Return-Path: Received: from mtain-mh12.r1000.mx.aol.com (mtain-mh12.r1000.mx.aol.com [172.29.96.224]) by air-mb07.mail.aol.com (v129.4) with ESMTP id MAILINMB072-a7854cab446931b; Tue, 05 Oct 2010 11:29:45 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mh12.r1000.mx.aol.com (Internet Inbound) with ESMTP id C9284380069F8; Tue, 5 Oct 2010 11:19:53 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1P39HM-00068O-Iu for rs_out_1@blacksheep.org; Tue, 05 Oct 2010 16:18:08 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1P39HL-00068F-T2 for rsgb_lf_group@blacksheep.org; Tue, 05 Oct 2010 16:18:07 +0100 Received: from mail-yw0-f43.google.com ([209.85.213.43]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1P39HI-0007ee-Ce for rsgb_lf_group@blacksheep.org; Tue, 05 Oct 2010 16:18:07 +0100 Received: by ywa8 with SMTP id 8so274016ywa.16 for ; Tue, 05 Oct 2010 08:17:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type; bh=pYfk9gpfyV7wqeijG5kCWUEazFUEizL4XBdhUeM0370=; b=NNtd0yk1ptImwy0Pab693WLIZtfbcyRtb2UqpUzCGNZtAmJxos8mWs+j66dgPtnyai Cry65U4ZxD7HOVICFC0N6htXJjg+IlTN2/eaLl2pSP4oY4+Q1nxMmlD7qPo9xmvcc/F4 hWAvSJ28nr8d4b3HgM+zOTwFpLQoqYY+YdsAQ= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=qpED2yYJ2Dr/d6nJKVGtmMj26rQ8N79oXPqxywTgZPUIwb7gaFviCfzBi8s+l5bdcH g5Dm4j7DPyvj6fK9ckwl9JNGjHmY+4T+60PHqz2yvlAze/4l9AygYpjL988ZRqPJo9rs llU5FUROJqstFtlYT7GAp54g5QVeOVmLaZYIU= MIME-Version: 1.0 Received: by 10.100.168.4 with SMTP id q4mr814513ane.255.1286291873629; Tue, 05 Oct 2010 08:17:53 -0700 (PDT) Received: by 10.229.217.77 with HTTP; Tue, 5 Oct 2010 08:17:52 -0700 (PDT) In-Reply-To: <26222.79702.qm@web111904.mail.gq1.yahoo.com> References: <4CA9BDE0.4000601@iup.uni-heidelberg.de> <646839.20132.qm@web111910.mail.gq1.yahoo.com> <4CAA4521.6070301@iup.uni-heidelberg.de> <242345.444.qm@web111918.mail.gq1.yahoo.com> <26222.79702.qm@web111904.mail.gq1.yahoo.com> Date: Tue, 5 Oct 2010 11:17:52 -0400 Message-ID: From: Warren Ziegler To: rsgb_lf_group@blacksheep.org DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: VLF: Inspire VLF-3 receiver Content-Type: multipart/alternative; boundary=001485f647463628250491e02ac2 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_20_30, HTML_FONTCOLOR_UNSAFE,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-d256.2 ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d60e04cab4219701d X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --001485f647463628250491e02ac2 Content-Type: text/plain; charset=ISO-8859-1 Hello Daniele, A couple of possibilities for a quick and easy whistler receiver: 1) The McGreevy W3 available already built in a case or as a circuit board: http://www.auroralchorus.com/wr3gx2.htm 2) The North Country Earth Receiver: http://www.northcountryradio.com/Kitpages/elfrcvr.htm 3) Ten-Tec used to make a high gain audio amplifier kit, I don't see it on their web page at the moment but perhaps you can find one? Personally I have the North Country receiver, it works fine but I can't get to quiet locations all that often, my best results have been at the seaside away from power lines. -- 73 Warren K2ORS WD2XGJ WD2XSH/23 WE2XEB/2 WE2XGR/1 On Tue, Oct 5, 2010 at 11:00 AM, Daniele Tincani wrote: > Hello Warren, > > yes, I see. However, I did not intend to use the VLF-3 for sub-9KHz ham > radio listening, rather I'm looking for a VLF reception solution that I > could possibly move away from domestic noise and take with me for a walk in > the countryside. > My reasoning is: I'm pretty sure :-) that I have hum at home affecting > reception below 10KHz. I will try a small passive HPF just to see if it > improves things a bit, but I'm not confident about this attempt, given that > probably the noise is not generated by saturation in the pre-amp or the > soundcard. Of course the pre-amp and the soundcard have their own noise > floor, but it seems to me that external noise is well above it. Given this > situation, I think that no home-based receiver could really remove the > problem at my current location. > On the other hand, I live in a jointly-owned building, at 5th floor, so it > would be not "politically" easy to install a long coax cable across the > property and up to my balcony :-). More complex solutions like > remotely-interfaced antennas, etc. are out of my budget for VLF at present > (in terms of spare time for study, setup, etc. :-)). > In summary, while trying to improve my current loop and pre-amp, I think > that building an E-probe could add a bit to my current experience with VLF > "antennas" and could probably result in a more handy solution for > "in-the-field" listening sessions. > I'm interested in a portable VLF receiver (more general-purpose than VLF-3, > if possible). Ready-to-mount kits are preferable because of the short > free-time I have for homebrewing. Please suggest any suitable solution that > you could have information on. > > Cheers > D. > > ------------------------------ > *From:* Warren Ziegler > *To:* rsgb_lf_group@blacksheep.org > *Sent:* Tue, October 5, 2010 4:09:01 PM > *Subject:* Re: VLF: Inspire VLF-3 receiver > > Daniele, > The Inspire kit is a broadband high gain audio amplifier with a very > high input impedance - generically its a 'whistler receiver'. > Whistler receivers like Inspire are good for listening to whistlers, > tweeks, dawn chorus etc but it would be completely useless for listening to > amateur VLF experiments - its broadband, has no 'bfo' to detect a carrier > and would be difficult to interface to a sound card. > > > -- > 73 Warren K2ORS > WD2XGJ > WD2XSH/23 > WE2XEB/2 > WE2XGR/1 > > > > On Tue, Oct 5, 2010 at 4:43 AM, Daniele Tincani wrote: > >> Hi VLF, >> >> any opinions about the Inspire VLF-3 receiver kit? >> http://theinspireproject.org/uploads/PDF/Theory_of_Operations.pdf >> Thank you in advance for your feedbacks. >> >> Regards >> Daniele >> >> > > > > --001485f647463628250491e02ac2 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hello Daniele,

