What is Resonance? (
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- Опубликовано: 5 фев 2025
- Steve, KL3EZ, has been trying to understand resonance better to help teach some new techicians but he is also having some trouble understanding the full concept.
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A nice refresher. This video really "resonates" with me.
Dave - Your ability to explain electorics principles is second to none! I also love how you appreciate the wonders of our natural world.
When my Father worked for Lockheed (radar engineer) he used tuning forks quite extensively for circuit tuning and had quite a collection of them.
This was a great video more info than I was able to own in one viewing. I will watch this video several time will I get comfortable in the knowledge. Thank you.
Dave, that was an excellent and very interesting discussion of resonance, especially your pointing out the theoretical as well as practical existence of "negative frequency."
Ok so Dave... Is Radiation Resistance of an antenna ALSO for just ONE FREQUENCY? I suspect it varies as you get further away from the Natural Frequency of Resonance? Yes?? Art W1SWL
I had a long online conversation about a tuned aerial must be resonant to be called tuned.
I also gave the point you make about one frequency and would he not move away from that one frequency as it's no longer resonant. He seemed obsessed about it must be resonant. He didn't answer.
Most amateurs and c.b.'ers call it tuned by obtaining a low swr. Not resonant I agree. I tried for two days to get a 6m dipole resonant, 73 Ohms and zero reactance. I couldn't. You are lucky to get the textbook ideal tuned resonant aerial, out in the clear and right height above ground. I can't do it.
G4GHB.
Brilliant summary. Thank you.
The online falstad circuit simulator can show what is happening electrically for those curious, the RLC circuit is the default circuit the page loads.
I have just been fitted with a pacemaker and I have been informed that I must not get within 9ft of an armature transceiver!!! I have tried contacting the makers of the pacemaker with no luck at all. I have spoken to the surgical team that fitted the pacemaker and they didn't know ether. I just haven't any luck finding out at all. 73 Dave Morgan MW0MDV
Good One, Dave.
Most amateurs and c.b.'ers say an aerial is tuned by obtaining a low swr.
They, and I, don't care if it's resonant or not. Nice if you can get it.
For two days I tried to get a 6m indoor dipole resonant, using larger diameter wire, altering the length, raise/lower the centre. I couldn't do it. What else could I try apart from putting it outside in the clear and at the right height.? Is mine usable? Of course it is. A real dipole in a real world situation. A low swr will do for me, the transmitter is happy.
20m, 17m, 15m and 10m attic dipoles not resonant but work fine, low swr.
I got told impedance is important causing overheating and blowing the p.a. In four years I've had no problems.
G4GHB.
awesome
You explained why the tuning fork is resonant... spring [capacitance] and mass [inductance.] You did not explain why the circuit is resonant. Is it because of the charging/discharging of the capacitor [spring] and the building/collapse of the magnetic field in the inductor [mass] that causes the resonance?
He really does not understand what is happening, so sad, like many, he relies on math but does not understand the "how".
Have a look on Wikipedia at The Thing (listening device)
Hmm..., not finding it.
Good video. But for those of us that can't handle the math, skip ahead to 16:38.
Tuning fork was uncooperative 🤛🏼
To much tuning fork
math was not your best subject
Why do you say that? He's got a degree in Mathematics.
At 73 years old I find that my natural frequency is getting slower as the years go by. I have a tuning fork and when I hit it on top of my head I get cross eyed. Sorry I am in a mood. de WB7ORB
Thank you. N0QFT