Amateur Radio as a hobby has a long history of encouraging experimentation using whatever one might have on hand. When [Tom Essenpreis] wanted to use his 14 MHz antenna outside of its designed ...

[Scott Harden] has been working through a design for a variable inductor to use as a PTO, or permeability tuned oscillator. What you see above is the most recent fruit of these efforts. The variable ...

When choosing a conductor for use in an electronic circuit, there are several important properties that may need to be considered. The wire thickness and resistivity determines the current carrying ...

Marked: "Variable Inductor / Type 107F Serial No. 1926 / General Radio Co. / Cambridge, Mass." Unit consists of two coils, both cylindrical sections mounted such that one rotates within the other. Two ...

OBJECTIVE: You will wind (and test) your own inductor, which you will also use in the AM radio project in a subsequent lab. You will also investigate the properties of capacitors by making a simple ...