Return-Path: Received: from mtain-mj09.r1000.mx.aol.com (mtain-mj09.r1000.mail.aol.com [172.21.164.93]) by air-md01.mail.aol.com (v129.4) with ESMTP id MAILINMD013-8b764d543b853e7; Thu, 10 Feb 2011 14:24:53 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mj09.r1000.mx.aol.com (Internet Inbound) with ESMTP id EE8BB38000159; Thu, 10 Feb 2011 14:24:49 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Pnc7R-0000oh-6a for rs_out_1@blacksheep.org; Thu, 10 Feb 2011 19:23:57 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Pnc7Q-0000oY-8N for rsgb_lf_group@blacksheep.org; Thu, 10 Feb 2011 19:23:56 +0000 Received: from nm8-vm0.bullet.mail.ukl.yahoo.com ([217.146.183.238]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1Pnc7Q-0002oV-3h for rsgb_lf_group@blacksheep.org; Thu, 10 Feb 2011 19:23:56 +0000 Received: from [217.146.183.209] by nm8.bullet.mail.ukl.yahoo.com with NNFMP; 10 Feb 2011 19:23:50 -0000 Received: from [217.146.183.40] by tm2.bullet.mail.ukl.yahoo.com with NNFMP; 10 Feb 2011 19:23:50 -0000 Received: from [127.0.0.1] by omp1025.mail.ukl.yahoo.com with NNFMP; 10 Feb 2011 19:23:50 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 27507.50669.bm@omp1025.mail.ukl.yahoo.com Received: (qmail 16875 invoked by uid 60001); 10 Feb 2011 19:23:49 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.co.uk; s=s1024; t=1297365829; bh=+Ni5j6EmoKmoxtWVJr5MoruscRMgCGtPjvFWuR39rOU=; h=Message-ID:X-YMail-OSG:Received:X-Mailer:References:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=HavaaegEW3zAuEE2k8DwjG5Q8whnKecSJKzdhJ8ylKkkFj8Ir6vOA4rMMU7BdXJkrrpi9IWJumcceuyByu+nIhe3QSIxHR5qcFrc3KgWZHv603OlDbhlihziaplgTyM6nF/iGt4mrqW4IQA9uucI9hrZzYzaBkmgrRZc78mxejY= DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.co.uk; h=Message-ID:X-YMail-OSG:Received:X-Mailer:References:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=vNWfa6t9O+/MByvcHtZPg6IQVWJ6VX6HOKHkh5qwqFr0Pc9MTA6sfNUF2wyN3eIAdzpB9PNO2CprEVLAq4gSENwCZ5H+p6MOIII1KulgZQIBZH9gmWkv0DSqL2XjJMiNAbQI4fscBLenM+0U78qWYOZaWs2BI13jD1KW7Ot7npw=; Message-ID: <673772.16865.qm@web28515.mail.ukl.yahoo.com> X-YMail-OSG: PvHJk8wVM1m_XcFcwc27sl8YxxjLzZpVNPH1K5yd9TE8gu7 xhlafzI0ir9nj98o2hUgegYK5zjqNMgYMwZ51kfqH8dR7EzjX8fUXoIv1uhv nwViOoN3HDS9TD2a2nhP1NkMiHwH6RGUQ8qb6yMTZWqUiE7kU1y9u.NnS4Di _SGj2slQMWlDb9bIA1PI0CXLeyb3iil5Dx85a7tOrdi2T43Px0LYhqESe6_m LNKKxoa.ThPbetouk4uWYcto25iBCt1hEQXTRGa3lYEnbKkvBY58ST_4SDVp bykVCT527oLE1PLpaAQ-- Received: from [81.97.191.183] by web28515.mail.ukl.yahoo.com via HTTP; Thu, 10 Feb 2011 19:23:49 GMT X-Mailer: YahooMailRC/555 YahooMailWebService/0.8.108.291010 References: <988315.45122.qm@web28515.mail.ukl.yahoo.com> <4D5436DE.3040602@iup.uni-heidelberg.de> Date: Thu, 10 Feb 2011 19:23:49 +0000 (GMT) From: Chris Osborn To: rsgb_lf_group@blacksheep.org In-Reply-To: <4D5436DE.3040602@iup.uni-heidelberg.de> MIME-Version: 1.0 DomainKey-Status: good (testing) Subject: Re: LF: VLF Transmissions - G3XIZ - 12th / 13th February Content-Type: multipart/alternative; boundary="0-888332374-1297365829=:16865" 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=HTML_50_60,HTML_MESSAGE, HTML_TAG_EXISTS_TBODY 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-AUTHENTICATION: mail_rly_antispam_dkim-d025.1 ; domain : yahoo.co.uk DKIM : pass x-aol-sid: 3039400c89b24d543b8155fb X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --0-888332374-1297365829=:16865 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Mal, Roger, Stefan and group Thanks for the good wishes. It will all depend on weather conditions as to whether I can fly the ballo= ons=20 but I shall keep you posted via the reflector. I can try longer QRSS periods but begrudge the long wasted 'off' times=20 especially if I'm having trouble keeping the balloons aloft. A compromise would be for me to manually cut the carrier for 5-10 minute= =20 periods. The transmitter feeds the loading coil and aerial via a large step up (mai= ns)=20 transformer. The TX/ transformer will push its RF power into 2000 - 3000 ohms which is= an=20 approximation of the aerial circuit resistance when resonant.. I tried using a 50 ohms TX output and link coupling to the loading coil bu= t=20 without success. The aerial current should be as before about 0.15 - 0.2 A 73 Chris G3XIZ ________________________________ From: Stefan Sch=E4fer To: rsgb_lf_group@blacksheep.org Sent: Thu, 10 February, 2011 19:05:02 Subject: Re: LF: VLF Transmissions - G3XIZ - 12th / 13th February Hi Chris,=20 I think DFCW-600 or even 2400 is a good compromise between a constant carr= ier=20 and some ID but 60 is probably to fast. Jim received you in less than 2 mH= z if i=20 remember correctly. QRSS60 is to fast for that. Looking forward to your re= sults=20 :-) 73, Stefan Am 10.02.2011 18:52, schrieb Roger Lapthorn:=20 Hi Chris, > >Very good luck. I'll be looking for you and hoping for success this time.= =20 > >An email direct and to this group saying when TX starts/ends would be hel= pful.=20 >Don't suppose you can send QRSS60 or similar to help with ID? Have passed= the=20 >word on to Nick G4IKZ as he is closer to you than me and not sure he subs= cribes=20 >to this list. > >73s >Roger G3XBM > > > >On 10 February 2011 14:42, Chris Osborn wrote: > >LF, >>=20 >>I have had permission to transmit on VLF this coming weekend: 12th and= 13th=20 >>February. >>Weather permitting I shall try again with my balloon-launched aerial, ho= pefully=20 >>about 50m vertical. >>=20 >>The frequency will be=20 >>=20 >>8.976 66 kHz (i.e. 10.000 MHz / 1114) and is derived from an oven contr= olled=20 >>xtal oscillator. >>Hopefully the frequency will be more stable than last time. >>If this frequency proves unsuitable I can transmit on 10.000 MHZ / 1112= .=20 >>.10.000 MHz / 1116 etc. >>=20 >>I shall send a continuous carrier as and when conditions permit. >>=20 >>My newly built VLF TX is working well and can deliver about 150 watts of= RF. >>On this occasion I shall be using the original (fairly lossy) loading co= il but=20 >>am presently making a more efficient one. >>=20 >>All reports will be most welcome. >>=20 >>73 >>Chris G3XIZ >>=20 >>=20 >> > > >--=20 >g3xbm-qrp.blogspot.com/ >www.g3xbm.co.uk >www.youtube.com/user/g3xbm >G3XBM GQRP 1678 ISWL G11088 > >=20 > =20 > > =20 > =20 > =20 > =20 > > =20 > =20 > > =20 > =20 > > =20 =20 --0-888332374-1297365829=:16865 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Mal, Roger, Stefan and group

