The 425 grams loop

This loop was develop to a plug and play operation and I design a special ultra light variable capacitor with sliding cooper printed circuit boards.


The lower part of the antenna is covered by handles bike foam, and a wood stick moves the sliding board adjusting the resonant frequency by the command of the thumb.


The same hand that holds this 425 grams antenna is the hand t hat is used to tune, making the pedestrian operation a child’s play.

Over the sliding part is a calibrated frequency scale that gives instant view of the operation frequency.

On the top is a permanently soldered capacitor connected to an alligator clip to lower the operation frequency to 40 meters.

PY1 AHD ALEX (Alexandre Grimberg).

e-mail: py1ahd@ig.com.br