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.

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

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.

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

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

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.

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

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

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.

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.

Hey David,
I was trying to find my catalog from Amidon Associates (where I get my
toroids) before I opened my mouth and inserted foot and replied to your
quandry. In the brochure, they have a listing that tells how many turns
for each gauge wire on any given toroid size can be wound in a single
layer. Usually, I pick the largest wire that should fit based on the
number of turns I need. Right or wrong, that's how I do it. I couldn't
find it and I didn't see it on their website either. Anyhow, I assume
you are winding with enameled wire? Regarless, good luck with the
project and let us all know how it works out!

Scott
N0EDV


David Duxbury wrote:

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.




--
Scott
http://corbenflyer.tripod.com/
Building RV-4
Gotta Fly or Gonna Die

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.

Nobody has asked you, so I put in the question here.

Are you sure that you have the right toroid?
Maybe you have mixed them up, Maybe the kit is delivered with wrong toroid?

When Vectronic and the kit manual says that it could be done, maybe you are
lookoing in the wrong direction?


73 de Ben/SM0KBW