Thanks for the good wishes.
It= will all depend on weather conditions as to whether I can fly the balloon= s but I shall keep you posted via the reflector.

I can try longer= QRSS periods but begrudge the long wasted 'off' times especially if I'm= having trouble keeping the balloons aloft.
A compromise would be for= me to manually cut the carrier for 5-10 minute periods.

The transm= itter feeds the loading coil and aerial via a large step up (mains) transf= ormer.
The TX/ transformer will push its RF power into 2000 - 3000 ohms= which is an approximation of the aerial circuit resistance when resonant.= .
I tried using a 50 ohms TX output and link coupling to the loading co= il but without success.

The aerial current should be as before abou= t 0.15 - 0.2 A

73
Chris G3XIZ


Fr= om: Stefan Sch=E4fer <schaefer@iup.uni-heidelberg.de>
= To: rsgb_lf_group@blacksh= eep.org
Sent: Thu, 10= February, 2011 19:05:02
Subject:= Re: LF: VLF Transmissions - G3XIZ - 12th / 13th February

=20 Hi Chris,

I think DFCW-600 or even 2400 is a good compromise between a constant carrier and some ID but 60 is probably to fast. Jim received you in less than 2 mHz if i remember correctly. QRSS60 is to fast for that. Looking forward to your results :-)

73, Stefan

Am 10.02.2011 18:52, schrieb Roger Lapthorn:
Hi Chris,

Very good luck. I'll be looking for you and hoping for success this time.

An email direct and to this group saying when TX starts/ends would be helpful. Don't suppose you can send QRSS60 or similar to help with ID? Have passed the word on to Nick G4IKZ as he is closer to you than me and not sure he subscribes to this list.

73s
Roger G3XBM


On 10 February 2011 14:42, Chris Osborn <g3xiz@yahoo.co.uk= > wrote:
LF,
 
I have had permission to transmit on VLF this coming weekend: 12th and 13th February.
Weather permitting I shall try again with my balloon-launched aerial, hopefully about 50m vertical.
 
The frequency will be
 
8.976 66 kHz  (i.e. 10.000 MHz / 1114) and is derived from an oven controlled xtal oscillator.
Hopefully the frequency will be more stable than last time.
If this frequency proves unsuitable I can transmit on 10.000 MHZ / 1112 . .10.000 MHz / 1116  etc.
 
I shall send a continuous carrier as and when conditions permit.
 
My newly built VLF TX is working well and can deliver about 150 watts of RF.
On this occasion I shall be using the original (fairly lossy) loading coil but am presently making a more efficient one.
 
All reports will be most welcome.
 
73
Chris G3XIZ
 
 




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ww= w.g3xbm.co.uk
www.youtube.com/user/g3xbm
G3XBM   GQRP 1678    ISWL G11088
=3D""
   <= /td>

 
3D""   3D""      
 
 




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