Message-ID: <4CA11E47.5020902@iup.uni-heidelberg.de>
Date: Tue, 28 Sep 2010 00:44:23 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <schaefer@iup.uni-heidelberg.de>
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References: <AANLkTinsoxgfUWU1o-JxrpVn0fcDhbWDMdO0BhD7gpfV@mail.gmail.com> <4CA0FB40.5060404@telus.net> <4CA100C6.3080505@iup.uni-heidelberg.de> <4CA116AA.5010905@telus.net>
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Subject: Re: LF: Loops on TX
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Scott,

A very interesting mail!

Am 28.09.2010 00:11, schrieb Scott Tilley:
> A loop made for a very nice compromise...
If you can work JA / 7200 km in QRSS-10 it is not a compromise but=20
probably one of the best antennas available for amateurs in the moment.

>   As I have lots of convenient trees to support this so it is viable=20
> here and will improve my RX situation as well...

Scott, don't you want to give VLF a chance? If you have so much space=20
(like i have too in the Heidelberg's forest, but not as close to my home=
=20
QTH), you could try to build a (earth) loop of some 10000 m^2 and could=20
start a canadian VLF experiment!? I would watch out for your signal! :-)

And what about a full size dipole for LF? 1000m is not the problem i=20
assume? This may be an interesting alternative like you can see on my=20
recent earth antenna tests. Here my antenna is not just working as a=20
loop since the length comes near lambda. Maybe a dipole can give you an=20
equal efficiency but can be built out of thinner wire and is easier to=20
fed with RF.

What distance do i have to reach on LF with my earth electrode antenna=20
so that you will see it as an interesting alternative, hi :-)

LF QRN comes down in the last days. Maybe i will do some changes on my=20
LF active antenna circuit tomorrow (filters). I assume i can get another=
=20
3 dB or so of efficiency. Then, i hope to receive your signal this=20
winther. And you will see mine! ;-)

73, Stefan/DK7FC
>
> My experiments with verticals have come to an end at this QTH.  Not to=
=20
> say that in the future I will not experiment with them at other QTHs=20
> but they simply don't suit this QTH.  That's the secret in my opinion=20
> of getting a decent signal out is finding an antenna that maximizes=20
> the potential of a particular QTH not following a dogma certain=20
> mal-contents seem to preach...
>
> 73 Scott
> VE7TIL
> http://www3.telus.net/sthed/argo/
>
>
>
>
>
>
>
>
>
>
>
> On 9/27/2010 8:38 PM, Stefan Sch=E4fer wrote:
>> LF,
>>
>> Am 27.09.2010 22:14, schrieb Scott Tilley:
>>> If someone knows the relationships for how a loop behaves over=20
>>> ground I'd love to see them too!
>>
>> Can't this be done in EZNEC?
>>
>> Scott, this sound really impressive. I have thought your loop area is=
=20
>> even higher. So, if i can find and climb some trees, i could try to=20
>> test a closed loop as well. Sounds like an alternative, maybe.
>>
>> What about RG213 as the loop conductor, i mean the shielding? If the=20
>> supports are not spaced to much, like some trees, this could work.=20
>> Starting with a small wire, carrying a bigger one and so on. Oh dear,=
=20
>> so many ideas, help!
>>
>> 73, Stefan

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Scott, <br>
<br>
A very interesting mail! <br>
<br>
Am 28.09.2010 00:11, schrieb Scott Tilley:
<blockquote cite="mid:4CA116AA.5010905@telus.net" type="cite">
  <meta content="text/html; charset=ISO-8859-1"   http-equiv="Content-Type">
A loop made for a very nice compromise...</blockquote>
If you can work JA / 7200 km in QRSS-10 it is not a compromise but
probably one of the best antennas available for amateurs in the moment.<br>
<br>
<blockquote cite="mid:4CA116AA.5010905@telus.net" type="cite">&nbsp; As I
have lots of convenient trees to support this so it is viable here and
will improve my RX situation as well...<br>
</blockquote>
<br>
Scott, don't you want to give VLF a chance? If you have so much space
(like i have too in the Heidelberg's forest, but not as close to my
home QTH), you could try to build a (earth) loop of some 10000 m^2 and
could start a canadian VLF experiment!? I would watch out for your
signal! :-)<br>
<br>
And what about a full size dipole for LF? 1000m is not the problem i
assume? This may be an interesting alternative like you can see on my
recent earth antenna tests. Here my antenna is not just working as a
loop since the length comes near lambda. Maybe a dipole can give you an
equal efficiency but can be built out of thinner wire and is easier to
fed with RF.<br>
<br>
What distance do i have to reach on LF with my earth electrode antenna
so that you will see it as an interesting alternative, hi :-)<br>
<br>
LF QRN comes down in the last days. Maybe i will do some changes on my
LF active antenna circuit tomorrow (filters). I assume i can get
another 3 dB or so of efficiency. Then, i hope to receive your signal
this winther. And you will see mine! ;-)<br>
<br>
73, Stefan/DK7FC<br>
<blockquote cite="mid:4CA116AA.5010905@telus.net" type="cite"> <br>
My experiments with verticals have come to an end at this QTH.&nbsp; Not to
say that in the future I will not experiment with them at other QTHs
but they simply don't suit this QTH.&nbsp; That's the secret in my opinion
of getting a decent signal out is finding an antenna that maximizes the
potential of a particular QTH not following a dogma certain
mal-contents seem to preach...<br>
  <br>
73 Scott<br>
VE7TIL<br>
  <a moz-do-not-send="true" class="moz-txt-link-freetext"   href="http://www3.telus.net/sthed/argo/">http://www3.telus.net/sthed/argo/</a><br>
  <br>
  <br>
  <br>
  <br>
  <br>
  <br>
  <br>
  <br>
  <br>
  <br>
  <br>
On 9/27/2010 8:38 PM, Stefan Sch&auml;fer wrote:
  <blockquote cite="mid:4CA100C6.3080505@iup.uni-heidelberg.de"   type="cite">
    <meta content="text/html; charset=ISO-8859-1"   http-equiv="Content-Type">
LF,<br>
    <br>
Am 27.09.2010 22:14, schrieb Scott Tilley:
    <blockquote cite="mid:4CA0FB40.5060404@telus.net" type="cite">
      <meta content="text/html; charset=ISO-8859-1"   http-equiv="Content-Type">
If someone knows the relationships for how a loop behaves over ground
I'd love to see them too!<br>
    </blockquote>
    <br>
Can't this be done in EZNEC?<br>
    <br>
Scott, this sound really impressive. I have thought your loop area is
even higher. So, if i can find and climb some trees, i could try to
test a closed loop as well. Sounds like an alternative, maybe. <br>
    <br>
What about RG213 as the loop conductor, i mean the shielding? If the
supports are not spaced to much, like some trees, this could work.
Starting with a small wire, carrying a bigger one and so on. Oh dear,
so many ideas, help!<br>
    <br>
73, Stefan<br>
  </blockquote>
</blockquote>
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