Monday, February 15, 2016

A slug tuned coil from a straw and a brazing rod.

I drilled a bolt down the center and tapped it to accept the tuning slug. This allowed me to use a nut to fasten it to the faceplate. You could just use a nut glued to the straw and faceplate for a permanent installation.
An iron core could be used but for RF the brass has less loss and gives an increase in frequency as you screw it in.

This post explains the effect of the brass slug


This one is same concept with a different support and pictures of the construction.

Adjustable coil

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