Return-Path: Received: from mtain-mc05.r1000.mx.aol.com (mtain-mc05.r1000.mx.aol.com [172.29.96.77]) by air-dd09.mail.aol.com (v129.4) with ESMTP id MAILINDD094-86b14d1dc27e2d8; Fri, 31 Dec 2010 06:46:06 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mc05.r1000.mx.aol.com (Internet Inbound) with ESMTP id 475E9380000AB; Fri, 31 Dec 2010 06:46:03 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PYdQ3-0000G5-15 for rs_out_1@blacksheep.org; Fri, 31 Dec 2010 11:45:15 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PYdQ2-0000Fw-Ah for rsgb_lf_group@blacksheep.org; Fri, 31 Dec 2010 11:45:14 +0000 Received: from out1.ip02ir2.opaltelecom.net ([62.24.128.238]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PYdQ0-0005mF-70 for rsgb_lf_group@blacksheep.org; Fri, 31 Dec 2010 11:45:14 +0000 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AgEGAJRQHU1cEYLA/2dsb2JhbACCIoFOjiWGeIMVAYgac695jzWEVnQEgWCMW4Jb X-IronPort-AV: E=Sophos;i="4.60,254,1291593600"; d="scan'208,217";a="350183360" Received: from unknown (HELO xphd97xgq27nyf) ([92.17.130.192]) by out1.ip02ir2.opaltelecom.net with SMTP; 31 Dec 2010 11:45:05 +0000 Message-ID: <006e01cba8e0$2aa5f110$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: References: <15858.38665.qm@web28513.mail.ukl.yahoo.com> <186099.35378.qm@web28511.mail.ukl.yahoo.com> <979229.75434.qm@web28510.mail.ukl.yahoo.com> Date: Fri, 31 Dec 2010 11:45:04 -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: LF: VLF - G3XIZ transmitting today Content-Type: multipart/alternative; boundary="----=_NextPart_000_006B_01CBA8E0.2A789F80" 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-sid: 3039ac1d604d4d1dc27b4aa5 X-AOL-IP: 195.171.43.25 ------=_NextPart_000_006B_01CBA8E0.2A789F80 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Chris I would say the wire gauge is too fragile. I would use around 1mm wire= plastic covered or enamelled, apart from the lower loss you need it= to be robust. I use 2.5mm pvc covered wire on all my antennas even the long horizont= al runs and these survive the severe snow and frost and do not snap in= the gales. You do not mention balloon size but 4 should carry 1mm wire plus light= weight marine grade anchor cord. mal/g3kev ----- Original Message -----=20 From: Chris Osborn=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Friday, December 31, 2010 11:08 AM Subject: Re: LF: VLF - G3XIZ transmitting today Ok Gary, There's 50m of balloon aerial aloft now but one of the 4 ballooons= has just burst. It must have touched the wire. Hopefully the others will hold out. I think I may try heavier wire next time as 0.2 mm is very difficult= to handle. 73 Chris XIZ ----------------------------------------------------------------------= -------- From: Gary - G4WGT To: rsgb_lf_group@blacksheep.org Sent: Fri, 31 December, 2010 10:57:06 Subject: Re: LF: VLF - G3XIZ transmitting today Chris, Just read the mail (1050utc) & I have adjusted my loop Rx system to= your frequency running SpecLab at QRS600, 4.5mHz. 73, Gary - G4WGT - IO83qo. LF MF Grabber - Web Site - Blogspot - 9kHz Grabber On 31 December 2010 10:07, Chris Osborn wrote: All noted Andy. The aerial current is about 0.15A The frequency is drifting slightly due to shack cooling and is now= =20 8.971 870 kHz I'll try the balloon aerial in about half an hour then switch to= slow QRSS. 73 Chris XIZ ----------------------------------------------------------------------= ------ From: Andy Talbot To: rsgb_lf_group@blacksheep.org Sent: Fri, 31 December, 2010 9:43:41 Subject: Re: LF: VLF - G3XIZ transmitting today Thinking about that -=20 Its exactly what I did with my first 73khz SLOWCW Tx prog back in= 1997. SLOWCW was generated, and a part of the 'mark' signal consist= ed of the callsign being sent at normal CW speeds for identification.= G3PLX could see this fast CW on his received warerfall as a definte= reduction in carrier power. =20 On 31 December 2010 09:39, Andy Talbot wrot= e: SDR-IQ is running, with a 20Hz wide waterfall looking in 0.03Hz= FFT bin size. It took 5 minutes for a calibration signal to show up on the scr= een. The paint is drying - slowly :-)0 If you want to send QRSS identifier at high speeds (relative) ,= suggest you repeat at 10 or 15 minute regular intervals. They will= then show up up as periodic reductions in carrier level of about 3dB= or so. If fact, tht just may be a suitable task for a new bit of softwa= re or a PIC - a mixed QRSSSSSS generator Andy www.g4jnt.com =20 On 31 December 2010 08:44, Chris Osborn wrot= e: LF, I shall be transmitting VLF today starting at 09.00 Z Freq: 8.971 855 kHz (nominal but close) Mode : Continuous carrier with occasional QRSS identifier Aerial: Initially: 40m inverted 'L' at 10m =20 Later: balloon supported aerial at 50m Hopefully the system will keep going as the loading coil re-wi= nd=20 seems to have done the trick now that the varnish has dried. 73 Chris=20 G3XIZ --=20 ------=_NextPart_000_006B_01CBA8E0.2A789F80 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable
Chris
I would say the wire gauge is too fra= gile. I would=20 use around 1mm wire plastic covered or enamelled, apart from the lower= loss you=20 need it to be robust.
I use 2.5mm pvc covered wire on all= my antennas=20 even the long horizontal runs and these survive the severe snow and fr= ost and do=20 not snap in the gales.
You do not mention balloon size but= 4 should carry=20 1mm wire plus lightweight marine grade anchor cord.
 
