This transmitter for the 3.5 and 7 MHz ham radio was found in a 1950s Japan publication. No information was given on the coils and the power supply.
This notch filter or reject filter rejects signals of a certain frequency with good selectivity. The...
The purpose of this circuit, which we find in a 1975 radio amateur publication, is to measure the...
The coils of this simple mid-wave radius are wound 28 or 26 on a 12 to 30 cm long ferrite rod and the...