Re: [TowerTalk] Subject: Re: Managing Balanced line transitions

["Cecil Moore" <w5dxp@hotmail.com>]

> From: "Cecil Moore" <w5dxp@hotmail.com>
> Subject: Re: [TowerTalk] Subject: Re: Managing Balanced line transitions 
> through the core".
> Consider two wires passing through a ferrite core. If they carry ideal 
> balanced currents,
> one current will induce a field in the core and the other current will 
> induce a field in
> the core that is 180 degrees out of phase with the first one. Thus, zero 
> flux will exist
> in that core under ideal conditions.

I wasn't very clear here. The only argument I am presenting is whether to 
install a 1:1 current-choke-balun at a balanced to unbalanced junction where 
the impedance is unknown and the amount of unbalance is unknown. It is not 
only good engineering practice to install the 1:1 current-choke-balun but 
also to choose a design where the differential transmission line currents do 
not induce appreciable flux in the ferrite. A 1:1 current-choke-balun can 
indeed simultaneously perform the choking function and the balun function. 
That's how a W2DU balun works and W8JI recommends 1:1 current-choke-baluns 
in applications where the impedances are unknown.
--
73, Cecil, w5dxp.com

_________________________________________________________________
Valentine?s Day -- Shop for gifts that spell L-O-V-E at MSN Shopping 
http://shopping.msn.com/content/shp/?ctId=8323,ptnrid=37,ptnrdata=24095&tcode=wlmtagline

_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk