Return-Path: Received: from mtain-mi07.r1000.mx.aol.com (mtain-mi07.r1000.mail.aol.com [172.21.131.165]) by air-db04.mail.aol.com (v129.4) with ESMTP id MAILINDB041-85f04ceab6b7ff; Mon, 22 Nov 2010 13:30:15 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mi07.r1000.mx.aol.com (Internet Inbound) with ESMTP id C01B838000114; Mon, 22 Nov 2010 13:30:13 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PKb7i-0001Lf-Ay for rs_out_1@blacksheep.org; Mon, 22 Nov 2010 18:28:18 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PKb7h-0001LW-QJ for rsgb_lf_group@blacksheep.org; Mon, 22 Nov 2010 18:28:17 +0000 Received: from out1.ip03ir2.opaltelecom.net ([62.24.128.239]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PKb7e-00069J-Ri for rsgb_lf_group@blacksheep.org; Mon, 22 Nov 2010 18:28:17 +0000 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AjsDAA9F6kxcB92a/2dsb2JhbACCAIFKjReDOY5Gcqx1kQuEWHMEgVyOfw X-IronPort-AV: E=Sophos;i="4.59,237,1288569600"; d="scan'208,217";a="327227687" Received: from host-92-7-221-154.as43234.net (HELO xphd97xgq27nyf) ([92.7.221.154]) by out1.ip03ir2.opaltelecom.net with SMTP; 22 Nov 2010 18:28:08 +0000 Message-ID: <001d01cb8a72$ffded6d0$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: 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> Date: Mon, 22 Nov 2010 18:28:03 -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: Re: VLF Transmissions Content-Type: multipart/alternative; boundary="----=_NextPart_000_001A_01CB8A72.FFBB2230" 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-sid: 3039400cdecf4ceab6b54fca X-AOL-IP: 195.171.43.25 ------=_NextPart_000_001A_01CB8A72.FFBB2230 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Chris 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 od= d. 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 de mal/g3kev ----- 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 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 inte= rfaces with the PC's software. It uses a 2297 kHz crystal divided by 256 and gives a square wave ou= tput 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 watt 500 kHz PA and for mat= ching use 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= would be over the moon if anyone else can detect my signals. 73 Chris=20 G3XIZ ----------------------------------------------------------------------= -------- From: mal hamilton 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 ----- 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= follows:- ----------------------------------------------------------------------= ------ 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 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, Chris=20 G3XIZ ------=_NextPart_000_001A_01CB8A72.FFBB2230 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable
Chris
The coil size seems reasonable= for 1.3 mH ind.=20 The DL man was talking about a water butt 3ft wide and 4 ft high for= a 300 ft=20 kite, seems odd.
What diam wire are u usinvg.
Your pwr is on the low side for the= freq to cover=20 any distance.
will look out for u but I cannot cali= brate an=20 accurate freq
de mal/g3kev
 
----- Original Message -----
From:=20 Chris= Osborn=20
Sent: Monday, November 22, 20= 10 5:12=20 PM
Subject: Re: LF: Re: VLF=20 Transmissions

Hello=20 Mal,

I've wound an air-cored loading coil of about 1.3 H
I= t's on a=20 wooden frame with hexagonal ends (all yacht varnished) and has a mea= n diameter=20 of 2 feet.
The winding length is 20 inches and it resonates my 40= m inverted=20 'L' at the correct frequency of 8.97 kHz

I've made a VLF exci= ter which=20 generates the drive frequency and interfaces with the PC's software.=
It=20 uses a 2297 kHz crystal divided by 256 and gives a square wave outpu= t for the=20 PA FET's.
I can run CW, QRSS or DFCW with 0.05 Hz shift.

F= or the TX=20 I've modified my existing 200 watt 500 kHz PA and for matching use= an ex-UPS=20 transformer.
The PA seems quite efficient into a 2000 - 3000 ohm= resistive=20 load.

I have yet to be picked up beyond the boundary of my ow= n garden=20 so would be over the moon if anyone else can detect my signals.
<= BR>73=20 Chris
G3XIZ




From: mal hamilton= =20 <g3kevmal@talktalk.net>
To:=20 rsgb_lf_group@blacksheep.org
Sent: Mon, 22 November, 2010=20 16:12:15
Subject:= LF: Re: VLF=20 Transmissions

=EF=BB=BF=20
Chris
What are u using for a loading coil= , amp=20 etc
mal/g3kev
 
-----=20 Original Message -----
From:=20 Chris Osborn
To:=20 LF Group
Sent:=20 Monday, November 22, 2010 3:13 PM
Subject:=20 LF: VLF Transmissions

LF,

I have permission to transmit VLF this even= ing and details=20 are as follows:-



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


Any reports or comments are=20 welcome.I

Regards,
 
Chris
G3XIZ


=


------=_NextPart_000_001A_01CB8A72.FFBB2230--