) by m03.vgs.untd.com (jqueuemail) id RSYWB256; Fri, 25 Nov 2011 12:39:31 PST To: rsgb_lf_group@blacksheep.org Date: Fri, 25 Nov 2011 15:33:21 -0500 Message-ID: <20111125.153848.3988.3.riese-k3djc@juno.com> X-Mailer: Juno 5.0.49 MIME-Version: 1.0 X-Juno-Line-Breaks: 8-6,7-8,10,12-16,18-20,22-23,30-31,34-40,45-56,59-60,62,67-68,71,73-74,76-77,82-83,85-88,91-32767 From: riese-k3djc@juno.com X-UNTD-BodySize: 9194 X-ContentStamp: 22:11:108889407 X-MAIL-INFO:03053d3d05100d84444d8410846d4190d91534643004745d151111e1d974f58440d4b54d3dd980c14da910a1d5a10d090991c429e42099c0e5e9359190e5e9adc091e061a02100c0 X-UNTD-Peer-Info: 127.0.0.1|localhost|outbound-jn.vgs.untd.com|riese-k3djc@juno.com X-Spam-Score: 0.6 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,NO_REAL_NAME=0.55,UNPARSEABLE_RELAY=0.001 Subject: Re: VLF: 8970 Hz transmissions, soon again here Content-Type: multipart/alternative; boundary=--__JNP_000_3b69.1a72.6d16 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_FONTCOLOR_BLUE, HTML_FONTCOLOR_UNSAFE,HTML_MESSAGE,NO_REAL_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-SCOLL-SCORE: 1:2:483127424:93952408 X-AOL-SCOLL-URL_COUNT: 1 X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-m221.2 ; domain : juno.com DKIM : pass x-aol-sid: 3039ac1d618a4ecffd816d05 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. ----__JNP_000_3b69.1a72.6d16 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit interesting in the old days the Umm condenser for the spark rig was coke bottles held in a strong solution of salt water with the same inside the bottles,,,, not sure how the quality was but they worked bit messy if you tipped it over Bob K3DJC On Fri, 25 Nov 2011 19:04:38 +0100 =?ISO-8859-1?Q?Stefan_Sch=E4fer?= writes: Eddie, VLF, The coil and PA and all the parts are here now and maybe i will do first tests tomorrow in the afternoon on 8970 Hz. The goals would be to resonate on the frequency and apply 50 kV rms or more. Oh i just calculated: My coil has about 550 mH and the antenna 473 pF. So i need about 100 pF from somewhere else, remembering my homemade plate capacitor with the cola bottles as the spacing insolator ;-) The coil has about 320 Ohm DC resistance and if i actually want to apply 50 kV, i would need 1.2 kW for that. No problem for the PA i think. The ERP will be below 1 mW anyway :-( But the background noise is extremely low in the last time and if i can a stable signal over several hours i expect to be visible in many spectrograms. 73, Stefan/DK7FC Am 15.11.2011 22:35, schrieb qrss: Stefan I look forward to your tests, please try and give me a warning even for the spontaneous tests so I can leave my Grabber, http://g3zjo.bplaced.net , on overnight if needed. Also, due to lack of sunshine on the solar panel here, I have been running a dirty earth supply to charge the battery, during tests I can remove this for cleaner signals. 73 Eddie G3ZJO On 15/11/2011 20:09, Stefan Schäfer wrote: VLF, Am 15.11.2011 17:03, schrieb DENNIS EASTERLING: [...] I also have a mini-whip, but this has been extended for VLF purposes. [...] ...which is good since soon there will be some activity again on 8970 Hz. If you like you can join in to the group of successful listeners on the 33 km band. Yesterday i carried my TX coil to the fixed antenna here. Also the PA and variometer part of course. I do inted to use the fixed antenna. I did some calculations about the radiation resistance and losses and power at maximum voltage (50 kV rms on the wire) and found that the ERP will be about 10 dB higher than expected, i.e. i could radiate something in the range of many 100 uW up to 1 mW or theoretically up to 2 mW. We will see and measure. Paul Nicholsen reported about a very senistive receiver in USA that allows long time integration, i.e. not producing a spectrogram but integrating a given TX time into a single bin, like Paul usually does. Here on the fixed antenna i could do night transmissions. 500W TX power key down for 24h is no problem (as long as there is no rain). So i am optimistic and looking forward to some new work on the dreamers band! Also i would be interested if there is (still) some interest in VLF in this group. For Paul, a endless straight "carrier" would be the optimium while a radio amateur may like to have some true ID and maybe a message to be read and displayed. What about the grabber runners and new prepared VLF receiving stations? Probably i will start next week but may do some spontaneous tests before... 73, Stefan/DK7FC PS: I would like to see other VLF transmitting stations as well. What about G3XIZ, DF6NM, OE3GHB, OE5ODL, OK2BVG, DJ8WX? We all could leave some common traces again in the excellent dark spectrogram backgrounds! ____________________________________________________________ 53 Year Old Mom Looks 33 The Stunning Results of Her Wrinkle Trick Has Botox Doctors Worried http://thirdpartyoffers.juno.com/TGL3141/4ecffd408619c8a771m03vuc ----__JNP_000_3b69.1a72.6d16 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
interesting
 
