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#1
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Toriod winding
Good day I am putting together a Vectronics 80 Meter Transceiver Kit
, the problem I have is winding the T50-2 toroid , the instructions state to wind 40 turns of 24 gauge wire, would that be two passes of twenty as forty on a single pass is nigh impossible. Help would be appreciated. |
#2
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Remember, each time the wire passes through the core is counted as a
turn. In other words, just passing the wire straight through the core is one turn. 24 gauge wire should be fairly easy to get 40 turns in a single pass. Toroids are usually wound about 330 degrees around (a 30 degree gap between start and end of winding)... Scott David Duxbury wrote: Good day I am putting together a Vectronics 80 Meter Transceiver Kit , the problem I have is winding the T50-2 toroid , the instructions state to wind 40 turns of 24 gauge wire, would that be two passes of twenty as forty on a single pass is nigh impossible. Help would be appreciated. -- Scott http://corbenflyer.tripod.com/ Building RV-4 Gotta Fly or Gonna Die |
#3
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Hi Scott I have tried and no way can i get 40 turns in without
overlapping, also is it correct to wind on only 80 percent of the core Scott wrote: Remember, each time the wire passes through the core is counted as a turn. In other words, just passing the wire straight through the core is one turn. 24 gauge wire should be fairly easy to get 40 turns in a single pass. Toroids are usually wound about 330 degrees around (a 30 degree gap between start and end of winding)... Scott David Duxbury wrote: Good day I am putting together a Vectronics 80 Meter Transceiver Kit , the problem I have is winding the T50-2 toroid , the instructions state to wind 40 turns of 24 gauge wire, would that be two passes of twenty as forty on a single pass is nigh impossible. Help would be appreciated. |
#4
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Good day I am putting together a Vectronics 80 Meter Transceiver Kit , the problem I have is winding the T50-2 toroid , the instructions state to wind 40 turns of 24 gauge wire, would that be two passes of twenty as forty on a single pass is nigh impossible. Help would be appreciated. Bad Instructions! You can't get 40 turns of 24 on a T50 core in a single layer. Go to #26 or even 28. It won't change the inductance appreciably for the same number of turns, and you can space it properly. Given just the number of turns, you probably won't be within 10 percent of the desired inductance anyway. W4ZCB |
#5
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David Duxbury wrote:
Scott wrote: Remember, each time the wire passes through the core is counted as a turn. In other words, just passing the wire straight through the core is one turn. 24 gauge wire should be fairly easy to get 40 turns in a single pass. Toroids are usually wound about 330 degrees around (a 30 degree gap between start and end of winding)... Hi Scott I have tried and no way can i get 40 turns in without overlapping, also is it correct to wind on only 80 percent of the core If you have to overlap turns, overlap adjacent ones, rather than go with two layers. this lowers the additional inter winding capacitance. In effect, you get a single layer on the outside of the core and a double layer on the inside. Have you used the trick of making a bobbin out of a plastic straw or wood splint and notched the ends so wire can be wrapped over the ends? It makes it very much easier to pass a length of wire through the hole, lots of times, without dragging the whole length through for each turn. You can also tack each turn down on the outside corners of the core with a little drop of instant glue, but you have to be really careful to not glue your fingers to the inductor. -- John Popelish |
#6
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On Fri, 17 Sep 2004 01:58:12 GMT, "Harold E. Johnson"
wrote: Bad Instructions! You can't get 40 turns of 24 on a T50 core in a single layer. Go to #26 or even 28. It won't change the inductance appreciably for the same number of turns, and you can space it properly. Given just the number of turns, you probably won't be within 10 percent of the desired inductance anyway. Way to go, Harold! -- "What is now proved was once only imagin'd." - William Blake, 1793. |
#7
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John Popelish wrote:
You can also tack each turn down on the outside corners of the core with a little drop of instant glue, but you have to be really careful to not glue your fingers to the inductor. Is that from experience? But seriously, I normally tack thing down with a bit of hot glue and it does come off easily so mistakes aren't much of a concern. -- Wing Fong Wong. Webpage: http://wing.ucc.asn.au |
#8
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Wing wrote:
John Popelish wrote: You can also tack each turn down on the outside corners of the core with a little drop of instant glue, but you have to be really careful to not glue your fingers to the inductor. Is that from experience? But seriously, I normally tack thing down with a bit of hot glue and it does come off easily so mistakes aren't much of a concern. I used to use instant glue a lot, fogging it with my breath, to harden it very quickly. But I inhaled too much of the fumes and damaged my lungs, so hardly ever use it, any more. THe hot melt glue idea sounds interesting. Especially with the ability to peel the whole mess off when the coil is done. -- John Popelish |
#9
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Hi again Guys I phoned the Vectronics people all I got from them was
yes you can wind forty turns onto the core, I say Bull.... I read in the same instructions to wind on only 80 percentof the core, now I am a real quandary? I am new to this but I hope not stupid, help please Dave. David Duxbury wrote: Good day I am putting together a Vectronics 80 Meter Transceiver Kit , the problem I have is winding the T50-2 toroid , the instructions state to wind 40 turns of 24 gauge wire, would that be two passes of twenty as forty on a single pass is nigh impossible. Help would be appreciated. |
#10
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I wouldn't fret too much about it. Just reduce the wire size to the
point where you can easily get it all on one layer (as others have suggested), and it'll be fine. The fact is that the cores themselves vary quite a bit from one to another, and normal variations in winding technique increase the variability, so any good design either doesn't need for the finished inductor to be a precise value (that is, it's in a relatively low Q circuit), or it has some means (such as a variable capacitor) of adjusting to compensate for variations. In short, it shouldn't really be that critical. Roy Lewallen, W7EL David Duxbury wrote: Hi again Guys I phoned the Vectronics people all I got from them was yes you can wind forty turns onto the core, I say Bull.... I read in the same instructions to wind on only 80 percentof the core, now I am a real quandary? I am new to this but I hope not stupid, help please Dave. David Duxbury wrote: Good day I am putting together a Vectronics 80 Meter Transceiver Kit , the problem I have is winding the T50-2 toroid , the instructions state to wind 40 turns of 24 gauge wire, would that be two passes of twenty as forty on a single pass is nigh impossible. Help would be appreciated. |
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