4 T106-2 Toroid Iron Powder Core Made in The USA

often trans-matches, baluns and other impedance matching devices for random length end fed antennas or end fed half wave antennas. With the right size, you can make up any inductance coil value to make a trapped antenna too

Made a 49:1 and a 9:1 UnUn and both work fine at QRP levels.

Used these for making a matching transformer (4:1 unun) for a home-made mobile screwdriver HF antenna for ham radio, and for a choke on the power leads to the motor inside the antenna.

bought to make baluns,

I must have pushed the wrong choice as these were not what I thought i was ordering. Although they are a little smaller I wrapped the wire on them and the Balun works great.

These look great and so far work fine. More testing underway.

Wanted several low power 9:1 Ununs and have wound one so far. Ready to wind another. Works well for this purpose.

Great size for QRP work.