![]() Therefore, please consider these values a rough rule of thumb for anyone who does not have an LCR meter. ![]() ![]() In addition, there are different manufacturers making ferrite rods using different formulas. The values shown in the table below (for MW coverage) are approximate because there is bound to be variance in CAT5e cable formula from one manufacturer to another. With the use of the calculators in the following pages, you should be able to build an accurate coil for almost any variable capacitor value. If the capacitor value is slightly less, then they usually increase the number of turns in the coil. Therefore, as a general rule of thumb, radio engineers tend to design their tank circuits around 300 µH coil and 300 pF variable capacitor. Radio engineers usually like to build a coil that is approximately 300 µH in value, because it requires a variable capacitor that ranges in value from 32 pF to 304 pF. ![]() Let us assume that we wish to design a coil with an approximate operating range of 526.5 kHz to 1606.5 kHz in the medium wave band. This article takes the guesswork out of building a coil, and shows how you could calculate the values to design and build an accurate tank circuit. Designing an AM radio ferrite rod antenna coil (also known as tank circuit) for a crystal radio project or any radio project is something GCSE students and hobbyists love rushing into with guesswork.
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