Return-Path: Received: from mtain-me06.r1000.mx.aol.com (mtain-me06.r1000.mx.aol.com [172.29.96.142]) by air-mc03.mail.aol.com (v129.4) with ESMTP id MAILINMC032-a8dc4ceabaabbe; Mon, 22 Nov 2010 13:47:07 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-me06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 17CA838000137; Mon, 22 Nov 2010 13:47:05 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PKbOT-0001a4-7R for rs_out_1@blacksheep.org; Mon, 22 Nov 2010 18:45:37 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PKbOS-0001Zv-JN for rsgb_lf_group@blacksheep.org; Mon, 22 Nov 2010 18:45:36 +0000 Received: from nm13.bullet.mail.ukl.yahoo.com ([217.146.183.187]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1PKbOS-0006Hu-BK for rsgb_lf_group@blacksheep.org; Mon, 22 Nov 2010 18:45:36 +0000 Received: from [217.146.183.181] by nm13.bullet.mail.ukl.yahoo.com with NNFMP; 22 Nov 2010 18:45:30 -0000 Received: from [217.146.183.73] by tm12.bullet.mail.ukl.yahoo.com with NNFMP; 22 Nov 2010 18:45:30 -0000 Received: from [127.0.0.1] by omp1034.mail.ukl.yahoo.com with NNFMP; 22 Nov 2010 18:45:30 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 711739.18651.bm@omp1034.mail.ukl.yahoo.com Received: (qmail 43864 invoked by uid 60001); 22 Nov 2010 18:45:30 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.co.uk; s=s1024; t=1290451530; bh=nR0TuOuf52+YpMly7FmfzNbAyMY4TuYlCWwCSwzpqcQ=; h=Message-ID:X-YMail-OSG:Received:X-Mailer:References:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=gFQE86i4jYMUZFYmCOoiElpyFA5id4AqmAkqaT/mAbDGpUVOdQmo2NxKQG8f7vrQBfd9iYs9CHMtBID4LDcPMC5u8yCLbFDUPC1F8I95zx0n160HsRb+rdE7RgA99P/zxkgQp0yWOiod1urnCspHHm20nNXGu9e5yhsCcEoZF/A= 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=Y7Yn9n1A5U5x4tO9uhToUqSgTAdcmf7t3im+rqZjjfpgzeuNnI+gSZENy0ckNxVKtlHkULqHrvI7+7L8DM9kVvjE4jQiPCsyRmDn9e+lcOuq8OHDV8Z0QkkMkNegKNGv6VrCQnuON863zvOBz1hZUHFztus6pQtWgI5ApFF8v4g=; Message-ID: <582424.43815.qm@web28501.mail.ukl.yahoo.com> X-YMail-OSG: 6W8UEAwVM1mbQQsEk2DoTFF_BufE6vTbpstg19ERmqMIXdW CJdQo4C5M8HvA3tMywMhtXzLamEV0dSfoiaobA2m9DxYdEbCzH6t761zCFLy wf8Lb3aOE.8.L.69OPa4.Q7AQal29jdvumU5Y.bl_OVlEekCksL85r14O9vp ywKf5LV3H8bPGPSAIN5hHOecwfhvgFisntPlYyLflb.6siES1RMQtOOpynhv Dd3svYSBTzHhC0ZnjQfL28Uy7FzerV_CVIy5enXe1KGIyas1qkYcxTOOnA_4 - Received: from [81.97.191.183] by web28501.mail.ukl.yahoo.com via HTTP; Mon, 22 Nov 2010 18:45:30 GMT X-Mailer: YahooMailRC/504.5 YahooMailWebService/0.8.107.285259 References: <861077.53684.qm@web28512.mail.ukl.yahoo.com> <863803.39905.qm@web28510.mail.ukl.yahoo.com> <000901cb8a60$07eb0f50$0301a8c0@your91hoehfy9g> <256616.36903.qm@web28502.mail.ukl.yahoo.com> <001d01cb8a72$ffded6d0$0401a8c0@xphd97xgq27nyf> Date: Mon, 22 Nov 2010 18:45:30 +0000 (GMT) From: Chris Osborn To: rsgb_lf_group@blacksheep.org In-Reply-To: <001d01cb8a72$ffded6d0$0401a8c0@xphd97xgq27nyf> MIME-Version: 1.0 DomainKey-Status: good (testing) Subject: Re: LF: Re: VLF Transmissions Content-Type: multipart/alternative; boundary="0-1160621799-1290451530=:43815" 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_40_50,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-d292.1 ; domain : yahoo.co.uk DKIM : pass x-aol-sid: 3039ac1d608e4ceabaa93a0b X-AOL-IP: 195.171.43.25 --0-1160621799-1290451530=:43815 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hello Mal, My