Return-Path: Received: from mtain-mk08.r1000.mx.aol.com (mtain-mk08.r1000.mx.aol.com [172.29.97.140]) by air-mc01.mail.aol.com (v129.4) with ESMTP id MAILINMC014-a8ce4d545265218; Thu, 10 Feb 2011 16:02:29 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mk08.r1000.mx.aol.com (Internet Inbound) with ESMTP id 073BA380000C5; Thu, 10 Feb 2011 16:02:27 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Pnddm-0001sP-7K for rs_out_1@blacksheep.org; Thu, 10 Feb 2011 21:01:26 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Pnddl-0001sG-HX for rsgb_lf_group@blacksheep.org; Thu, 10 Feb 2011 21:01:25 +0000 Received: from mail-ww0-f47.google.com ([74.125.82.47]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Pnddj-0003Wg-LD for rsgb_lf_group@blacksheep.org; Thu, 10 Feb 2011 21:01:25 +0000 Received: by wwb39 with SMTP id 39so1804055wwb.28 for ; Thu, 10 Feb 2011 13:01:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:subject:references:from:content-type:x-mailer :in-reply-to:message-id:date:to:content-transfer-encoding :mime-version; bh=RH1+qbumOh2G1D8AQhPsjsuHJcslqphv0JKK2d8Gu1U=; b=EE2VdizxDKsQGMAnEbX0HoeKcRtxDQB+rHB6NH0dcwTYZ1/+RpWGAYKp803Gp0JJnl Az17N9LutqZ16xrQmXziihNqKeXfIQQD/XrYX1Koas59IB7iRc3OGSkov74WJyNyGIJH agMEtoW5/riUXOTLkUxQ159F3s8vY/x2/DLrw= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=subject:references:from:content-type:x-mailer:in-reply-to :message-id:date:to:content-transfer-encoding:mime-version; b=h8ub3c5OjVLHoh23aNdjfQPT2/PCvcTPksZZ/3GNYYAzirrkR1iW2qAXRryoagZjh2 6hPYquiLas3F0wId9W+qf60qopAS8EgiIQw2/s8NPVz/ePN9O/tU6D1EgUrNWZkOyjfX AzQV3lTqAMsFneMXeO10AF8hNIg9tDpuqiQiM= Received: by 10.227.133.11 with SMTP id d11mr8229455wbt.193.1297371677867; Thu, 10 Feb 2011 13:01:17 -0800 (PST) Received: from [192.168.1.101] (cpc3-cmbg14-0-0-cust445.5-4.cable.virginmedia.com [213.106.93.190]) by mx.google.com with ESMTPS id r6sm13275weq.44.2011.02.10.13.01.14 (version=TLSv1/SSLv3 cipher=OTHER); Thu, 10 Feb 2011 13:01:16 -0800 (PST) References: <988315.45122.qm@web28515.mail.ukl.yahoo.com> <00c401cbc94c$79b4ca60$0401a8c0@xphd97xgq27nyf> <1404B701DF084CA18C996DD5F5F07952@White> <845577.75831.qm@web28506.mail.ukl.yahoo.com> From: Roger Lapthorn X-Mailer: iPod Mail (8C148) In-Reply-To: <845577.75831.qm@web28506.mail.ukl.yahoo.com> Message-Id: <6AFD3410-B16D-4871-9F95-97D84E86877C@gmail.com> Date: Thu, 10 Feb 2011 21:02:49 +0000 To: "rsgb_lf_group@blacksheep.org" Mime-Version: 1.0 (iPod Mail 8C148) DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: LF: VLF Transmissions - G3XIZ - 12th / 13th February Content-Type: multipart/alternative; boundary=Apple-Mail-6--910488855 Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=HTML_MESSAGE, TO_ADDRESS_EQ_REAL 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-d016.1 ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d618c4d5452632d99 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --Apple-Mail-6--910488855 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii The stability of "within a few mHz" could be a problem for those of us usi= ng extremely narrow Spectrum Lab settings to dig your signal out if the no= ise Chris. This is where absolute locking to a GPS source is so valuable= as one can screw the bandwidth right down. A few mHz could mean the carri= er drifts and is not detected. Still, I'll be looking! 73s Roger G3XBM Via my 2.4GHz handheld (iPod Touch 4g) On 10 Feb 2011, at 20:21, Chris Osborn wrote: > LF >=20 > Ok chaps so I'll manually cut the carrier and let you know via the refle= ctor the actual times. >=20 > The oven controlled crystal oscillator is running all the time and is qu= ite stable - within a few mHz > provided the shack doesn't experience large temperature variations. >=20 > The mains transformer is quite efficient at 9 kHz surprisingly. > It's a big unit about 180mm cube. > The major problem with it is the noise it generates . . . I could do wit= h some ear defenders ! > I may make a noise-proof box for it. >=20 > 73 Chris G3XIZ >=20 >=20 >=20 >=20 > From: Markus Vester > To: rsgb_lf_group@blacksheep.org > Sent: Thu, 10 February, 2011 19:48:02 > Subject: Re: LF: VLF Transmissions - G3XIZ - 12th / 13th February >=20 > Hi Chris, >=20 > I also think that a carrier interruption may be more suitable than DFCW,= =20 > because it's easy to retain the carrier phase phase, such that a narrow= FFT=20 > can integrate across the gaps. For this to work, it is necessary to let= =20 > oscillator and dividers (!) run through, and apply the keying only to th= e=20 > amplifier. >=20 > Best 73, > Markus (DF6NM) >=20 >=20 > From: mal hamilton > Sent: Thursday, February 10, 2011 7:00 PM > To: rsgb_lf_group@blacksheep.org > Subject: Re: LF: VLF Transmissions - G3XIZ - 12th / 13th February >=20 > Chris > Some sort of ID is necessary. I arranged with OE5ODL to cut carrier for= pos=20 > id. A continuous carrier needs regular cuts. > QRS is preferable to DFCW as an ID tool. > also > regular feedback reporting is also necessary. > g3kev >=20 > ----- Original Message -----=20 > From: Roger Lapthorn > To: rsgb_lf_group@blacksheep.org > Sent: Thursday, February 10, 2011 5:52 PM > Subject: Re: LF: VLF Transmissions - G3XIZ - 12th / 13th February >=20 >=20 > Hi Chris, >=20 > 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=20 > helpful. Don't suppose you can send QRSS60 or similar to help with ID?= Have=20 > passed the word on to Nick G4IKZ as he is closer to you than me and not= sure=20 > he subscribes to this list. >=20 > 73s > Roger G3XBM >=20 >=20 >=20 > On 10 February 2011 14:42, Chris Osborn wrote: >=20 > 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,=20 > hopefully about 50m vertical. >=20 > The frequency will be >=20 > 8.976 66 kHz (i.e. 10.000 MHz / 1114) and is derived from an oven=20 > 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= .=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=20 > but am presently making a more efficient one. >=20 > All reports will be most welcome. >=20 > 73 > Chris G3XIZ >=20 >=20 >=20 --Apple-Mail-6--910488855 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8
The stability of "within a few mHz"= could be a problem for those of us using extremely narrow Spectrum Lab se= ttings to dig your signal out if the noise Chris. This is where absolute= locking to a GPS source is so valuable as one can screw the bandwidth rig= ht down. A few mHz could mean the carrier drifts and is not detected. Stil= l, I'll be looking!

