[TenTec] Zepp

[Ken Brown]

By that definition, since they used the word "approximating" the length 
could vary over a very wide range, and still fit the definition.

When you make a dipole very short the radiation pattern does not change 
much at all. Additional lobes, that would make the pattern no longer 
approximate that of an elementary electric dipole, do not start to 
appear until the total length is at least 3/4 wavelength long. So it 
could be anywhere from perhaps 1/10th to 3/4 of a wavelength and still 
fit that definition. That pretty much discredits the notion that a 
dipole must be a half wavelength, or resonant, in order for it to be a 
dipole.

N6KB

On 9/16/2014 7:53 AM, Steve Hunt wrote:
> From IEEE Standard Definitions of Terms for Antennas:
>
> "2.102 dipole antenna. Any one of a class of antennas producing a 
> radiation pattern approximating that of an
> elementary electric dipole. Syn: doublet antenna.
> NOTE---Common usage considers the dipole antenna to be a metal 
> radiating structure that supports a line current distribution
> similar to that of a thin straight wire so energized that the current 
> has a node only at each end."
>
> Steve G3TXQ
>
>
> On 16/09/2014 05:43, Ken Brown wrote:
>> Any center fed straight wire is a dipole, regardless of how it's 
>> length compares the the wavelength you are using it on. If I build a 
>> dipole to be a half wavelength on 7 MHz, and then use it on 10.1 MHz 
>> it is still a dipole, just not a half wave dipole.
>>> I find it interesting to examine the dipole antenna. By definition 
>>> it is a wire length being equal to 1/2 the wavelength of the 
>>> frequency. The name comes from two terms "DI" meaning two and "POLE" 
>>> meaning electrical terminal having two distinct regions of 
>>> electrical polarity.
>>
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