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Date: Tue, 5 Oct 2010 08:00:43 -0700 (PDT)
From: Daniele Tincani <danieletincani@yahoo.com>
To: rsgb_lf_group@blacksheep.org
In-Reply-To: <AANLkTinSONqOGzz4L5NTEs9qRhP1tcv65N51-W561XhX@mail.gmail.com>
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Subject: Re: VLF: Inspire VLF-3 receiver
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Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: quoted-printable

Hello Warren,=20

yes, I see. However, I did=A0not intend to=A0use the=A0VLF-3 for=A0sub-9KH=
z ham radio=20
listening, rather I'm looking for=A0a VLF=A0reception solution=A0that I co=
uld possibly=20
move away from domestic noise and take with me for a walk in the countrysi=
de.
My reasoning is: I'm pretty sure :-) that I have hum at home affecting rec=
eption=20
below 10KHz. I will try a small passive HPF just to see if it improves thi=
ngs a=20
bit, but I'm not confident about this attempt, given that probably the noi=
se is=20
not generated by saturation in the pre-amp or the soundcard. Of course the=
=20
pre-amp and the soundcard have=A0their own noise floor, but it seems to me=
 that=20
external noise is well above it. Given this situation, I think that no=20
home-based receiver could really remove the problem at my current location=
.
On the other hand,=A0I live in a jointly-owned building, at 5th floor, so=
 it would=20
be not "politically" easy to install a long coax cable across the property=
 and=20
up to my balcony :-). More complex solutions like remotely-interfaced ante=
nnas,=20
etc. are out of my budget for VLF at present (in terms of spare time for=
 study,=20
setup, etc.=A0:-)).
In summary, while trying to improve my current loop and pre-amp,=A0I think=
 that=20
building an E-probe could add a bit to my current experience with VLF "ant=
ennas"=20
and could probably result in a more handy solution for "in-the-field" list=
ening=20
sessions.
I'm interested in a portable VLF receiver (more general-purpose than VLF-3=
, if=20
possible). Ready-to-mount kits are preferable because of the=A0short free-=
time I=20
have for homebrewing. Please suggest any suitable solution that you could=
 have=20
information on.

Cheers
D.




________________________________
From: Warren Ziegler <wd2xgj@gmail.com>
To: rsgb_lf_group@blacksheep.org
Sent: Tue, October 5, 2010 4:09:01 PM
Subject: Re: VLF: Inspire VLF-3 receiver

Daniele,
=A0=A0 The Inspire kit is a broadband high gain audio amplifier with a ver=
y high=20
input impedance - generically its a 'whistler receiver'.
Whistler receivers like Inspire are good for listening to whistlers, tweek=
s,=20
dawn chorus etc but it would be completely useless for listening to amateu=
r VLF=20
experiments - its broadband, has no 'bfo' to detect a carrier and would be=
=20
difficult to interface to a sound card.


--=20
73 Warren K2ORS
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 WD2XGJ=20
=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>=
=20
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
>


     =20

--0-1205377338-1286290843=:79702
Content-Type: text/html; charset=iso-8859-1
Content-Transfer-Encoding: quoted-printable

<html><head><style type=3D"text/css"><!-- DIV {margin:0px;} --></style></h=
ead><body><div style=3D"font-family:arial, helvetica, sans-serif;font-size=
:10pt"><DIV>Hello Warren, </DIV>
<DIV>&nbsp;</DIV>
<DIV>yes, I see. However, I did&nbsp;not intend to&nbsp;use the&nbsp;VLF-3=
 for&nbsp;sub-9KHz ham radio listening, rather I'm looking for&nbsp;a VLF&=
nbsp;reception solution&nbsp;that I could possibly move away from domestic=
 noise and take with me for a walk in the countryside.</DIV>
<DIV>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&nbsp;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.</DIV>
<DIV>On the other hand,&nbsp;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.&nbsp;:-)).</DIV>
<DIV>In summary, while trying to improve my current loop and pre-amp,&nbsp=
;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.</DIV>
<DIV>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.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Cheers</DIV>
<DIV>D.<BR></DIV>
<DIV style=3D"FONT-SIZE: 10pt; FONT-FAMILY: arial, helvetica, sans-serif">=
<BR>
<DIV style=3D"FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, tim=
es, serif"><FONT face=3DTahoma size=3D2>
<HR SIZE=3D1>
<B><SPAN style=3D"FONT-WEIGHT: bold">From:</SPAN></B> Warren Ziegler &lt;w=
d2xgj@gmail.com&gt;<BR><B><SPAN style=3D"FONT-WEIGHT: bold">To:</SPAN></B>=
 rsgb_lf_group@blacksheep.org<BR><B><SPAN style=3D"FONT-WEIGHT: bold">Sent=
:</SPAN></B> Tue, October 5, 2010 4:09:01 PM<BR><B><SPAN style=3D"FONT-WEI=
GHT: bold">Subject:</SPAN></B> Re: VLF: Inspire VLF-3 receiver<BR></FONT><=
BR>
<META http-equiv=3Dx-dns-prefetch-control content=3Doff>Daniele,<BR>&nbsp;=
&nbsp; The Inspire kit is a broadband high gain audio amplifier with a ver=
y high input impedance - generically its a 'whistler receiver'.<BR>Whistle=
r receivers like Inspire are good for listening to whistlers, tweeks, dawn=
 chorus etc but it would be completely useless for listening to amateur VL=
F experiments - its broadband, has no 'bfo' to detect a carrier and would=
 be difficult to interface to a sound card.<BR><BR><BR>-- <BR>73 Warren K2=
ORS<BR>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; WD2XGJ <BR>=
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; WD2XSH/23<BR>&nbsp=
; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; WE2XEB/2<BR>&nbsp; &nbs=
p; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; WE2XGR/1<BR><BR>&nbsp;<BR><BR=
>
<DIV class=3Dgmail_quote>On Tue, Oct 5, 2010 at 4:43 AM, Daniele Tincani=
 <SPAN dir=3Dltr>&lt;<A href=3D"mailto:danieletincani@yahoo.com" target=3D=
_blank rel=3Dnofollow ymailto=3D"mailto:danieletincani@yahoo.com">danielet=
incani@yahoo.com</A>&gt;</SPAN> wrote:<BR>
<BLOCKQUOTE class=3Dgmail_quote style=3D"PADDING-LEFT: 1ex; MARGIN: 0pt 0p=
t 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid">
<DIV>
<DIV style=3D"FONT-SIZE: 10pt; FONT-FAMILY: arial, helvetica, sans-serif">
<DIV>Hi VLF,</DIV>
<DIV>&nbsp;</DIV>
<DIV>any opinions about the Inspire VLF-3 receiver kit?</DIV>
<DIV>http://theinspireproject.org/uploads/PDF/Theory_of_Operations.pdf</DI=
V>
<DIV>Thank you in advance for your feedbacks.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Regards</DIV>
<DIV>Daniele</DIV></DIV><FONT color=3D#888888><BR></FONT></DIV></BLOCKQUOT=
E></DIV><BR><BR clear=3Dall><BR>
<META http-equiv=3Dx-dns-prefetch-control content=3Don></DIV></DIV></div><=
br>

      </body></html>

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