Yvson:

See if any of the following links are helpful to you:
http://www.arising.com.au/people/Hol...ph/CMBalun.htm

http://www.arising.com.au/people/Hol...h/CM4Balun.htm

http://www.catchnet.com.au/~rjandusi...n_winding.html

http://webpages.charter.net/aa5tb/balun.html

http://www.smeter.net/feeding/balchoke.php



Warmest regards,

John



"Yvson" wrote in message
om...
| Hi! I'm building a homebrew T antenna tuner and would like to make the
| 4:1 balun for it. As I live in Brazil (northeastern and the poorest
| part of the country) it is very difficult to find ferrite cores in my
| city, i would like to make it with ferrite rods from MW radios. I have
| three ferrite rods with diameter of 3/8 inchs and lenght of 4 inchs.
|
| I know it is possible to use them to make the Balun, but I would like
| to make one that can hold the maximum of 100 to 150W (it's for my
| Yaesu FT757GX use).
|
| Does anyone have any project? I have small experience in electronics,
| so I would like detailed instructions to not make any mistake.
|
| 73,
|
| Yvson - PR7BOK