This is a demonstration of a crystal radio that works on different radio bands from the medium wave band up to the higher short wave bands. The ground is connected to a ground rod outside the house or to a metal water pipe. The antenna is a long wire about 20 meters long in the open space. The bands are changed by replacing the coils with another coil set needed for the required band. The tuning is done using the two sections connected together of a 2J gang capacitor, used in earlier radios. The antenna coupling may be adjusted by putting the required value of C1 or by utilizing adequate number of turns in the primary winding in the coil.
Watch the Video: https://youtu.be/EUd2PhyUZ6A
No comments:
Post a Comment