Return-Path: Received: from mtain-mb07.r1000.mx.aol.com (mtain-mb07.r1000.mx.aol.com [172.29.96.27]) by air-dd03.mail.aol.com (v129.4) with ESMTP id MAILINDD032-86314d54e37b23; Fri, 11 Feb 2011 02:21:31 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mb07.r1000.mx.aol.com (Internet Inbound) with ESMTP id B54E03800009E; Fri, 11 Feb 2011 02:21:29 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PnnHd-0005mH-Bv for rs_out_1@blacksheep.org; Fri, 11 Feb 2011 07:19:13 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PnnHc-0005m8-Jr for rsgb_lf_group@blacksheep.org; Fri, 11 Feb 2011 07:19:12 +0000 Received: from nm7-vm0.bullet.mail.ukl.yahoo.com ([217.146.183.236]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1PnnHc-0006Y1-HY for rsgb_lf_group@blacksheep.org; Fri, 11 Feb 2011 07:19:12 +0000 Received: from [217.146.183.217] by nm7.bullet.mail.ukl.yahoo.com with NNFMP; 11 Feb 2011 07:19:06 -0000 Received: from [217.146.183.160] by tm10.bullet.mail.ukl.yahoo.com with NNFMP; 11 Feb 2011 07:19:06 -0000 Received: from [127.0.0.1] by omp1001.mail.ukl.yahoo.com with NNFMP; 11 Feb 2011 07:19:06 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 424914.68224.bm@omp1001.mail.ukl.yahoo.com Received: (qmail 92088 invoked by uid 60001); 11 Feb 2011 07:19:06 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.co.uk; s=s1024; t=1297408746; bh=KjvNfQskVEQ/rJnZrHH/HPap6m5Lw3wiu2f0TbQC358=; h=Message-ID:X-YMail-OSG:Received:X-Mailer:References:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=FVAQ6paR/hv0/GOjZIwvWxXNGRjvQ/RMtqGlWUvth0lzIjDwOXBgPzvmURfNTFiuKjYebg5w0IUKcc3BBiF6PLzPb0HIiaT/y6YlNv1SP49LWN5u4dC8BEKhKCIbXW/CEAf7Qnv2VyVUULu65RiupFRYO7kFBVhiV/RQMoJ1ESs= 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=JsZuihKWuzles24HNvPxb/ffAJ603R9O1FZQTv9KonxDvxyR+I0k27JkM8BECIx2s6G67pWPrOWFCoznnN3k0k3q35eoB6bzxbchTZY64zHqLvKU6N5+yQJBh6XKbB70y/vXEUr4tP/Bjo33p0EZhlqker4cIbxuGMLI7RfN5cY=; Message-ID: <167285.86652.qm@web28512.mail.ukl.yahoo.com> X-YMail-OSG: yfy_bksVM1lXyDdRDtqufiUKQv9B5lQ8jj.x6f0f04muFGx H3xpcPxvGdFZxv1zhylaNA4f1zQobnyUeN7m1IfF_RTquu5mQptPF4X4GFnq MEkcGtuiXy5JH3smd3LgIFHbL6bJj38DEiPu7yprfRgsNjR04YgUpRM0ApHQ xDLcquh5wL.rGTo6.KeApxwapSob6nOarqDWQA2BWpT7rFdpncCpPL8UzOPJ cH1.mBMOpitnzAhKmecarFltSaUPmIv9NpRUsyGW3JDTOk6H06YHphrsCpNX 1XkwDXKA0oI2SxmgulxZx Received: from [81.97.191.183] by web28512.mail.ukl.yahoo.com via HTTP; Fri, 11 Feb 2011 07:19:06 GMT X-Mailer: YahooMailRC/555 YahooMailWebService/0.8.108.291010 References: <988315.45122.qm@web28515.mail.ukl.yahoo.com> <00c401cbc94c$79b4ca60$0401a8c0@xphd97xgq27nyf> <1404B701DF084CA18C996DD5F5F07952@White> <845577.75831.qm@web28506.mail.ukl.yahoo.com> <6AFD3410-B16D-4871-9F95-97D84E86877C@gmail.com> Date: Fri, 11 Feb 2011 07:19:06 +0000 (GMT) From: Chris Osborn To: rsgb_lf_group@blacksheep.org In-Reply-To: MIME-Version: 1.0 DomainKey-Status: good (testing) Subject: Re: LF: VLF Transmissions - G3XIZ - 12th / 13th February Content-Type: multipart/alternative; boundary="0-2098691911-1297408746=:86652" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,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-AUTHENTICATION: mail_rly_antispam_dkim-d004.2 ; domain : yahoo.co.uk DKIM : pass x-aol-sid: 3039ac1d601b4d54e3793e48 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --0-2098691911-1297408746=:86652 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Roger, Jim, Marcus, LF I shall try to stabilize the shack temperature and keep frequency drift to= a=20 minimum. The new TX uses a 10.000 MHz oscillator followed by a G4JNT divider (RadCo= m Sept=20 2010) Thus I can transmit frequencies of 10.000 MHZ divided by even numbers e.g.= 1112,=20 1114, 1116 . . . I intend to build an off-air standard, 10 MHz output and locked to Droitwi= ch=20 (198 kHz) but the PLL IC's have taken weeks to arrive (from Korea via E-Bay). My TX OCXO is an ex-equipment unit (from China via E-Bay) PIEZO, Carlisle, PA. Mod 29201326 10.000 MHZ I must confess that I'd assumed that the frequency stability with changing= =20 ambient temperatures would be better than it seems to be. 73 Chris G3XIZ ________________________________ From: Markus Vester To: rsgb_lf_group@blacksheep.org Sent: Thu, 10 February, 2011 21:32:25 Subject: Re: LF: VLF Transmissions - G3XIZ - 12th / 13th February Hi Chris, what sort of 10 MHz OCXO do you have? The little canned industr= ial=20 types (eg. http://www.kvg-gmbh.de/10.0.html?&L=3D3 ) will stay within abo= ut=20 a couple of ppb over hours, translating to some 10 microHz at VLF.=20 =20 Best 73, Markus (DF6NM) From: Roger Lapthorn=20 Sent: Thursday, February 10, 2011 10:02 PM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: VLF Transmissions - G3XIZ - 12th / 13th February The stability of "within a few mHz" could be a problem for those of us us= ing=20 extremely narrow Spectrum Lab settings to dig your signal out if the noise= =20 Chris. This is where absolute locking to a GPS source is so valuable as on= e can =20 screw the bandwidth right down. A few mHz could mean the carrier drifts an= d is =20 not detected. Still, I'll be looking! 73s Roger G3XBM ... =20 --0-2098691911-1297408746=:86652 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Roger, Jim, Marcus, LF

