[TowerTalk] Fwd: Peak Voltage at the tips of ants ?

[Larry Banks]

Good point Jim!   I wonder what the "ideal" characteristics of an 
antenna are that would radiate 100% of the energy near the earth?   Is 
this true in free space?

Larry / W1DYJ


On 10/4/2022 12:06, Lux, Jim wrote:
> On 10/4/22 9:04 AM, Larry Banks via TowerTalk wrote:
>> Theoretically infinite.  I = 0, therefore V = infinite with any power 
>> at the tip. 
>
> In theory (!) all the power would have been radiated by the time you 
> get to the tip - so zero voltage.
>
>
>> However the real case is very complex and depends on the environment 
>> and therefore the actual impedance at the tip caused by capacitive 
>> end effects, etc.   I don't believe there is a simple solution.
>>
>> Larry / W1DYJ
>> .
>>
>> On 10/4/2022 11:21, Pete Smith N4ZR wrote:
>>> I'd be interested in this.  I think the answer is fairly 
>>> straightforward, depending on how far the end is (electrically) from 
>>> the feedpoint, but specifics escape me.
>>>
>>> 73, Pete N4ZR
>>> Check out the new Reverse Beacon Network
>>> web server at<https://reversebeacon.net>.
>>> For spots, please use your favorite
>>> "retail" DX cluster.
>>>
>>> On 10/4/2022 11:07 AM, jim.thom jim.thom at telus.net wrote:
>>>> Ok, simple question.  With 1.5 kw (measured at feedpoint)  applied 
>>>> to the
>>>> 50 ohm input  of the (full sized) dipole / yagi... what is the PEAK 
>>>> V at
>>>> the tips ?   Assume 1:1 swr at the feedpoint.
>>>>
>>>> Same question, but ant is not full size, and may have various forms of
>>>> loading schemes used.  (Say 50-80%) of full size.
>>>>
>>>>
>>>> Ok, what about  a single, full size  1/4 wave vertical ? Or a loaded
>>>> vertical ?
>>>>
>>>>
>>>> I can't find a straight answer anywhere.
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