My trials and tribulations

Hi all ,this blog is going to show some of the tricks in my life ,Enjoy !

Saturday 7 October 2017

120mm Variable air capacitor

Wow it's been a while since the last post ...dont time fly!! Im wanting  a big auto ATU to handle some big doublets ,nothing on the market ...well for normal men money anyhow ! So here we go with the first thing ..the variable air capacitor. Plates are made from 1.5mm alloy 1000 series which i drew up and got laser cut ,bearings off ebay for a few pence.
 6mm brass rod holds it all together

 Plates on rotating shaft

 Fixed plates on rod ,I drilled the nuts out to 6.3mm to slip over the thread ,makes it a lot quicker and by far less tedious.

 fitted together ready to line up .Insulator is made from bakerlite .

 Adjustment is via the fixed plates jacking the plates one way or the other

 All together and meshing nicely.

Measurements are 1680pf in full mesh ,will have to mount isolated from chassis to keep the minimum capacitance down ....Should of been a butterfly .After all this i recon i could make it with twice the space ....ill get some spacers !!!

No comments:

Post a Comment