[Antennas] resonance

Sat Dec 17 15:56:54 EST 2005

fkamp at comcast.net wrote:
> Bill Aycock wrote:
>>> My question is: What process are you using to determine that the 
>> impedance is purely resistive and at a value of 75 ohms?
>> Bill-W4BSG
>>> No process. I am blindly trusting what the antenna section of the 
> handbook tells me. The only thing I am wondering is if XL=XC as the 
> height of the dipole changes. Height evidently has a dramatic effect on 
> the feed point impedance value according to the chart. It was just not 
> clear how height effected the resonance condition if it was effected at 
> all.
>> Regards,
> Frank Kamp
>Indeed, the resonant frequency is affected by height. This is so because the lower the 
antenna the greater the capacitive coupling between the ends of the wire due to the change 
in the distance from the ground.
Harvey/W4TG
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