[Elecraft] I love toroids

[Jeremiah McCarthy]

While we are on the subject of toroids, I would like to point out something I have encountered while up-grading pre-built K2's... Toroids can be wound backwards, and when this is done to vertically mounted toroids, the wire leads, as they exit the center of the core, are on the wrong side of the toroid...The "fix" is to pass the wire under the core to the other side so it reaches the solder pad...This adds another turn to the toroid, 1/2 a turn at each end...Also, the toroid is not secure and is free to move around which might result in wire fatigue, especially in a portable, mobile, or back-packing environment where vibration is present...

One of the radios I up-graded had evidently been dropped and landed upside down...The miswound toroids were standing up off the board by about 1/2 inch and had rotated 1/2 turn because the wires were pulled taut by the G force...

If a toroid has been wound backwards, it is best to strip it and rewind it correctly...

Jerry, wa2dkg