loading coil's wire is a bit fine. I started out using 0.35 mm diameter but ran out and my E-bay order for wi= re=20 didn't arrive in time. I finished off using 0.2 mm which was all I had in any quantity; it's quit= e=20 flimsy stuff. I guess the DL chap was using much heavier gauge wire, which I should have= done. I can actually get over 100 watts of RF into a dummy load and I may push= the=20 power up a little. The Met Office didn't detect my earlier 'effort' at all so I doubt I'll be= =20 causing them any QRM - HI ! A condition of the N.O.V. is that I sit by the telephone whilst transmitti= ng . .=20 .in case they tell me to QRT. I think that occurrence is highly improbable. 73 Chris=20 G3XIZ ________________________________ From: malhamilton To: rsgb_lf_group@blacksheep.org Sent: Mon, 22 November, 2010 18:28:03 Subject: Re: LF: Re: VLF Transmissions =EF=BB=BF =20 Chris The coil size seems reasonable for 1.3 mH ind. The DL man was talking abo= ut a=20 water butt 3ft wide and 4 ft high for a 300 ft kite, seems odd. What diam wire are u usinvg. Your pwr is on the low side for the freq to cover any distance. will look out for u but I cannot calibrate an accurate freq demal/g3kev =20 ----- Original Message -----=20 >From: Chris Osborn=20 >To: rsgb_lf_group@blacksheep.org=20 >Sent: Monday, November 22, 2010 5:12 PM >Subject: Re: LF: Re: VLF Transmissions > > >Hello Mal, > >I've wound an air-cored loading coil of about 1.3 H >It's on a wooden frame with hexagonal ends (all yacht varnished) and= has a=20 >mean diameter of 2 feet. >The winding length is 20 inches and it resonates my 40m inverted 'L'= at the=20 >correct frequency of 8.97 kHz > >I've made a VLF exciter which generates the drive frequency and interf= aces=20 >with the PC's software. >It uses a 2297 kHz crystal divided by 256 and gives a square wave outp= ut for=20 >the PA FET's. >I can run CW, QRSS or DFCW with 0.05 Hz shift. > >For the TX I've modified my existing 200 watt 500 kHz PA and for match= ing use=20 >an ex-UPS transformer. >The PA seems quite efficient into a 2000 - 3000 ohm resistive load. > >I have yet to be picked up beyond the boundary of my own garden so wou= ld be=20 >over the moon if anyone else can detect my signals. > >73 Chris=20 >G3XIZ > > > > > > > > ________________________________ From: malhamilton >To: rsgb_lf_group@blacksheep.org >Sent: Mon, 22 November, 2010 16:12:15 >Subject: LF: Re: VLF Transmissions > >=EF=BB=BF =20 >Chris >What are u using for a loading coil, amp etc >mal/g3kev >=20 >----- Original Message -----=20 >>From: Chris Osborn=20 >>To: LF Group=20 >>Sent: Monday, November 22, 2010 3:13 PM >>Subject: LF: VLF Transmissions >> >> >>LF, >> >>I have permission to transmit VLF this evening and details are as= =20 >follows:- >> >> >> >> ________________________________ =20 >> >> >>=20 >>DETAILS OF TESTS >> Loc: Biggleswade IO 92 UB =20 >>Time: Monday 22nd November 2010 20.00 - 22.00 GMT >>Freq: 8.9719 kHz >>Mode: QRSS - 10 second dot length / DFCW with 0.05 Hz shift /= CW=20 >>identifier at 5 wpm >>Power: Limited to 20 watts RF output (ERP unknown) >>Aer: 40m inverted 'L' at 10 m above ground. >> >> >>Any reports or comments are welcome.I >> >>Regards, >>=20 >>Chris=20 >> >>G3XIZ >> >> >> >> > =20 --0-1160621799-1290451530=:43815 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Hello Mal,