=A0=A0 A couple of possibilities for a quick and eas= y whistler receiver:
1) The McGreevy W3 available already built in a ca= se or as a circuit board:=A0=A0 http://www.auroralchorus.com/wr3gx2.htm

2) The North Country Earth Receiver:=A0=A0 http://www.northcountryradio.com/Ki= tpages/elfrcvr.htm

3) Ten-Tec used to make a high gain audio am= plifier kit, I don't see it on their web page at the=A0 moment but per= haps you can find one?


=A0=A0=A0=A0 Personally I have the North Country receiver, it work= s fine but I can't get to quiet locations all that often, my best resu= lts have been at the seaside away from power lines.
--
73 Warren K2= ORS
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 WD2XGJ
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= WD2XSH/23
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 WE2XEB/2
=A0 =A0 =A0 =A0= =A0 =A0 =A0 =A0 WE2XGR/1

=A0

On= Tue, Oct 5, 2010 at 11:00 AM, Daniele Tincani <danieletincani@yahoo.com> wrote:
Hello= Warren,
=A0
yes, I see. However, I did=A0not intend to=A0use the=A0VLF-3 for=A0su= b-9KHz ham radio listening, rather I'm looking for=A0a VLF=A0reception= solution=A0that I could possibly move away from domestic noise and take= with me for a walk in the countryside.
My reasoning is: I'm pretty sure :-) that I have hum at home affe= cting reception below 10KHz. I will try a small passive HPF just to see if= it improves things a bit, but I'm not confident about this attempt,= given that probably the noise is not generated by saturation in the pre-a= mp or the soundcard. Of course the pre-amp and the soundcard have=A0their= own noise floor, but it seems to me that external noise is well above it.= Given this situation, I think that no home-based receiver could really re= move the problem at my current location.
On the other hand,=A0I live in a jointly-owned building, at 5th floor= , so it would be not "politically" easy to install a long coax= cable across the property and up to my balcony :-). More complex solution= s like remotely-interfaced antennas, etc. are out of my budget for VLF at= present (in terms of spare time for study, setup, etc.=A0:-)).
In summary, while trying to improve my current loop and pre-amp,=A0I= think that building an E-probe could add a bit to my current experience= with VLF "antennas" and could probably result in a more handy= solution for "in-the-field" listening sessions.
I'm interested in a portable VLF receiver (more general-purpose= than VLF-3, if possible). Ready-to-mount kits are preferable because of= the=A0short free-time I have for homebrewing. Please suggest any suitable= solution that you could have information on.
=A0
Cheers
D.
<= br>
From: Warren Ziegler <= wd2xgj@gmail.com= >
To: rsgb_lf_group@blacksh= eep.org
Sent: Tue, October 5, 201= 0 4:09:01 PM
Subject:= Re: VLF: Inspire VLF-3 receiver

Daniele,
=A0=A0 The Inspire kit is a broadband high gain audio amplifie= r with a very high input impedance - generically its a 'whistler recei= ver'.
Whistler receivers like Inspire are good for listening to whi= stlers, tweeks, dawn chorus etc but it would be completely useless for lis= tening to amateur VLF experiments - its broadband, has no 'bfo' to= detect a carrier and would be difficult to interface to a sound card.


--
73 Warren K2ORS
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 WD2XGJ=
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 WD2XSH/23
=A0 =A0 =A0 =A0 =A0 =A0= =A0 =A0 WE2XEB/2
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 WE2XGR/1

=A0
On Tue, Oct 5, 2010 at 4:43 AM, Daniele Tincani= <danieletincani@yahoo.com> wrote:=
Hi VLF,
=A0
any opinions about the Inspire VLF-3 receiver kit?
Thank you in advance for your feedbacks.
=A0
Regards
Daniele








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