From: Rik Strobbe <Rik.Strobbe@fys.kuleuven.be>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Date: Thu, 6 Jan 2011 12:33:07 +0100
Thread-Topic: Vertical antenna and connection line
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References: <3F10330D89BC46B2B0071A38A6E5EC09@PCFausto>
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Subject: LF: RE: Vertical antenna and connection line
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Fausto,

as the length of the line (20m) is only a very small part of the wavelengt=
h (less than 1% at 137kHz) the impedance does not matter too much.
But after the variometer you will have a very high voltage (can be 10kV or=
 more, depending on antenna capacitance, loss resistance and power), so th=
e line must be capable to handle this voltage.

73, Rik  ON7YD - OR7T

________________________________
Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.or=
g] namens Fausto Coletti [faustocoletti@alice.it]
Verzonden: donderdag 6 januari 2011 12:28
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: LF: Vertical antenna and connection line

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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<div>Fausto,</div>
<div>&nbsp;</div>
<div>as the length of the line (20m) is only a very small part of the wave=
length (less than 1% at 137kHz) the impedance does not matter too much.</d=
iv>
<div>But after the variometer you will have a very high voltage (can be 10=
kV or more, depending on antenna capacitance, loss resistance and power),=
 so the line must be capable to handle this voltage.</div>
<div>&nbsp;</div>
<div>73, Rik&nbsp; ON7YD - OR7T</div>
<div dir=3D"ltr"><font color=3D"#000000" size=3D"2" face=3D"Tahoma"></font=
>&nbsp;</div>
<div style=3D"DIRECTION: ltr" id=3D"divRpF164960">
<hr tabindex=3D"-1">
<font color=3D"#000000" size=3D"2" face=3D"Tahoma"><b>Van:</b> owner-rsgb_=
lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] namens Fausto=
 Coletti [faustocoletti@alice.it]<br>
<b>Verzonden:</b> donderdag 6 januari 2011 12:28<br>
<b>Aan:</b> rsgb_lf_group@blacksheep.org<br>
<b>Onderwerp:</b> LF: Vertical antenna and connection line<br>
</font><br>
</div>
<div></div>
<div>
<div><font size=3D"2" face=3D"Arial">Hello, </font></div>
<div><font size=3D"2" face=3D"Arial">A question for RF expert: </font></di=
v>
<div><font size=3D"2" face=3D"Arial">you think that i can connect a Marcon=
i antenna and relative gound system to&nbsp;the variometer with a&nbsp;hig=
h impedance ladder line?
</font></div>
<div><font size=3D"2" face=3D"Arial">This because i need to have all the&n=
bsp;tuning equipment indoor and the tower that support the vertical part
</font></div>
<div><font size=3D"2" face=3D"Arial">of the antenna is about at 20&nbsp;me=
ters to the home.
</font></div>
<div><font size=3D"2" face=3D"Arial"></font>&nbsp;</div>
<div><font size=3D"2" face=3D"Arial">Thanks in advance for answer </font><=
/div>
<div><font size=3D"2" face=3D"Arial"></font>&nbsp;</div>
<div><font size=3D"2" face=3D"Arial">Fausto IK4NMF</font></div>
</div>
</div>
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