Center-Tapped coil?

I have a circuit here that seems to have a center-tapped coil. I don't recall that simple coils have center taps. Also, there are three "T" values that I don't understand. I simply need a quick refresher on coils apparently. Since I cannot find a way to include a diagram without an associated URL, I can say it is a simple coin winding (not a transformer) with a center-tap leading to a capacitor. One end of the coil is marked 15T (or 1 5T), the center tap is marked 5T and the other end, leading to another cap is marked 0T (zero T). I should know this already, but you know how memory is.

Charles Sands
Smyrna, TN

T is likely TURNS. Sounds like some sort of RF coil.

Yes, it is. It is a shortwave receiver circuit. When I build this, shouild I get a specific coil type or can I make my own? The center tapped part has me stumped.

As a ham, I have often used**broken link removed**. You just solder a wire to where you want the tap. It sounds to me that your coil has a total of 15T, with the Tap connected to the 5th T. There are lots of on-line Inductance calculators where you put in the number of T, the length, the diameter, etc.

btw-I wouldn't describe your coil as center-tapped; more like the tap is 1/3 of the way up...

Thank You. That must be why the "tap" is intentionally not centered. It makes sense now. I never have been very good with coils.