Use is 80 to 10 meters.


"Roy Lewallen" wrote in message
...
"Optimum" depends on the frequency or frequencies of operation and on
the antenna system. What you need to do is go to the Micrometals web
site (Micrometals is probably the manufacturer of the core) and find the
inductance per turn squared of the core. Then you can calculate the
number of turns needed to get the required reactance at the operating
frequency. For nominally matched antennas, an impedance of 500 - 1000
ohms is generally adequate.

You might find you'll have trouble getting enough impedance at the lower
HF bands. Powdered iron is usually a poor choice for a balun core
because of its low impedance per turn squared. You might pass the self
resonant frequency by the time you get as much reactance as you want.
Ferrites such as type 43 are usually a much better choice -- you get
much more impedance, it stays relatively constant over a very wide
frequency range, and you'll be free of resonance effects.

Roy Lewallen, W7EL

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.

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

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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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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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.
|| |
|| |
|| |
|| |
|| |
|| |
||
||
||
||
|
|