Total posts : 45366
by MRAM 1500 kHz
Speaking of loading coils, I also wound one to experiment with (re-invent the wheel.)
Depending upon your power output, make sure to have adequate space between turns of that enameled wire or they will arc.
Testing mine on the bench, I purposely ran the power up to about 3 watts to see what kind of voltages developed. The cold end of the coil returned to ground, the hot transmitter lead was tapped up about 3 to 5 turns from the cold end and the 8 foot antenna wire was moved to various taps for best field strength. It ended up about 50 or so turns from the cold end.
The screw driver with the neon lamp voltage detector lit up quite nicely and those usually take around 70 to 90 volts just to glow. Putting it at the top end of the coil really lit it up! Just like the old Tesla Coils. And yes, it drew an arc, tiny as it was, so the voltage must have been up there. Of course, you probably don’t have to worry as your transmitter output is probably less than 60 or 70 milliwatts.
Oh, don’t check for that with your finger. RF burns smell funky.