Return-Path: Received: from mtain-ma11.r1000.mx.aol.com (mtain-ma11.r1000.mx.aol.com [172.29.96.19]) by air-mb01.mail.aol.com (v129.4) with ESMTP id MAILINMB011-a0764cab48047a; Tue, 05 Oct 2010 11:45:08 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-ma11.r1000.mx.aol.com (Internet Inbound) with ESMTP id AB797380000FE; Tue, 5 Oct 2010 11:45:06 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1P39fv-0006HC-8Q for rs_out_1@blacksheep.org; Tue, 05 Oct 2010 16:43:31 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1P39fu-0006H3-Kg for rsgb_lf_group@blacksheep.org; Tue, 05 Oct 2010 16:43:30 +0100 Received: from mail-qy0-f178.google.com ([209.85.216.178]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1P39fr-0007tO-T3 for rsgb_lf_group@blacksheep.org; Tue, 05 Oct 2010 16:43:30 +0100 Received: by qyk2 with SMTP id 2so756077qyk.16 for ; Tue, 05 Oct 2010 08:43:20 -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=4VjzlQpxwOjyPYAOWrLbKvQ+laJCLX//HsJmkLQBIIM=; b=qaEaIFfDr7Ub6lvKJyqVa2PNB9cXW2Iw0N1blWs8Vj2MdzayE3Hj5xmY9uute6Exk4 rgKShu48hI5JxGsjohSYuEPICPKM/duJwbSI1Hm9QedJe3idlkjaMYdIts3xn3mgTa4f y5yZcYDg9zJEVQe4odyfCMnCCfW4gir3EKeow= 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=ok1jDMIM2A+Vsa3sm+6GAEsqd11fKoum8PFAKoMB5R62bnnsINv3lwPPoL50NM7ybT e7Dp0Qd0pWLPkES+2Ub6zbIpszf0Bm5FAup4bWMexcgVw/NwaBs/qMYSrccg4fHOJfkB 83Ydvqs2YJWKqmNkY3rWsiYoZMyCqRDFYd/4I= MIME-Version: 1.0 Received: by 10.224.19.147 with SMTP id a19mr8370525qab.126.1286293400495; Tue, 05 Oct 2010 08:43:20 -0700 (PDT) Received: by 10.229.217.77 with HTTP; Tue, 5 Oct 2010 08:43:19 -0700 (PDT) In-Reply-To: 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 11:43:19 -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=0015175cb4a436a9860491e08580 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-d264.2 ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d60134cab48024190 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --0015175cb4a436a9860491e08580 Content-Type: text/plain; charset=ISO-8859-1 Hello Daniele, Also please see LF Engineering: http://www.lfengineering.com/ -- 73 Warren K2ORS WD2XGJ WD2XSH/23 WE2XEB/2 WE2XGR/1 On Tue, Oct 5, 2010 at 11:17 AM, Warren Ziegler wrote: > 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 >>> >>> >> >> >> >> > > > --0015175cb4a436a9860491e08580 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hello Daniele,

=A0=A0 Also please see LF Engineering:
http://www.lfengineering.com/

<= br>

--
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




On Tue, Oct 5,= 2010 at 11:17 AM, Warren Ziegler <wd2xgj@gmail.com> wrote:
Hello Daniele,<= br>
=A0=A0 A couple of possibilities for a quick and easy whistler rece= iver:
1) The McGreevy W3 available already built in a case or as a circuit board= :=A0=A0 http://www.auroralchorus.com/wr3gx2.htm

2) The North Country Earth Receiver:=A0=A0 http://www.northc= ountryradio.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 th= e=A0 moment but perhaps 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 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 11:00 AM, Dani= ele 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











=A0
--0015175cb4a436a9860491e08580--