Fred W4JLE wrote:

Use is 80 to 10 meters.

In that case I'd seriously recommend using ferrite rather than the
powdered iron core. Type 43 or one of the 70 series would be best.
Around ten turns on a fair sized core would be in the ballpark, but you
could get more detailed information from the web site of the ferrite
manufacturer.

Roy Lewallen, W7EL

It is to be used in a transmission line. I need to cover 10-80 meters. The
core has m=10 and uH per hundred turns of 218.

"Reg Edwards" wrote in message
...


Using a T200A-2 for a 1:1 balun, what is the optimum number of turns
and
best wire size? 200 watts max power.


What sort of circuit is it in?
Between what things is it to be used?
What frequency range?
We are not mind readers!

Without further information try 12 turns of Radio Shack, 18 or
16-gauge, twin, stranded, speaker wire. It might work.

But all I have is a couple of t200a cores.

"Cecil Moore" wrote in message
...
Fred W4JLE wrote:
Using a T200A-2 for a 1:1 balun, what is the optimum number of turns and
best wire size? 200 watts max power.

#2 material is a good choice for inductors, not so good a choice
for a balun. I bought a commercial balun made from #2 material.
It did not perform well over all of HF. #2 is powdered iron.
Suggest a ferrite like FT-240-61 or a W2DU style choke.
--
73, Cecil http://www.qsl.net/w5dxp

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Fred W4JLE wrote:
But all I have is a couple of t200a cores.

With two of them, you might be able to wind one for 80m-30m
and the other for 20m-10m. Bit if I were you, I'd order the
Amidon AB-240 balun kit for $9.

http://www.amidoncorp.com/aai_cost_experimenter.htm
--
73, Cecil http://www.qsl.net/w5dxp

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I don't have $9.00, still need to use what I have.

"Cecil Moore" wrote in message
...
Fred W4JLE wrote:
But all I have is a couple of t200a cores.

With two of them, you might be able to wind one for 80m-30m
and the other for 20m-10m. Bit if I were you, I'd order the
Amidon AB-240 balun kit for $9.

http://www.amidoncorp.com/aai_cost_experimenter.htm
--
73, Cecil http://www.qsl.net/w5dxp

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Approximately 12 turns of 18 gauge speaker wire on a 2" diameter
ferrite ring will do the job.

Ferrite material with Mu = 200 to 500, ordinary LF to HF grade will be
OK.

If Mu = 10 then the core material is iron dust. Permeability is much
too low. Many turns would be needed to obtain sufficient inductance
at 80m. Too many turns prevent correct operation at 20 and 10m. And
the wire would be too thin for operation at 200 watts.
----
Reg, G4FGQ.

========================================

"Fred W4JLE" wrote in message
...

It is to be used in a transmission line. I need to cover 10-80
meters. The
core has m=10 and uH per hundred turns of 218.

"Reg Edwards" wrote in message
...


Using a T200A-2 for a 1:1 balun, what is the optimum number of
turns
and
best wire size? 200 watts max power.


What sort of circuit is it in?
Between what things is it to be used?
What frequency range?
We are not mind readers!

Without further information try 12 turns of Radio Shack, 18 or
16-gauge, twin, stranded, speaker wire. It might work.

I found this page of interest, mainly because he speaks (mentions) of the
EXACT core you wish to use...
http://www.rason.org/Projects/balun/balun.htm

Warmest regards,
John

"Fred W4JLE" wrote in message
...
|
| Using a T200A-2 for a 1:1 balun, what is the optimum number of turns and
| best wire size? 200 watts max power.
|
|
|
|
|
|

Yes, but this page shows a 4:1 balun, I need a 1:1

"John Smith" wrote in message
...
I found this page of interest, mainly because he speaks (mentions) of the
EXACT core you wish to use...
http://www.rason.org/Projects/balun/balun.htm

Warmest regards,
John

"Fred W4JLE" wrote in message
...
|
| Using a T200A-2 for a 1:1 balun, what is the optimum number of turns and
| best wire size? 200 watts max power.
|
|
|
|
|
|

Well, going by his figures, two windings of 13 turns each, hooked as a
1:1....
I forgot if you were going Balun or UnUn, if Balun, it would be a trifilimar
hooked as a voltage balun, correct?
And, that is assuming if what I present is correct--by what I have "thought"
I have leaned (picked-up)...

Regards,
John

"Fred W4JLE" wrote in message
...
| Yes, but this page shows a 4:1 balun, I need a 1:1
|
| "John Smith" wrote in message
| ...
| I found this page of interest, mainly because he speaks (mentions) of
the
| EXACT core you wish to use...
| http://www.rason.org/Projects/balun/balun.htm
|
| Warmest regards,
| John
|
| "Fred W4JLE" wrote in message
| ...
| |
| | Using a T200A-2 for a 1:1 balun, what is the optimum number of turns
and
| | best wire size? 200 watts max power.
| |
| |
| |
| |
| |
| |
|
|
|
|

Errr, and that is assuming (yes, I know, I keep making that mistake) that
the two turn winding (bifilar winding) is used in a “phase reversal”
configuration… for unbalanced-to-unbalanced 1:1 effect…. and, I think this
qualifies as a "current balun."



Why the trifilar winding becomes a "voltage balun" is a concept still
escaping me...

I am working on that, for anyone who would like to explain?



Warmest regards,

John



"John Smith" wrote in message
...
| Well, going by his figures, two windings of 13 turns each, hooked as a
| 1:1....
| I forgot if you were going Balun or UnUn, if Balun, it would be a
trifilimar
| hooked as a voltage balun, correct?
| And, that is assuming if what I present is correct--by what I have
"thought"
| I have leaned (picked-up)...
|
| Regards,
| John
|
| "Fred W4JLE" wrote in message
| ...
|| Yes, but this page shows a 4:1 balun, I need a 1:1
||
|| "John Smith" wrote in message
|| ...
|| I found this page of interest, mainly because he speaks (mentions) of
| the
|| EXACT core you wish to use...
|| http://www.rason.org/Projects/balun/balun.htm
||
|| Warmest regards,
|| John
||
|| "Fred W4JLE" wrote in message
|| ...
|| |
|| | Using a T200A-2 for a 1:1 balun, what is the optimum number of turns
| and
|| | best wire size? 200 watts max power.
|| |
|| |
|| |
|| |
|| |
|| |
||
||
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