BEC Posted December 23, 2005 Share Posted December 23, 2005 5 pieces of 16 AWG copper hook-up wire inside the coil. No effect. Bob Crites Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted December 23, 2005 Share Posted December 23, 2005 Bob, I just did the experiment with the paper clip. It's definitely the materal, not the conduction around the loop that counts. I was able to find a hunk of stainless steel to try and it doesn't make any difference just like you said. I also tried a loop of the ground braid wraped around the outside of a 128 uH litz inductor. At 1 Khz it dropes to 126 mHy. at 10Khz it drops to 97.9 uHy. At 100 Khz it's down to 91 uHy. Will your little B&K meter go up to 10 Khz?Al K. Quote Link to comment Share on other sites More sharing options...
BEC Posted December 23, 2005 Share Posted December 23, 2005 Al, Yes, it will measure at 10 Khz. Bob Quote Link to comment Share on other sites More sharing options...
Deang Posted December 23, 2005 Share Posted December 23, 2005 So do I move the coil or don't I? Inductance is stable and uneffected -- but just so I understand correctly -- is Q dropping or staying the same? Quote Link to comment Share on other sites More sharing options...
BEC Posted December 23, 2005 Share Posted December 23, 2005 Dean, If it were this coil, I would say it would be fine in contact with the cap. I suspect that would apply to yours also, but I don't have one to test. Bob Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted December 23, 2005 Share Posted December 23, 2005 Dean, The inductor in Bob's 500air8 picture is edge-wise to the cap. The way you have yours setting is rotated 90 degrees such that the magnetic field has to go right into the cap. I think If I were you I would move the coil. I think one thing that is certain, air is the best best core material! Moving it away from the cap will make the entire discussion a moot point! Al K. Quote Link to comment Share on other sites More sharing options...
Deang Posted December 23, 2005 Share Posted December 23, 2005 But it's such an interesting discussion don't you think? "Air" core as opposed to being filled with a ferrous material -- I'd like see what Q does if you stuff the center of the coil with a piece of wood. Seems hard to believe there would be any effect -- even thought the air has been displaced. Quote Link to comment Share on other sites More sharing options...
BEC Posted December 23, 2005 Share Posted December 23, 2005 OK, I'll try most anything. Stuffed a carpenters pencil in it. No effect even with the graphite inside it. Bob Quote Link to comment Share on other sites More sharing options...
BEC Posted December 23, 2005 Share Posted December 23, 2005 Dean, To anticipate your next question, no, a Tootsie Roll does not effect it either. Bob Quote Link to comment Share on other sites More sharing options...
Deang Posted December 23, 2005 Share Posted December 23, 2005 Bob, what does the bottom number in the display represent? How about pizza dough, what does it do? Quote Link to comment Share on other sites More sharing options...
BEC Posted December 23, 2005 Share Posted December 23, 2005 Dean, I believe that display was set on "Q" at 1 khz when I measured that inductor. Bob Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted December 23, 2005 Share Posted December 23, 2005 Shucks, I would have thought the tootsie roll would make test a lot sweeter! Al K. Quote Link to comment Share on other sites More sharing options...
BEC Posted December 23, 2005 Share Posted December 23, 2005 I hope you got all the data you needed from the Tootsie Roll test. I ate the test subject and don't have another one. Bob Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted December 23, 2005 Share Posted December 23, 2005 Dean, Your wish is my command! Air core: L=128.4 uHy Q=5.86 (1Khz) 7 ferrite balun cores: L=173.4 uHy Q=7.94 Al K. Quote Link to comment Share on other sites More sharing options...
BEC Posted December 23, 2005 Share Posted December 23, 2005 Dean said: "How about pizza dough, what does it do?:)" Now thats just silly. Let's stay practical with Tootsie Rolls and carpenter pencils. Bob Quote Link to comment Share on other sites More sharing options...
3dzapper Posted December 23, 2005 Share Posted December 23, 2005 Dean, You should you test one with seven .45ACPs through it. Now that would be more fun than a Tootsie Roll. Rick Quote Link to comment Share on other sites More sharing options...
BEC Posted December 23, 2005 Share Posted December 23, 2005 Rick, Excellent idea. All I have handy is some Winchester 30-30. Very little effect. Bob Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted December 24, 2005 Share Posted December 24, 2005 HEY! Now there's the ultimate tweeter protection scheme. To much energy to the inductor fires the bullet and kills the listener. [6] Al K. Quote Link to comment Share on other sites More sharing options...
JJkizak Posted December 24, 2005 Share Posted December 24, 2005 Then you could call it a "deductor". JJK Quote Link to comment Share on other sites More sharing options...
Deang Posted December 24, 2005 Share Posted December 24, 2005 Hee hee -- that's pretty good.[] Quote Link to comment Share on other sites More sharing options...
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