I shall try to stabilize the shack= temperature and keep frequency drift to a minimum.

The new TX uses= a 10.000 MHz oscillator followed by a G4JNT divider (RadCom Sept 2010)Thus I can transmit frequencies of 10.000 MHZ divided by even numbers e.g= . 1112, 1114, 1116  . . .

I intend to build an off-air standar= d, 10 MHz output and locked to Droitwich (198 kHz) but the PLL IC's
hav= e taken weeks to arrive (from Korea via E-Bay).

My TX OCXO is an ex= -equipment unit (from China via E-Bay)

PIEZO, Carlisle, PA.
Mod= 29201326
10.000 MHZ

I must confess that I'd assumed that the fr= equency stability with changing ambient temperatures would be
better th= an it seems to be.

73 Chris G3XIZ



<= font face=3D"Tahoma" size=3D"2">
From: Markus Vester <markusvester@aol.com>
= To: rsgb_lf_group@blacksh= eep.org
Sent: Thu, 10= February, 2011 21:32:25
Subject:= Re: LF: VLF Transmissions - G3XIZ - 12th / 13th February

=20
Hi Chris, what sort of 10 MHz OCXO do= you have? The=20 little canned industrial types (eg. http://www.kvg-gmbh.de/10.0.html?&L=3D3 )=20 will stay within about a couple of ppb=20 over hours, translating to some 10=20 microHz at VLF. 
 
Best 73, Markus (DF6NM)

Sent: Thursday, February 10, 2011 10:02 PM
Subject: Re: LF: VLF Transmissions - G3XIZ - 12th / 13th=20 February

The stability of "within a few mHz" could be a problem for those of= us=20 using extremely narrow Spectrum Lab settings to dig your signal out if the= noise=20 Chris. This is where absolute locking to a GPS source is so valuable as on= e can=20 screw the bandwidth right down. A few mHz could mean the carrier drifts an= d is=20 not detected. Still, I'll be looking!

73s
Roger G3XBM

...

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