2 Meter Dipole and Antenna Wire Propagation

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K_8_b_y_p@IEEE.ORG
Half wave long wire absolutely would not match! And eliminating the thin wire link didnt change anything.
Did you catch that? The thin wire link which calculated, in ELECTRICAL TERMS, as 17 ohms or so HAD NO EFFECT. This demonstrates what modern antenna science knows, and that Ive proven here in two videos, ANTENNAS ARE NOT CIRCUITS (non- Fosters devices). See my video on Foster.
*ONLY QUARTER WAVE WIRE SEGMENTS WILL MATCH EFFICIENTLY! The forward and reflected waves MUST coincide exactly along the wire. If they dont, the emission will be weak, scattered and reflected power back down the line.
No longwires or 300 foot loops. Junk.
See my video on the Doublet Deception.
#ham #hamradio #antenna #arrl #hamantenna #dipole #swl #ieee #balun

Опубликовано:

10 сен 2024

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Комментарии : 13

@franzliszt3195 27 дней назад

Excellent

@k8byp 27 дней назад

There are no failed tests, just unexpected data collection....

@franzliszt3195 26 дней назад

Well the reactance of your 1.6 mm wire is 14.498655 at 144 MHz. But an inch of your larger rod, I guess at 5 mm, has a reactance of 9.250888. Not much difference. Apropos, I saw a video (which is one of my favorites) and the guy said, since such a thin part of the antenna is used (skin effect) any scratch or divit adds inductance; he polishes his antenna to mirror finish.

@k8byp 26 дней назад

Very Good! Yes, 9 ohms. Just goes to show that reactance didnt matter. When the link was removed nothing changed significantly. So him polishing his wire is a waste of time. Microwave, yes, HF, no. ieeexplore.ieee.org/abstract/document/833711 His ' thin part' idea is wrong, that's skin resistance not inductance. And it wont help. Dont suppose he actually proved his claim? Of course not. So he'd say my wire with a thick coating of corrosion wouldnt work at all,?🤣 Theres a lot of " rod polishers" in ham radio! 😆🤡 Its fun to take a little fact and make the rest up.

@Aimsport-video 27 дней назад

Very nice. Okay. So now experiment varying lengths of pole attached to shield vs center conductor. Notice bandwidth improvement if you’re doing it right.

@k8byp 27 дней назад

thats the current rabbit hole. theres a strange thing that happens at the feedpoint..

@Aimsport-video 27 дней назад

@@k8byp and the difference between the sheath leg and center characteristics is non-zero. I go long at an arbitrary frequency below what I eventually want and trim miniscule amounts off one leg and measure. Rinse and repeat making the other side slightly shorter. Eye opening.

@k8byp 27 дней назад

non zero, obviously but if expressed as capacitance, its essentially zero. Both 'wires' are part of the overall length of each arm, and errors in length can be interpreted as BW. BW as a function of sagging at feedpoint and as effective ' change in wire length' with frequency. This has become a real problem to separate the two out, I cant see any answer without TDR tests to see if its reflected at the feedpoint, or due to change in wire length. Thats mostly a question of connecting a $10000 TDR to an outdoor antenna without destroying it ftom static or lightning discharge. This is the question modern antenna research is hanging on.

@Aimsport-video 27 дней назад

@@k8byp great video btw. Reflection is guaranteed at any change of any type of the metal lattice, even inner “surface” of the edge of the lattice. Question is how much and how the heck does length of the pole AFTER reflection have different effect when connected to the shield vs center conductor. Something is happening in the place called “essentially zero” that matters.

@k8byp 27 дней назад

it matters but has basically no time in which to matter. V = 0.951c. How much time across 1 cm? Reflection in crystal lattuce, someone certainly has studied that. Heres where the wicket gets extremely sticky, there doesnt need to be electron movement thru the lattuce, it can be photon emission and reception. Heres a theory for you...charges ' inside ' the wire have nowhere to be emitted, if one flies off in some non ' forward' direction, its caught by another electron. They can go forward or somewhat sideways but with other charges ' pushing,' they cant go backward in large quantity. Only ' surface' charges can emit. Quantum propagation. This gets extremely messy...

@franzliszt3195 27 дней назад

'Quarter wave time long'. What do you mean by 'time'?

@k8byp 26 дней назад

watch my other antenna videos, thats been explained in detai.