Message-ID: <582B8AF4.5010800@posteo.de>
Date: Tue, 15 Nov 2016 23:23:48 +0100
From: DK7FC <selberdenken@posteo.de>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3
MIME-Version: 1.0
To: rsgb_lf_group@blacksheep.org
References: <154c32c4dba-373a-24653@webprd-m58.mail.aol.com> <5817DE39.9010506@posteo.de> <5818DDAB.7000804@abelian.org> <5819E3AA.3020906@posteo.de> <581A452F.6060506@abelian.org> <581A4BC6.9030106@abelian.org> <581A541E.9050406@abelian.org> <581A8098.8050909@posteo.de> <581C3027.8050003@abelian.org> <581C8660.1070709@posteo.de> <581C90C7.5030809@abelian.org> <581C95BC.6010602@posteo.de> <581DA8E4.5010701@abelian.org> <581DB9C0.10602@posteo.de> <581DCF2E.5090902@abelian.org> <581F9797.9060709@abelian.org> <5824A47D.3060108@posteo.de> <58260EC4.70903@abelian.org> <58261368.60901@posteo.de> <58261772.3050508@abelian.org> <5826BF91.6070907@abelian.org> <5826DB6E.1060000@abelian.org> <58276523.4000204@abelian.org> <5829D9E1.2020801@posteo.de> <582A0BF2.5070101@abelian.org> <582AB6CD.5090603@abelian.org> <582B12B2.7080708@posteo.de> <582B3823.8090504@abelian.org> <582B4466.5070106@abelian.org> <582B6E8B.4090207@posteo.de> <39dd0736-e97c-2b26-2e47-5fb2b4c4f429@virginbroadband.com.au>
In-Reply-To: <39dd0736-e97c-2b26-2e47-5fb2b4c4f429@virginbroadband.com.au>
Subject: Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz
Content-Type: multipart/alternative;
 boundary="------------080604080604030008090704"
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org
Content-Length: 4272
Status: O

This is a multi-part message in MIME format.
--------------080604080604030008090704
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit

Hi Edgar,

Good morning! :-)
For a first test it would be nice to have a stereo soundcard (mic input) 
and two orthogonal loops. Precise timing could be added later but i know 
you already are equipped with GPS modules.
Did you ever play with the RDF function in SpecLab? It would be 
interesting to see the strength and colour changes from the various MSK 
transmitters.
Could you run a VLF grabber showing a 'wideband' window like on 
http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html 
(offline since a few minutes, the Raspi needs a reboot :-( ) but in RDF 
mode?
As an antenna you could use single turn loops, maybe with 3m diameter. 
Do you have such a property allowing to install such loops in a quiet 
location? The loops would be non-resonated. And it would be useful to 
place them in some distance to each other to reduce the coupling. You 
will need a preamp which you can build yourselfe. Maybe you will even 
get some very first results without a preamp, depending on the loop size...
Once you have a grabber running and we see some signals appearing, we 
can talk about improvements.
Just some first ideas...

73, Stefan

PS: In the past, i build a pair of orthogonal loops from 2 cheap 10m 
long CAT5 LAN cables, formed to a pyramid. All 8 wires were switched in 
series. Another idea... In principle a larger loop helps since you need 
less amplification and don't need to struggle with pre-amp noise figures 
and so on...

Good night.

Am 15.11.2016 22:58, schrieb edgar:
> Hi Stefan,
>
> Looks like the Super Moon has you dreaming, again.
>
> What equipment set-up would be needed to try?
>
> Regards, Edgar
> Moonah, Tasmania.

--------------080604080604030008090704
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: 7bit

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
  <meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
Hi Edgar,<br>
<br>
Good morning! :-)<br>
For a first test it would be nice to have a stereo soundcard (mic
input) and two orthogonal loops. Precise timing could be added later
but i know you already are equipped with GPS modules.<br>
Did you ever play with the RDF function in SpecLab? It would be
interesting to see the strength and colour changes from the various MSK
transmitters. <br>
Could you run a VLF grabber showing a 'wideband' window like on
<a class="moz-txt-link-freetext" href="http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html">http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html</a>
(offline since a few minutes, the Raspi needs a reboot :-( ) but in RDF
mode?<br>
As an antenna you could use single turn loops, maybe with 3m diameter.
Do you have such a property allowing to install such loops in a quiet
location? The loops would be non-resonated. And it would be useful to
place them in some distance to each other to reduce the coupling. You
will need a preamp which you can build yourselfe. Maybe you will even
get some very first results without a preamp, depending on the loop
size...<br>
Once you have a grabber running and we see some signals appearing, we
can talk about improvements.<br>
Just some first ideas...<br>
<br>
73, Stefan<br>
<br>
PS: In the past, i build a pair of orthogonal loops from 2 cheap 10m
long CAT5 LAN cables, formed to a pyramid. All 8 wires were switched in
series. Another idea... In principle a larger loop helps since you need
less amplification and don't need to struggle with pre-amp noise
figures and so on...<br>
<br>
Good night.<br>
<br>
Am 15.11.2016 22:58, schrieb edgar:
<blockquote
 cite="mid:39dd0736-e97c-2b26-2e47-5fb2b4c4f429@virginbroadband.com.au"
 type="cite">
  <meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
  <font face="Arial">Hi Stefan,<br>
  <br>
Looks like the Super Moon has you dreaming, again.<br>
  <br>
What equipment set-up would be needed to try?<br>
  <br>
Regards, Edgar<br>
Moonah, Tasmania.<br>
  </font> </blockquote>
</body>
</html>

--------------080604080604030008090704--