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Re: LF: Vertical antenna and connection line

from [Stefan Schäfer] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: Vertical antenna and connection line
From: Stefan Schäfer <[email protected]>
Date: Thu, 06 Jan 2011 12:51:54 +0100
In-reply-to: <3F10330D89BC46B2B0071A38A6E5EC09@PCFausto>
References: <3F10330D89BC46B2B0071A38A6E5EC09@PCFausto>
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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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