Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mb03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 0D03D380000A4; Sun, 2 Dec 2012 16:54:22 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TfHTo-0004Rh-57 for rs_out_1@blacksheep.org; Sun, 02 Dec 2012 21:53:40 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TfHTn-0004RX-KE for rsgb_lf_group@blacksheep.org; Sun, 02 Dec 2012 21:53:39 +0000 Received: from rhcavuit02.kulnet.kuleuven.be ([134.58.240.130] helo=cavuit02.kulnet.kuleuven.be) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1TfHTl-000637-Gp for rsgb_lf_group@blacksheep.org; Sun, 02 Dec 2012 21:53:38 +0000 X-KULeuven-Envelope-From: rik.strobbe@fys.kuleuven.be X-KULeuven-Scanned: Found to be clean X-KULeuven-ID: 20EF612802B.A2404 X-KULeuven-Information: Katholieke Universiteit Leuven Received: from icts-p-smtps-2.cc.kuleuven.be (icts-p-smtps-2e.kulnet.kuleuven.be [134.58.240.34]) by cavuit02.kulnet.kuleuven.be (Postfix) with ESMTP id 20EF612802B for ; Sun, 2 Dec 2012 22:53:14 +0100 (CET) Received: from ICTS-S-HUB3.luna.kuleuven.be (icts-s-hub3.luna.kuleuven.be [10.112.9.17]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by icts-p-smtps-2.cc.kuleuven.be (Postfix) with ESMTPS id 252F120041 for ; Sun, 2 Dec 2012 22:53:14 +0100 (CET) Received: from ICTS-S-MBX5.luna.kuleuven.be ([fe80::312b:f3bc:9c4:4ebb]) by ICTS-S-HUB3.luna.kuleuven.be ([fe80::a470:76b3:406d:2b1a%27]) with mapi id 14.02.0309.002; Sun, 2 Dec 2012 22:53:13 +0100 X-Kuleuven: This mail passed the K.U.Leuven mailcluster From: Rik Strobbe To: "rsgb_lf_group@blacksheep.org" Thread-Topic: Problem with generator to VLF transmitter Thread-Index: AQHN0M5Lw2N72O8sjUyyvQZHA6iNM5gGCCNw Date: Sun, 2 Dec 2012 21:53:12 +0000 Message-ID: <7E7DFBB4D102A04DB5ADC88D66628A4A0FB5C20D@ICTS-S-MBX5.luna.kuleuven.be> References: <003f01cdd0cd$7ba8de30$6600a8c0@dupaod6d2sep9z> In-Reply-To: <003f01cdd0cd$7ba8de30$6600a8c0@dupaod6d2sep9z> Accept-Language: nl-BE, en-US Content-Language: nl-BE X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.112.13.14] MIME-Version: 1.0 X-HELO-Warning: Remote host 134.58.240.130 (rhcavuit02.kulnet.kuleuven.be) used invalid HELO/EHLO cavuit02.kulnet.kuleuven.be - verification failed X-Spam-Score: -0.7 (/) 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: Hello Marcin, generating 2 counterphase sine signals can be easily done with a soundcard. But as you are speaking of duty cycles I assume that you want a square wave signal and there you are limited by the sample rate of the soundcard. These days 192kHz soundcards are easily available, was means a sample each 5.20833.. microseconds. [...] Content analysis details: (-0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [134.58.240.130 listed in list.dnswl.org] -0.0 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: e51657317b06d9cbe905ec682fad6602 Subject: LF: RE: Problem with generator to VLF transmitter Content-Type: multipart/alternative; boundary="_000_7E7DFBB4D102A04DB5ADC88D66628A4A0FB5C20DICTSSMBX5lunaku_" 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, 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-sid: 3039ac1d601750bbce0e48b4 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --_000_7E7DFBB4D102A04DB5ADC88D66628A4A0FB5C20DICTSSMBX5lunaku_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Hello Marcin, generating 2 counterphase sine signals can be easily done with a soundcard. But as you are speaking of duty cycles I assume that you want a square wave= signal and there you are limited by the sample rate of the soundcard. Thes= e days 192kHz soundcards are easily available, was means a sample each 5.20= 833.. microseconds. For 8970Hz the closest frequency is 8727.2727.. Hz (192000/22). If you want to use a soundcard your best option may be to generate sine sig= nals and use a hardware discriminator to convert them to a square wave. If I am not mistaken you could use DL4YHF's Spectrum Lab software as it has= a test generator option. 73, Rik ON7YD - OR7T ________________________________ Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org= ] namens Marcin [bxi@go2.pl] Verzonden: zondag 2 december 2012 21:42 To: rsgb_lf_group@blacksheep.org Onderwerp: LF: Problem with generator to VLF transmitter Hi All! We=92re building an 8,970kHz VLF transmitter at SP2KDS club. We almost have everything in place: * transmitter (on IGBT transistors =96 diagram attached) * antenna coil 76mH http://www.sp2kds.pl/136khz/303-klubowa-cewka-vlf-n= a-897khz * 4 capacitors 4nF/30kV * 100m long, 20m high antenna * supply 60V 50 A What we still need is a generator to feed the transmitter. Required paramet= ers are the following: * 8,970kHz frequency * regulating range +-0.05Hz * adjusting duty cycle of 5 to 45%, at 5% for two signals at the same t= ime * two signals shifted by 180 degrees A friend of mine has promised to build it but it=92s been over a year now a= nd nothing has happened. Is there a software which would use a soundcard with the aforementioned par= ameters? 73! Marcin SQ2BXI --_000_7E7DFBB4D102A04DB5ADC88D66628A4A0FB5C20DICTSSMBX5lunaku_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable

Hello Marcin= ,

 

generating 2 c= ounterphase sine signals can&nbs= p;be easily done with a soundcar= d.

But as you<= /a> are speaking of duty cycles I = assume that you want a square wave sign= al and there you are limited&nbs= p;by the sample rate of the soundcard. These days 192kHz so= undcards are easily available, was mean= s a sample each 5.20833.. microseconds.

For 8970Hz the closest fre= quency is 8727.2727.. Hz (192000/22).

If you want = to use a soundcard your best optio= n may be to generate sine signals and use a hardware discriminator= to convert them to a square wave. 

If I am=  not mistaken you could use=  DL4YHF's Spectrum Lab software as it has a test ge= nerator option.

 

73, Rik  ON7YD - OR7T

 

 

 

Van: owner-rsgb_lf_group@blacksheep.org [ow= ner-rsgb_lf_group@blacksheep.org] namens Marcin [bxi@go2.pl]
Verzonden: zondag 2 december 2012 21:42
To: rsgb_lf_group@blacksheep.org
Onderwerp: LF: Problem with generator to VLF transmitter

Hi All!
We=92re building an 8,970kHz VLF transmitter at SP2KDS club.
We almost have everything in place:
 
What we still need is a generator to feed the transmitter. Required pa= rameters are the following:
  • 8,970kHz frequency
  • regulating range +-0.05Hz
    • adjusting duty cycle of 5 to 45%, at 5% fo= r two signals at the same time
  • two signals shifted by 180 degrees=
A friend of mine has promised to build it but it=92s been over a year = now and nothing has happened.
Is there a software which would use a soundcard with the aforementione= d parameters?
 
73! Marcin SQ2BXI
--_000_7E7DFBB4D102A04DB5ADC88D66628A4A0FB5C20DICTSSMBX5lunaku_--