My loading coil's wire is a bit fine.
I sta= rted out using 0.35 mm diameter but ran out and my E-bay order for wire di= dn't arrive in time.
I finished off using 0.2 mm which was all I had in= any quantity; it's quite flimsy stuff.

I guess the DL chap was usi= ng much heavier gauge wire, which I should have done.

I can actuall= y get over 100 watts of RF into a dummy load and I may push the power up= a little.
The Met Office didn't detect my earlier 'effort' at all so= I doubt I'll be causing them any QRM - HI !

A condition of the N.O= .V. is that I sit by the telephone whilst transmitting . . .in case they= tell me to QRT.
I think that occurrence is highly improbable.

7= 3
Chris
G3XIZ



From: mal hamilton <g3kevmal@talktalk.net>
To: rsgb_lf_group@blacksheep.org
Sent: Mon, 22 November, 2010 18:2= 8:03
Subject: Re: LF:= Re: VLF Transmissions

=EF=BB=BF
Chris<= /font>
The coil size seems= reasonable for 1.3 mH ind. The DL man was talking about a water butt 3ft= wide and 4 ft high for a 300 ft kite, seems odd.
What diam wire are u usinvg.
= Your pwr is on the low side for the freq to cover any distance.
will look out for u but I cannot calibrate an accurate freq<= /div>
de mal/g3kev
=  
=
----- Original Message -----
= Sent: Monday, November 22, 2010 5:12= PM
Subject: Re: LF:= Re: VLF Transmissions

Hello Mal,

I'= ve wound an air-cored loading coil of about 1.3 H
It's on a wooden= frame with hexagonal ends (all yacht varnished) and has a mean diameter= of 2 feet.
The winding length is 20 inches and it resonates my 40m= inverted 'L' at the correct frequency of 8.97 kHz

I've made a= VLF exciter which generates the drive frequency and interfaces with th= e PC's software.
It uses a 2297 kHz crystal divided by 256 and gives= a square wave output for the PA FET's.
I can run CW, QRSS or DFCW= with 0.05 Hz shift.

For the TX I've modified my existing 200 wa= tt 500 kHz PA and for matching use an ex-UPS transformer.
The PA see= ms quite efficient into a 2000 - 3000 ohm resistive load.

I have= yet to be picked up beyond the boundary of my own garden=20 so would be over the moon if anyone else can detect my signals.

= 73 Chris
G3XIZ




From: mal hamilton <g3kevmal@talktalk.net>= ;
To: rsgb_lf_group= @blacksheep.org
Sent:= Mon, 22 November, 2010 16:12:15
Subject: LF: Re: VLF Transmissions

=EF=BB= =BF
Chris
What are u using for a loading coil, amp etc
=
mal/g3kev
&nb= sp;
=
----- Original Message -----=
Sent: Monday, November 22, 2010 3:13= PM
Subject: LF:= VLF Transmissions

=
LF,

I have permission to transmit VLF this evening and= details are as follows:-


=

&= nbsp;
DETAILS OF TESTS
 
Loc:=          Biggleswade &nb= sp; IO 92 UB 
Time:      &nbs= p;Monday 22nd November 2010   20.00 - 22.00 = GMT
Freq:        8.9719= kHz
Mode:      QRSS - 10 second= dot length / DFCW with 0.05 Hz shift / CW identifier at 5 wpm
Power:     Limited to 20 watts RF= output (ERP unknown)
Aer:    &nbs= p;    40m inverted 'L' at 10 m above ground.

Any reports or comments are welcome.I

Regards,
 
Chris
G3XIZ






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