Return-Path: Received: from mtain-mj11.r1000.mx.aol.com (mtain-mj11.r1000.mail.aol.com [172.21.164.95]) by air-df01.mail.aol.com (v129.4) with ESMTP id MAILINDF014-5ee54caba1b725; Tue, 05 Oct 2010 18:07:51 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mj11.r1000.mx.aol.com (Internet Inbound) with ESMTP id DC48138000085; Tue, 5 Oct 2010 18:07:48 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1P3FeO-0000Oj-76 for rs_out_1@blacksheep.org; Tue, 05 Oct 2010 23:06:20 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1P3FeN-0000Oa-Dj for rsgb_lf_group@blacksheep.org; Tue, 05 Oct 2010 23:06:19 +0100 Received: from blu0-omc1-s4.blu0.hotmail.com ([65.55.116.15]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1P3FeK-0002E4-W0 for rsgb_lf_group@blacksheep.org; Tue, 05 Oct 2010 23:06:19 +0100 Received: from BLU146-W28 ([65.55.116.8]) by blu0-omc1-s4.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Tue, 5 Oct 2010 15:06:09 -0700 Message-ID: X-Originating-IP: [138.32.32.166] From: Laurence KL7UK To: Date: Tue, 5 Oct 2010 14:06:08 -0800 Importance: Normal 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>,, MIME-Version: 1.0 X-OriginalArrivalTime: 05 Oct 2010 22:06:09.0039 (UTC) FILETIME=[83B291F0:01CB64D9] X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Content-Type: multipart/alternative; boundary="_5f03f2ee-099b-4bdd-9896-dd1c4e0017ae_" Subject: RE: VLF: Inspire VLF-3 receiver 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=FORGED_HOTMAIL_RCVD,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-sid: 3039400c89b64caba1b47b78 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --_5f03f2ee-099b-4bdd-9896-dd1c4e0017ae_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Im using the LF Engineering L400B for VLF in Alaska, which Ive owned and= dragged around for the past ten years or so; its (>600kHz) filtering befo= re the first 2N device has stopped all the mixing products (8, 20,30,40,= 50, 60 Khz) from 500-600Khz bcst I had with the PA0RDT -=20 =20 I am pushing the limit on mixing products as nearby Alaska has a few 10Kw= Blowtorches and its unfair treatment for an unfiltered input device (save= that dang resistor!); I use the PAORDT here in Oklahoma and no issues wit= h unwanted products. =20 Laurence KL7 UK KL7 UK/5 =20 Date: Tue, 5 Oct 2010 11:43:19 -0400 From: wd2xgj@gmail.com To: rsgb_lf_group@blacksheep.org Subject: Re: VLF: Inspire VLF-3 receiver Hello Daniele, Also please see LF Engineering: http://www.lfengineering.com/ --=20 73 Warren K2ORS WD2XGJ=20 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/Ki= tpages/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. --=20 73 Warren K2ORS WD2XGJ=20 WD2XSH/23 WE2XEB/2 WE2XGR/1 =20 On Tue, Oct 5, 2010 at 11:00 AM, Daniele Tincani wrote: Hello Warren,=20 =20 yes, I see. However, I did not intend to use the VLF-3 for sub-9KHz ham ra= dio listening, rather I'm looking for a VLF reception solution that I coul= d possibly move away from domestic noise and take with me for a walk in th= e countryside. My reasoning is: I'm pretty sure :-) that I have hum at home affecting rec= eption below 10KHz. I will try a small passive HPF just to see if it impro= ves things a bit, but I'm not confident about this attempt, given that pro= bably the noise is not generated by saturation in the pre-amp or the sound= card. 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 situa= tion, 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-i= nterfaced 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 VL= F "antennas" and could probably result in a more handy solution for "in-th= e-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 fr= ee-time I have for homebrewing. Please suggest any suitable solution that= you could have information on. =20 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 hi= gh input impedance - generically its a 'whistler receiver'. Whistler receivers like Inspire are good for listening to whistlers, tweek= s, dawn chorus etc but it would be completely useless for listening to ama= teur VLF experiments - its broadband, has no 'bfo' to detect a carrier and= would be difficult to interface to a sound card. --=20 73 Warren K2ORS WD2XGJ=20 WD2XSH/23 WE2XEB/2 WE2XGR/1 =20 On Tue, Oct 5, 2010 at 4:43 AM, Daniele Tincani = wrote: Hi VLF, =20 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. =20 Regards Daniele =20 =3D --_5f03f2ee-099b-4bdd-9896-dd1c4e0017ae_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Im using the LF Engineering L400B for VLF in Alaska, which Ive owned and= dragged around for the past ten years or so; its (>600kHz) filtering= before the first 2N device has stopped all the mixing products (8,= 20,30,40, 50, 60 Khz) from 500-600Khz bcst  I had with the PA0R= DT -
 
I am pushing the limit on mixing products as nearby Alaska has a few 10Kw= Blowtorches and its unfair treatment for an unfiltered input device (save= that dang resistor!); I use the PAORDT here in Oklahoma and no issues wit= h unwanted products.
 
Laurence KL7 UK KL7 UK/5
 
Date: Tue, 5 Oct 2010 11:43:19 -0400
From: wd2xgj@gmail.com
To: rsgb= _lf_group@blacksheep.org
Subject: Re: VLF: Inspire VLF-3 receiver
Hello Daniele,

   Also please see LF Engineering:
http://www.lfengin= eering.com/




--
73 Warren K2ORS
&= nbsp;               WD2XGJ
 =               WD2XSH/23
  &nbs= p;             WE2XEB/2
    &nb= sp;           WE2XGR/1




On Tue, Oct 5, 2010 at 11:17 AM, Warren Ziegle= r <wd2xgj@gmail.com= > wrote:
Hello Danie= le,

   A couple of possibilities for a quick and easy whi= stler 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.no= rthcountryradio.com/Kitpages/elfrcvr.htm

3) Ten-Tec used to mak= e a high gain audio amplifier kit, I don't see it on their web page at the=   moment but perhaps you can find one?


   &= nbsp; Personally I have the North Country receiver, it works fine but I ca= n't get to quiet locations all that often, my best results have been at th= e seaside away from power lines.

--
73 Warren K2ORS
      &nbs= p;         WD2XGJ
        &nbs= p;       WD2XSH/23
          &n= bsp;     WE2XEB/2
           =     WE2XGR/1

 

On Tue, Oct 5, 2010 at 11:00 AM, Daniele Tinca= ni <daniele= tincani@yahoo.com> 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&= nbsp;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 affectin= g 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 th= at 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 no= ise 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 fl= oor, so it would be not "politically" easy to install a long coax cable ac= ross the property and up to my balcony :-). More complex solutions like re= motely-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 fo= r "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&nb= sp;short free-time I have for homebrewing. Please suggest any suitable sol= ution that you could have information on.
 
Cheers
D.
From: Warren Ziegler <<= A href=3D"mailto:wd2xgj@gmail.com">wd2xgj@gmail.com>
To: rsgb_lf_group@blacksheep.org
Sent: Tue, October 5, 2010 4:09:01 PM
Subject: Re: VLF: Inspire VLF-3 re= ceiver

Daniele,
   The Inspire kit is a broadband high gain= audio amplifier with a very high input impedance - generically its a 'whi= stler 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
              &nb= sp; WE2XEB/2
                WE= 2XGR/1

 

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










 
=3D --_5f03f2ee-099b-4bdd-9896-dd1c4e0017ae_--