mal/g3kev
 
----- Original Message -----
From:=20 Chris= Osborn=20
Sent: Friday, December 31, 20= 10 11:08=20 AM
Subject: Re: LF: VLF - G3XIZ= transmitting=20 today

Ok Gary,

There's 50m of balloon aerial aloft now but one= of the 4=20 ballooons has just burst.
It must have touched the wire.
Hopef= ully the=20 others will hold out.

I think I may try heavier wire next tim= e as 0.2=20 mm is very difficult to handle.

73 Chris XIZ

From: Gary - G4WGT= <g4wgt@tiscali.co.uk>
To: rsgb_lf_group@blacksh= eep.org
Sent: Fri, 31 December, 2010=20 10:57:06
Subject:= Re: LF: VLF=20 - G3XIZ transmitting today

Chris,

Just read the mail (1050utc) & I have adjusted my loop Rx= system to=20 your frequency running SpecLab at QRS600, 4.5mHz.

73,

Gary - G4WGT - IO83qo.

=



On 31 December 2010 10:07, Chris Osborn <g3xiz@yaho= o.co.uk> wrote:
All noted Andy.

The aerial current is about 0.15A
T= he=20 frequency is drifting slightly due to shack cooling and is now 8.971 870=20 kHz

I'll try the balloon aerial in about half an hour then= switch to=20 slow QRSS.

73 Chris XIZ

From: Andy Talbot= <andy.g4jnt@g= mail.com>
To: rsgb_lf_group@blacksheep.org
Sent: Fri, 31 December, 2010=20 9:43:41
Subject: Re: LF:=20 VLF - G3XIZ transmitting today

Thinking about that -
Its exactly what I did with my first 73khz SLOWCW Tx&nbs= p; prog=20 back in 1997.   SLOWCW was generated, and a part of the= 'mark'=20 signal consisted of the callsign being sent at normal CW speeds fo= r=20 identification.   G3PLX could see this fast CW on his re= ceived=20 warerfall as a definte reduction in carrier power.

 
On 31 December 2010 09:39, Andy Talbot <andy.g4jnt@gmail.com>=20 wrote:
SDR-IQ is running, with a 20Hz wide waterfall looking in 0.= 03Hz FFT=20 bin size.
It took 5 minutes for a calibration signal to show up= on the=20 screen.
The paint is drying - slowly :-)0
 
If you want to send QRSS identifier at high speeds (relativ= e) ,=20 suggest you repeat at 10 or 15 minute regular intervals.&= nbsp; They=20 will then show up up as periodic reductions in carrier level of= about 3dB=20 or so.
 
If fact, tht just may be a suitable task for a new bit of= software or=20 a PIC - a mixed QRSSSSSS generator
 
 
Andy


 
On 31 December 2010 08:44, Chris Osborn= <g3xiz@yahoo.co.uk>=20 wrote:
LF,

I shall be transmitting VLF today starting at= 09.00=20 Z

Freq:    8.971 855 kHz (nominal but=20 close)
Mode : Continuous carrier with occasional QRSS=20 identifier
Aerial:  Initially:  40m inverted 'L'= at=20 10m =20
         &nbs= p;=20 Later:     balloon supported aerial at=20 50m

Hopefully the system will keep going as the loading= coil=20 re-wind
seems to have done the trick now that the varnish= has=20 dried.

73
Chris=20
G3XIZ


=


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