Hi Joe
Well, typically a dipole at resonance is near 70 Ohms (Resistive), and needs help in some form to get to 50 Ohms.
Making the dipole longer, or shorter, Is moving around those complex impedances.?
So the idea is to experimentally find a length where the Resistive and Complex combine to 50 Ohms or so.? Anything to make that SWR Meter happy!?
The classic figure '8' pattern stays the same from near zero length to about 3/4th wavelength where it starts to become a 4 leaf clover pattern.?? Between near zero and about 3/4ths wave the field strength will vary, but not the '8' pattern.
?Kent
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On Wednesday, July 27, 2022 at 05:31:43 AM CDT, Joe <k1ike_mail@...> wrote:
On 7/26/2022 9:05 PM, Jim Lux wrote:
But yeah, if you're throwing a dipole for 40m up in a tree,
measurement to the nearest inch/cm is probably good enough.
This brings me to a thought that I have had for many years.? Just to nit
pick a bit more for science, I hear people say that they "cut the dipole
to 50 ohm resonance" when in actuality I believe that they are cutting
the dipole to an impedance match.? I've never taken the time to model
the antenna in software (on my bucket list to learn this skill) but I
really wonder what that does to the radiation pattern.? Probably
insignificant on HF frequencies but it would be interesting to put a
measurement on the difference.
73, Joe, K1ike
