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Sunday, August 08, 2010

The Variable Capacitor & Magnetic Loop Antenna Project

I finally decided to start the project after being delayed for a long-long time... getting a 1mm aluminum sheet is not so easy as most of the seller only sells 4' x 8' size.
I used one of the drawing found on the internet and cut the sheets using my DIY CNC router that I build a few years ago..
The loop will be made from a aluminum bicycle rim for now. In the future, I am planning to use 30mm aluminum tubes but will settle with bicycle rim for now..At the moment, I have not measured the capacitance of the butterfly capacitor as I do not have the capacitance meter. Will leave that to 9M2CF I guess.. During testing with the new capacitor, I can tune to 10m but unable to reach 20m.. I need to increase the loop diameter and will do that when I decided to rebuild it with the 30mm tube later...


5 comments:

ian said...

Thank you! You often write very interesting articles. You improved my mood.

9M2PJU said...

Salam, boleh saya order capacitor dari anda ?

Anonymous said...

You can boost the voltage and capacitance rating of an air variable capacitor by immersing it in oil. Paraffin oil would be a good choice giving up to 2 times the capacitance and 10 times the voltage rating.

Miguel PU5OAM said...

You can send me the G CNC program for the capacitor.
Miguel PU5OAM

9w2dtr said...

Hi Miguel,
Thank you for visiting my blog pages. Unfortunately, the CNC has been sold long time ago and I no longer keep the G code. I deleted it when I reformat the PC. I am so sorry...