Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-me03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 48EA338000090; Sat, 26 Nov 2011 05:18:32 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RUFJy-0001fm-0f for rs_out_1@blacksheep.org; Sat, 26 Nov 2011 10:17:22 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RUFJx-0001fd-D3 for rsgb_lf_group@blacksheep.org; Sat, 26 Nov 2011 10:17:21 +0000 Received: from out1.ip01ir2.opaltelecom.net ([62.24.128.237]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1RUFJu-0007qJ-Rh for rsgb_lf_group@blacksheep.org; Sat, 26 Nov 2011 10:17:21 +0000 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Aq0AAIy70E5cF/ci/2dsb2JhbABEgk2YA4USix2BBoFtBQEBBQgBAQNJAg8dAQEDBQIBAxEEAQEKJRQBBBoGFggGEwoBAgIBAYd2thyKYgSCXIUUhHQnAZlJ X-IronPort-AV: E=Sophos;i="4.69,575,1315177200"; d="scan'208,217";a="372908299" Received: from host-92-23-247-34.as13285.net (HELO xphd97xgq27nyf) ([92.23.247.34]) by out1.ip01ir2.opaltelecom.net with SMTP; 26 Nov 2011 10:17:12 +0000 Message-ID: <002d01ccac24$8ebd1be0$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: References: ,<66E491BAB91C48AF81191F4022525A14@DennisPC> <6FE757960E6C447781689D4F19A315AE@DennisPC> <4EC2C6EB.2080201@iup.uni-heidelberg.de> <4EC2DB14.9000807@talktalk.net> <4ECFD8B6.2050601@iup.uni-heidelberg.de> Date: Sat, 26 Nov 2011 10:17:09 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: VLF: 8970 Hz transmissions, soon again here Content-Type: multipart/alternative; boundary="----=_NextPart_000_002A_01CCAC24.8E6733B0" 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_20_30,HTML_MESSAGE 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: 0:2:498671808:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d608b4ed0bcf85541 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. ------=_NextPart_000_002A_01CCAC24.8E6733B0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Stefan If I can hear/see your signal I will call on 7033 Khz with a report and = you can reply on 8970. I will let you know what speed I can receive you = at. I will increase speed until you disappear.=20 For interest to all, 40 metres is excellent at present to the USA, W2RE = is on CW 7033 at 599, this could be a good sign for MF es LF today de mal/g3kev ----- Original Message -----=20 From: Stefan Sch=E4fer=20 To: rsgb_lf_group@blacksheep.org=20 Cc: Paul=20 Sent: Friday, November 25, 2011 6:04 PM Subject: Re: VLF: 8970 Hz transmissions, soon again here Eddie, VLF,=20 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.=20 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:=20 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 Sch=E4fer wrote:=20 VLF, Am 15.11.2011 17:03, schrieb DENNIS EASTERLING:=20 [...] 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.=20 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.=20 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.=20 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!=20 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! ------=_NextPart_000_002A_01CCAC24.8E6733B0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Stefan
If I can hear/see your signal I will call on = 7033 Khz with=20 a report and you can reply on 8970. I will let you know what speed I can = receive=20 you at. I will increase speed until you disappear.
For interest to all, 40 metres is excellent at = present to=20 the USA, W2RE is on CW 7033 at 599, this could be a good sign for MF es = LF=20 today
de mal/g3kev
 
----- Original Message -----
From:=20 Stefan = Sch=E4fer
Cc: Paul
Sent: Friday, November 25, 2011 = 6:04=20 PM
Subject: Re: VLF: 8970 Hz = transmissions,=20 soon again here

Eddie, VLF,

The coil and PA and all the parts = are here=20 now and maybe i will do first tests tomorrow in the afternoon on 8970 = Hz.=20

The goals would be to resonate on the frequency and apply 50 = kV rms or=20 more. Oh i just calculated: My coil has about 550 mH and the antenna = 473 pF.=20 So i need about 100 pF from somewhere else, remembering my homemade = plate=20 capacitor with the cola bottles as the spacing insolator ;-) The coil = has=20 about 320 Ohm DC resistance and if i actually want to apply 50 kV, i = would=20 need 1.2 kW for that. No problem for the PA i think. The ERP will be = below 1=20 mW anyway :-(

But the background noise is extremely low in the = last=20 time and if i can a stable signal over several hours i expect to be = visible in=20 many spectrograms.

73, Stefan/DK7FC

Am 15.11.2011 22:35, = schrieb=20 qrss:=20
Stefan

I look forward to your tests, please try = and give=20 me a warning even for the spontaneous tests so I can leave my = Grabber, http://g3zjo.bplaced.net , on overnight = if=20 needed. Also, due to lack of sunshine on the solar panel here, I = have been=20 running a dirty earth supply to charge the battery, during tests I = can=20 remove this for cleaner signals.

73 Eddie G3ZJO


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

Am 15.11.2011 17:03, schrieb DENNIS = EASTERLING:=20
[...] I also have a mini-whip, but this = has been=20 extended for
VLF purposes.=20 [...]

...which is good since soon = there will=20 be some activity again on 8970 Hz. If you like you can join in to = the=20 group of successful listeners on the 33 km band.

Yesterday = i=20 carried my TX coil to the fixed antenna here. Also the PA and = variometer=20 part of course. I do inted to use the fixed antenna.
I did some = calculations about the radiation resistance and losses and power = at=20 maximum voltage (50 kV rms on the wire) and found that the ERP = will be=20 about 10 dB higher than expected, i.e. i could radiate something = in the=20 range of many 100 uW up to 1 mW or theoretically up to 2 mW. We = will see=20 and measure.

Paul Nicholsen reported about a very = senistive=20 receiver in USA that allows long time integration, i.e. not = producing a=20 spectrogram but integrating a given TX time into a single bin, = like Paul=20 usually does.
Here on the fixed antenna i could do night=20 transmissions. 500W TX power key down for 24h is no problem (as = long as=20 there is no rain).

So i am optimistic and looking forward = to some=20 new work on the dreamers band!

Also i would be interested = if there=20 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=20 have some true ID and maybe a message to be read and displayed. = What about=20 the grabber runners and new prepared VLF receiving=20 stations?

Probably i will start next week but may do some=20 spontaneous tests before...

73, Stefan/DK7FC

PS: I = would=20 like to see other VLF transmitting stations as well. What about = G3XIZ,=20 DF6NM, OE3GHB, OE5ODL, OK2BVG, DJ8WX? We all could leave some = common=20 traces again in the excellent dark spectrogram=20 = backgrounds!



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