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Re: LF: A transductor instead of a traditional variometer on VLF/LF/MF?

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Subject: Re: LF: A transductor instead of a traditional variometer on VLF/LF/MF? Done!
From: DK1IS <[email protected]>
Date: Mon, 16 May 2016 12:02:16 +0200
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Am 16.05.2016 um 11:20 schrieb Wolfgang Büscher:
Or, depending on how the ring core is oriented in the "mostly air core" coil, the AC flux lines would run perpendicular to the DC flux, which also eliminate the need for a large AC-blocking coil for the DC exciation.
That´s right, Wolf, but I think Stefans latest approach is to use the transductor as an external inductivity in series with the main coil and no longer as a ferrite core with controllable permeability inside the main coil (what should be possible too). Nice idea anyway but as Roeloff alredy asked: what about the Q of the variable unit? Its influence on the whole system shouldn´t be so large because of the only small variable part of the inductivity but one should take care for a possible heating of the transductor cores at full antenna current. Already tested, Stefan?
Tom, DK1IS

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