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Re: LF: LF daylight test close to the north hemisphere solstice

To: [email protected]
Subject: Re: LF: LF daylight test close to the north hemisphere solstice
From: DK7FC <[email protected]>
Date: Wed, 05 Jun 2019 08:16:12 +0200
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In-reply-to: <[email protected]cal>
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Hi Luis,

No, i just mean a second transformer between PA and the other transformer, into the coax line. A simple 1:1 ferrite transformer. Your ground conductors into and arround the building are a part of the antenna, obviously causing a high voltage between that ground and your shack ground. All you can do is reducing the coupling impedance (capacitive) and the electrical field strength. A well dimensioned 1:1 transformer will provide a good decoupling and low losses. The improved decoupling may change the resonance a bit (because your shack earth is less a part of the system taking RF currents), so a retuning is required. Hopefully your shack earth is not the dominant part of the antenna ground :-) The less it is a part of the ground system, the less is the detuning of the antenna when inserting the second transformer.
73, Stefan

Am 04.06.2019 10:59, schrieb VIGILANT Luis Fernández:
This week I should have to rework the PA output transformer. The one
in use lacks good isolation and get arcs when pushing it a bit. All
going Ok may be I can still rise some dB

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