Message-ID: <4D25ACDA.1090807@iup.uni-heidelberg.de>
Date: Thu, 06 Jan 2011 12:51:54 +0100
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <schaefer@iup.uni-heidelberg.de>
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References: <3F10330D89BC46B2B0071A38A6E5EC09@PCFausto>
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Subject: Re: LF: Vertical antenna and connection line
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Fausto,

You can do that but you should place the ladder line between ground and 
the "cold" end of the main coil. Otherwise you'll have several kV in the 
shack and lower the radiation resistance strongly! Instead of ladder 
line you could use coax cable as well, although it has much more C per 
meter.
You even can add a galvanic decoupled primary winding on the coil and 
feed the RF through a coax cable such as RG213. Then you can fine tune 
the system (e.g. for QSY within the band) in the shack, at a lower 
impedance!

Do you already have some data like the ground resistance and/or your 
planned TX power? :-)

73, Stefan

Am 06.01.2011 12:28, schrieb Fausto Coletti:
> Hello,
> A question for RF expert:
> you think that i can connect a Marconi antenna and relative gound 
> system to the variometer with a high impedance ladder line?
> This because i need to have all the tuning equipment indoor and the 
> tower that support the vertical part
> of the antenna is about at 20 meters to the home.
> Thanks in advance for answer
> Fausto IK4NMF

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Fausto,<br>
<br>
You can do that but you should place the ladder line between ground and
the "cold" end of the main coil. Otherwise you'll have several kV in
the shack and lower the radiation resistance strongly! Instead of
ladder line you could use coax cable as well, although it has much more
C per meter. <br>
You even can add a galvanic decoupled primary winding on the coil and
feed the RF through a coax cable such as RG213. Then you can fine tune
the system (e.g. for QSY within the band) in the shack, at a lower
impedance!<br>
<br>
Do you already have some data like the ground resistance and/or your
planned TX power? :-)<br>
<br>
73, Stefan<br>
<br>
Am 06.01.2011 12:28, schrieb Fausto Coletti:
<blockquote cite="mid:3F10330D89BC46B2B0071A38A6E5EC09@PCFausto"   type="cite">
  <meta content="text/html; charset=ISO-8859-1"   http-equiv="Content-Type">
  <meta name="GENERATOR" content="MSHTML 8.00.6001.18999">
  <style></style>
  <div><font face="Arial" size="2">Hello, </font></div>
  <div><font face="Arial" size="2">A question for RF expert: </font></div>
  <div><font face="Arial" size="2">you think that i can connect a
Marconi antenna and relative gound system to&nbsp;the variometer with a&nbsp;high
impedance ladder line? </font></div>
  <div><font face="Arial" size="2">This because i need to have all
the&nbsp;tuning equipment indoor and the tower that support the vertical
part </font></div>
  <div><font face="Arial" size="2">of the antenna is about at 20&nbsp;meters
to the home. </font></div>
  <div>&nbsp;</div>
  <div><font face="Arial" size="2">Thanks in advance for answer </font></div>
  <div>&nbsp;</div>
  <div><font face="Arial" size="2">Fausto IK4NMF</font></div>
</blockquote>
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