[SADXA] Output Impedance of Baluns

[Wes Stewart]

Bill,

Where did you get these data?

Wes

On 12/21/2018 12:50 AM, W7EXG (Bill) wrote:
> These comments were made by Bill Davis W7EXG at the 12-20-18 SADXA meeting.
>
>
> OUTPUT impedance of Baluns is not alike.
>
> For example, the output impedance of a 1:1 Balun [from Balun Design], is
> Inductive with input terminated on 50 or 75 ohms.
>
> The output impedance of a 1.5:1 balun (75/50 ohm Balun) (from Balun Design)
> is capacitive with input terminated on 50 ohms.
>
> Thus, for a fixed rotatable dipole element length, the resonant frequency of
> the dipole using a 1:1 Balun (75 ohm Coax) will be substantially different
> than for this same dipole element length with the 75/50 ohm balun (50 ohm
> Coax).
>
> BOTTOM LINE: Output impedance of Baluns is important, yet this important
> characteristic is typically not specified.
>
> 73's
> Bill W7EXG