Charly wrote:

Dear all,

Usualy, people use 9:1 balun to connect a wire or dipole antenna to a 50 ohm coax.

If I use a basic TV coax (75 ohms) I suspect I will need a 6:1 balun instead. If
so, how many turns of wire should I use for primary and secondary windings ?

I don't know the impendance of the antenna connection of my radios (ATS 909 +
ICF SW100), so I intend to give a try with the coax I have in hand.

http://www.dxing.info/equipment/impe...ing_bryant.pdf

http://members.aol.com/DXerCapeCod/z_transformers.pdf

dxAce
Michigan
USA

dxAce wrote:

http://www.dxing.info/equipment/impe...ing_bryant.pdf

http://members.aol.com/DXerCapeCod/z_transformers.pdf

Good afternoon,

Yes, I have those one on my PC already... I think I have found most of the
articles dedicated on that topic.

But since I don't know exactly what is my toroïd material and constant values
for computation (I got my toroïd from a broken power supply) I was wondering
wether there was some "classical" windings spec...

Perhaps I will begin with a 1:1 balun (it should be the same number of turns for
both windings, right ?) and then start from that point to find a better
configuration.

Thanks anyway,

Charly

Charly wrote:

dxAce wrote:

http://www.dxing.info/equipment/impe...ing_bryant.pdf

http://members.aol.com/DXerCapeCod/z_transformers.pdf

Good afternoon,

Yes, I have those one on my PC already... I think I have found most of the
articles dedicated on that topic.

But since I don't know exactly what is my toroïd material and constant values
for computation (I got my toroïd from a broken power supply) I was wondering
wether there was some "classical" windings spec...

Perhaps I will begin with a 1:1 balun (it should be the same number of turns for
both windings, right ?) and then start from that point to find a better
configuration.

Best bet would be to start off with a proper toroid, not one you know nothing about.

dxAce
Michigan
USA

On Wed, 01 Mar 2006 18:44:49 +0100, Charly wrote:

dxAce wrote:

http://www.dxing.info/equipment/impe...ing_bryant.pdf

http://members.aol.com/DXerCapeCod/z_transformers.pdf

Good afternoon,

Yes, I have those one on my PC already... I think I have found most of the
articles dedicated on that topic.

But since I don't know exactly what is my toroïd material and constant values
for computation (I got my toroïd from a broken power supply) I was wondering
wether there was some "classical" windings spec...

Perhaps I will begin with a 1:1 balun (it should be the same number of turns for
both windings, right ?) and then start from that point to find a better
configuration.

Thanks anyway,

Charly

Why not just buy one of these and be done with it?

http://www.geocities.com/qrp_baluns/LMZ-50.html