in the old days the Umm condenser for the spark rig was coke bottle= s held = in a strong solution of salt water
with the same inside the bottles,,,, not sure how the quality was b= ut they = worked
bit messy if you tipped it over
 
Bob K3DJC
 
On Fri, 25 Nov 2011 19:04:38 +0100 =3D?ISO-8859-1?Q?Stefan_Sch=3DE4= fer?=3D <Stefan.Schaefer@iu= p.uni-heidelberg.de> = writes:
Eddie, VLF,

The coil and PA and all the parts are here no= w and = maybe i will do first tests tomorrow in the afternoon on 8970 Hz.
=
The = goals would be to resonate on the frequency and apply 50 kV rms or mor= e. Oh i = just calculated: My coil has about 550 mH and the antenna 473 pF. So i= need = about 100 pF from somewhere else, remembering my homemade plate capaci= tor with = the cola bottles as the spacing insolator ;-) The coil has about 320 O= hm DC = resistance and if i actually want to apply 50 kV, i would need 1.2 kW = for = that. No problem for the PA i think. The ERP will be below 1 mW anyway= = :-(

But the background noise is extremely low in the last time = and if i = can a stable signal over several hours i expect to be visible in many = = spectrograms.

73, Stefan/DK7FC

Am 15.11.2011 22:35, schr= ieb = qrss:
Stefan

I look forward to your tests, please try= and give = me a warning even for the spontaneous tests so I can leave my Grabbe= r, http://g3zjo.bplaced.net , on overnight= if = needed. Also, due to lack of sunshine on the solar panel here, I hav= e been = running a dirty earth supply to charge the battery, during tests I c= an = remove this for cleaner signals.

73 Eddie G3ZJO


On= = 15/11/2011 20:09, Stefan Sch=E4fer wrote: =
VLF,

Am 15.11.2011 17:03, schrieb DENNIS EAST= ERLING: =
[...] I also have a mini-whip, but this = has been = extended for
VLF purposes. = [...]

...which is good since soon the= re will = be some activity again on 8970 Hz. If you like you can join in to = the = group of successful listeners on the 33 km band.

Yesterday= i = carried my TX coil to the fixed antenna here. Also the PA and vari= ometer = part of course. I do inted to use the fixed antenna.
I did some= = calculations about the radiation resistance and losses and power a= t = maximum voltage (50 kV rms on the wire) and found that the ERP wil= l be = about 10 dB higher than expected, i.e. i could radiate something i= n the = range of many 100 uW up to 1 mW or theoretically up to 2 mW. We wi= ll see = and measure.

Paul Nicholsen reported about a very senistiv= e = receiver in USA that allows long time integration, i.e. not produc= ing a = spectrogram but integrating a given TX time into a single bin, lik= e Paul = usually does.
Here on the fixed antenna i could do night = transmissions. 500W TX power key down for 24h is no problem (as lo= ng as = there is no rain).

So i am optimistic and looking forward t= o some = new work on the dreamers band!

Also i would be interested = if there = is (still) some interest in VLF in this group. For Paul, a endless= = straight "carrier" would be the optimium while a radio amateur may= like to = have some true ID and maybe a message to be read and displayed. Wh= at about = the grabber runners and new prepared VLF receiving = stations?

Probably i will start next week but may do some = spontaneous tests before...

73, Stefan/DK7FC

PS: I w= ould = like to see other VLF transmitting stations as well. What about G3= XIZ, = DF6NM, OE3GHB, OE5ODL, OK2BVG, DJ8WX? We all could leave some comm= on = traces again in the excellent dark spectrogram = backgrounds!



 


_____________________________= _______________________________
53 Year Old Mom Looks 33
The Stunning Results of Her Wrinkle Trick Has Botox Doctors= Worried
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