[TowerTalk] 160M vertical dipole ?

[Lux, Jim]

On 1/23/22 3:23 PM, Richard (Rick) Karlquist wrote:
>
>
> On 1/23/2022 11:00 AM, Lux, Jim wrote:
>
>>
>> What's interesting is that the directivity of a infinitely short 
>> dipole is 1.5 dBi, and a full size half wave is 2.15 dBi.  So a 
>> shortened dipole with capacity hats, loading coils, or matching 
>> network will be pretty much the same (within a 1/2 dB) as far as the 
>> far field goes for the same center height.
>>
>
> Correction: the gain of an infinitely short dipole is actually
> 10 LOG 1.5 = 1.76 dBi, so there is even less difference than you implied.
>
> 73
> Rick N6RK
>
You're right.. 1.5 is the numerical gain.

The pattern of a infinitesimal dipole just isn't much different from a 
longer one. It's the feedpoint impedance that's "challenging" for the 
tiny dipole.