[Morgan]

Originally Posted by Morgan

Here it is how to make the PDK-2.1 with a 3 options switch that can change the 77KHz standard frequency :

1- open the box cover carefuly,and on the right top part of the box you will find the cables who go for the RX coil, this cables as one 6N8 capacitor in paralel ,this cap. is responsable to keep the frequency.

2-cut the RX coil cables near the PCB , and cut the two legs of this 6N8 cap. at midle,and solder in this pins the two cables of the frequencies selector.
Make a hole on top of the box to install the selector.

this simple selector can help ONLY in countries that other frequencies work better than the standard 77KHz.