73s
Roger G3XBM

Via my 2.4GHz handheld (iPod Touch 4g)

On 10 Feb= 2011, at 20:21, Chris Osborn <g3x= iz@yahoo.co.uk> wrote:

LF

Ok chaps so I'll manually cut the carrier and let you= know via the reflector the actual times.

The oven controlled cryst= al oscillator is running all the time and is quite stable - within a few= mHz
provided the shack doesn't experience large temperature variations= .

The mains transformer is quite efficient at 9 kHz surprisingly.It's a big unit about 180mm cube.
The major problem with it is the no= ise it generates . . . I could do with some ear defenders !
I may make= a noise-proof box for it.

73 Chris G3XIZ




<= div style=3D"font-family: arial,helvetica,sans-serif; font-size: 13px;">
From: Markus Vester <markusvester@ao= l.com>
To: rsgb_lf_group@blacksheep.org
Sent: Thu, 10 February, 2011 19:48:02Subject: Re: LF: VLF Tr= ansmissions - G3XIZ - 12th / 13th February

Hi Chris,

= I also think that a carrier interruption may be more suitable than DFCW,=
because it's easy to retain the carrier phase phase, such that a narr= ow FFT
can integrate across the gaps. For this to work, it is necessar= y to let
oscillator and dividers (!) run through, and apply the keying= only to the
amplifier.

Best 73,
Markus (DF6NM)


F= rom: mal hamilton
Sent: Thursday, February 10, 2011 7:00 PM
To: rsgb_l= f_group@blacksheep.org
Subject: Re: LF: VLF Transmissions - G3XIZ - 12th / 13th February

Chris
Some sort of ID is necessary= . I arranged with OE5ODL to cut carrier for pos
id. A continuous carri= er needs regular cuts.
QRS is preferable to DFCW as an ID tool.
also=
regular feedback reporting  is also necessary.
g3kev

--= --- Original Message -----
From: Roger Lapthorn
To: rsgb_lf_group@black= sheep.org
Sent: Thursday, February 10, 2011 5:52 PM
Subject:= Re: LF: VLF Transmissions - G3XIZ - 12th / 13th February


Hi Ch= ris,

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 close= r 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 permittin= g 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 oscil= lator.
Hopefully the frequency will be more stable than last time.
I= f this frequency proves unsuitable I can transmit on 10.000 MHZ / 1112 .=
.10.000 MHz / 1116  etc.

I shall send a continuous carrie= r 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 we= lcome.

73
Chris G3XIZ



=3D --Apple-Mail-6--910488855--