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Building my QDX 3A as I write this -
I am building my QDX (Board 3A) right now. I am curious about toroid winding. Has anyone experienced trouble if one's toroid is "untidy", i.e. one or two loops are not tight to the ferrite? I assume that alters the impedance value to some degree. I am familiar with the theoretical answer - looking for someone who' found it does make a difference or that it does not.
What a great design and a fine kit this is - I successfully removed the 3A 'short' as instructed. The care it must take to package the kit with zero errors amazes me - the effort to get a 100% on package contents every time. As with all aspects of the design I am sure the 2N4401 was selected with great care but I wonder if anyone has tried a different transistor to alter the power out? Haven't even finished and considering experiments !!! |
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Cliff, the inductance of a toroid inductor is first and foremost affected by the number of turns. Next in importance is the spacing of the turns. And least affecting of the inductance value (almost none) is the tidiness of the windings (within limits). I’m sure yours are OK. Ron On Thu, Mar 23, 2023 at 05:46 Cliff Miller <cliff52@...> wrote: I am building my QDX (Board 3A) right now. I am curious about toroid winding. Has anyone experienced trouble if one's toroid is "untidy", i.e. one or two loops are not tight to the ferrite? I assume that alters the impedance value to some degree. I am familiar with the theoretical answer - looking for someone who' found it does make a difference or that it does not. |
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Thanks, Ron. I seem to remember something about how critical it is that the turns not cross one another while one being looser than another had very little effect.
While winding this morning I remember our old family doctor who had been a lineman on his college football team. He became a surgeon and did family practice because he enjoyed it. My daughter split a place open next to her eyebrow when just a child and my wife watched as those huge sausage fingers put in the finest tiny stitches you could imagine.- it healed with no scarring. I cannot wait to check out my work on the air - Cliff |
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Cliff
A while back, maybe a month ago, rough guess, there was a good discussion on simple helps to wind toroids neatly and tightly. As I recall one of the suggestions was to use a crochet hook in the center of the toroid to hold windings in place as you added the next one.
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73, Cliff, AE5ZA
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jjpurdum
Cliff: That works well on larger toroids, but I found it didn't help much on small toroids. Still, the cost is minimal so you may as well give it a go. Jack, W8TEE
On Thursday, March 23, 2023 at 12:41:02 PM EDT, Cliff <ae5zaham@...> wrote:
A while back, maybe a month ago, rough guess, there was a good discussion on simple helps to wind toroids neatly and tightly. As I recall one of the suggestions was to use a crochet hook in the center of the toroid to hold windings in place as you added the next one. 73, Cliff, AE5ZA
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Cliff
Understand, Jack. In that case just find something smaller in diameter. 73, Cliff, AE5ZA
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phil - wb4som
In the past I've used a modified clothes pin to clamp the turns in place while adding new ones. Also acts like a handle.
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