[AMPS] Coax as an RF choke??

[Ian White, G3SEK]

Johan Nordin wrote:
>
>Currently building a g-g amp on 2m with a GS35b
>
>There are several schematics floating around for
>this device including construction of RF chokes
>for filament and HT etc...
>I was thinking of making chokes of quarterwaves of thin
>coax, (grounded with respect to RF at the far end of the tube).
>Would like to try it at least as filament chokes instead of
>bifilar windings.
>The length of the cables will not be so long at VHF/UHF
>and it would be easy and quick to make theese RF chokes
>on any VHF/UHF frequency ( For thoose of us who are not familiar
>with calculations with the traditional designs).
>
>Just a thought, good or bad?

Sure, it works fine. UT141 semi-rigid is OK at these currents, and you
do not need a quarter-wave if you wind it into a coil.

73 from Ian G3SEK          Editor, 'The VHF/UHF DX Book'
                          'In Practice' columnist for RadCom (RSGB)
                           http://www.ifwtech.com/g3sek

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