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From: DK1IS <DK1IS@kabelmail.de>
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Date: Mon, 16 May 2016 12:02:16 +0200
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Subject: Re: LF: A transductor instead of a traditional variometer on
 VLF/LF/MF? Done!
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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?

73,
Tom, DK1IS