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.
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