Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-db05.r1000.mx.aol.com (Internet Inbound) with ESMTP id E9BD7380000B2; Sun, 2 Dec 2012 16:07:04 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TfGjo-0003y5-Rz for rs_out_1@blacksheep.org; Sun, 02 Dec 2012 21:06:08 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TfGjo-0003xw-6y for rsgb_lf_group@blacksheep.org; Sun, 02 Dec 2012 21:06:08 +0000 Received: from smtpout4.wanadoo.co.uk ([80.12.242.68] helo=smtpout.wanadoo.co.uk) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1TfGjm-0005rl-6v for rsgb_lf_group@blacksheep.org; Sun, 02 Dec 2012 21:06:07 +0000 Received: from AGB ([2.26.46.237]) by mwinf5d54 with ME id Wl5k1k00H572KJS03l5k9f; Sun, 02 Dec 2012 22:05:45 +0100 Message-ID: <9EDEBD56B5124EB781CD265718D5D4FA@AGB> From: "Graham" To: References: <003f01cdd0cd$7ba8de30$6600a8c0@dupaod6d2sep9z> In-Reply-To: <003f01cdd0cd$7ba8de30$6600a8c0@dupaod6d2sep9z> Date: Sun, 2 Dec 2012 21:05:44 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MIMEOLE: Produced By Microsoft MimeOLE V14.0.8117.416 X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: a.. two signals shifted by 180 degrees...Is this in time ? or amplitude ? [if amp then invert ?] change to duty cycle ? square wave drive ? would this be better in hardware , then any signal could be used to drive ? [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [80.12.242.68 listed in list.dnswl.org] 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: e6360f34ef88d0e1db765f70efb2bfe9 Subject: Re: LF: Problem with generator to VLF transmitter Content-Type: multipart/alternative; boundary="----=_NextPart_000_01C0_01CDD0D0.CB229A70" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_40_50,HTML_MESSAGE, MISSING_OUTLOOK_NAME 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: 3039ac1d405950bbc2f80a26 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. ------=_NextPart_000_01C0_01CDD0D0.CB229A70 Content-Type: text/plain; charset="iso-8859-2" Content-Transfer-Encoding: quoted-printable a.. two signals shifted by 180 degrees...Is this in time ? or = amplitude ? [if amp then invert ?]=20 change to duty cycle ? square wave drive ?=20 would this be better in hardware , then any signal could be used = to drive ? G.. From: Marcin=20 Sent: Sunday, December 02, 2012 8:42 PM To: rsgb_lf_group@blacksheep.org=20 Subject: LF: Problem with generator to VLF transmitter Hi All! We're building an 8,970kHz VLF transmitter at SP2KDS club. We almost have everything in place: a.. transmitter (on IGBT transistors - diagram attached)=20 b.. antenna coil 76mH = http://www.sp2kds.pl/136khz/303-klubowa-cewka-vlf-na-897khz=20 c.. 4 capacitors 4nF/30kV=20 d.. 100m long, 20m high antenna=20 e.. supply 60V 50 A What we still need is a generator to feed the transmitter. Required = parameters are the following: a.. 8,970kHz frequency=20 b.. regulating range +-0.05Hz=20 c.. adjusting duty cycle of 5 to 45%, at 5% for two signals at the = same time=20 d.. two signals shifted by 180 degrees A friend of mine has promised to build it but it's been over a year now = and nothing has happened. Is there a software which would use a soundcard with the aforementioned = parameters? 73! Marcin SQ2BXI ------=_NextPart_000_01C0_01CDD0D0.CB229A70 Content-Type: text/html; charset="iso-8859-2" Content-Transfer-Encoding: quoted-printable
 
  • two signals shifted by 180 = degrees...Is this  in time  ? or  amplitude  = ? [if =20 amp  then  invert ?]
    •  
    change to  duty cycle ? square wave  = drive  ?=20
     
    would this  be  better in hardware  , = then  any  signal  could  be  used to  = drive =20 ?
     
    G..
     
     
     

    From: Marcin
    Sent: Sunday, December 02, 2012 8:42 PM
    To: rsgb_lf_group@blacksheep.org= =20
    Subject: LF: Problem with generator to VLF=20 transmitter

    Hi All!
    We’re building an 8,970kHz VLF transmitter at SP2KDS = club.
    We almost have everything in place:
    • transmitter (on IGBT transistors – diagram attached)=20
    • antenna coil 76mH http= ://www.sp2kds.pl/136khz/303-klubowa-cewka-vlf-na-897khz=20
    • 4 capacitors 4nF/30kV=20
    • 100m long, 20m high antenna=20
    • supply 60V 50 A
     
    What we still need is a generator to feed the transmitter. Required = parameters are the following:
    • 8,970kHz frequency=20
    • regulating range +-0.05Hz=20
    • adjusting duty cycle of 5 to 45%, at = 5% for two=20 signals at the same time=20
    • two signals shifted by 180 = degrees
    A friend of mine has promised to build it but it’s been over = a year now and=20 nothing has happened.
    Is there a software which would use a soundcard with the = aforementioned=20 parameters?
     
    73! Marcin = SQ2BXI
    ------=_NextPart_000_01C0_01CDD0D0.CB229A70--