[TowerTalk] current balun question

[Máximo EA1DDO_HK1H]

Hi Jim,


I've got a question about those baluns & chokes. Hopefully you can help me to see things clear.


If there is no perfect balanced antenna in this planet, let's say; a 50 OHm (inverted V) dipole with different currents on his arms.

What is the difference between to install a current choke or a 1:1 (dual toroid) Guanella balun at his feeding point?

Same question in a different way is; Is the current choke forcing to balance differential currents?


If I am not wrong, the 1:1 Guanella will balance differential currents, but will do a poor job on common mode.

Choke will (virtually) eliminate common mode currents, but won't balance differential currents.


Thank you very much


73, Maximo

________________________________
De: TowerTalk <towertalk-bounces at contesting.com> en nombre de Jim Brown <jim at audiosystemsgroup.com>
Enviado: sábado, 11 de marzo de 2017 5:53
Para: towertalk at contesting.com
Asunto: Re: [TowerTalk] current balun question

No -- the choke is in the common mode circuit, not the differential
circuit.

73, Jim K9YC

On Fri,3/10/2017 6:02 PM, Roger (K8RI) on TT wrote:
> Doesn't the added inductance of a choke that covers 80, or 40 also add
> more than just the length of the coax?


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