It's more interesting to know the value of the current flowing through the antenna.
The couple 'size of the antenna' (inductance value) and current gives enough parameters to determine the power emitted. You can compensate a small antenna with higher current to obtain same result.
There is others parameters who can increase or decrease the power emitted, but it is another story.
I'm using a 1.2mH inductor with 600 ohm serial resistor powered by 2V RMS.
This gives 3.33mA in 1.2mH inductor => 197µW.
The antenna is putted at 2 meters high. The house is not made with solid wall (placoplatre in French). I can feel the effect in all the room (about 12 meters around).
Like there is a difference between hearings persons speaking and understanding what they say, Schumann feeling in the last room is probably not the same that in the emitting room.
I have access to an inductance meter so I will check my magnetic coil as soon as I get it wound and see what it measures. Thanks for the information. I am surprised as I thought that much more voltage would be required to cover this area. What gage is the wire in your coil? I have been winding coils from an spool of 30 gage magnet wire. I will measure the DCR. I should think that as long as the oscillator is happy and the waveform is smooth and symmetrical that it should not matter much. So calculate the watts dissipated in the coil to get an idea of the area of transmission? Regards.
Hello.
For Eric: I confirm the 10 seconds latency to synch with the resonator wheh I power on, but when I power off it seems to me that I remain "phased" for more than 10 seconds.
For Moray: I'm out of home these days, when I'll turn back I'll send you the schematics.
I currently use an LM6172 dual opamp to generate a 4,5Vrms sine (about 40mA) feeding a 50mH air inductor; the resistive load is about 140ohm. It was not so easy to set the frequency to 7,83 due to the instability of the opamp-made oscillator.
Eric can calculate the radiated power as I don't know the formula.
Regards
For Eric: I confirm the 10 seconds latency to synch with the resonator wheh I power on, but when I power off it seems to me that I remain "phased" for more than 10 seconds.
For Moray: I'm out of home these days, when I'll turn back I'll send you the schematics.
I currently use an LM6172 dual opamp to generate a 4,5Vrms sine (about 40mA) feeding a 50mH air inductor; the resistive load is about 140ohm. It was not so easy to set the frequency to 7,83 due to the instability of the opamp-made oscillator.
Eric can calculate the radiated power as I don't know the formula.
Regards
As you can read in my first post here I used a 30awg enameled wire - very thin.
Regarding the emission I have to test it, but I think that the field decreases quickly.
One important thing: I take the coil in the vertical plane so I can see this big "O" just in front of me.
The other devices I know have an internal antenna placed in the horizontal plane, do you think I used it in a wrong way?
Regards
Regarding the emission I have to test it, but I think that the field decreases quickly.
One important thing: I take the coil in the vertical plane so I can see this big "O" just in front of me.
The other devices I know have an internal antenna placed in the horizontal plane, do you think I used it in a wrong way?
Regards
Well all of the commercial units I have seen that use bifilar flat coils have them in them positioned parallel to the ground but that does not mean much as it is the most practical way to orient them in a small box. I have not tried them in different positions much and I did not notice any difference when I did flip them around so I just left it as it came. From what I understand though the field squirts out from the narrow plane of a flat coil so you might want to try it parallel to the ground. The cylindrical coil that I just built has its core length parallel to the ground and it seems to work fine that way. I have to get the magnetic coil built soon and get this unit back to is owner though. Sorry I did not remember that you had used magnet wire, that's exactly what I used also 30 gage. Was your choice of series load resistor simply determined by what kept your oscillator happy? Thanks.
Someone told me yesterday that placing a strong magnet on the centre of a flat bifilar coil has some interesting effects on the coil. I am fresh out so perhaps some here might give this a try. I used up all my neo magnets building my last coil. I should think that this is exactly the same as having a high permeability core in a cylindrical coil so the inductance of the coil goes up this its would be the same as winding a larger coil. Ideally you would want the magnetic slug in the dead centre of the flat coil with the magnetic poles on either flat side of the slug at right angles to the coil plane.
First we have to test your psychological and cognitive literacy. This has been done, over thousands of posts. It has been found to be wanting, to the point that it intrudes in others lives in a manner that is socially and culturally unacceptable when it comes to a workable system of human social interaction.
As for the levels of intrusion and systematic derision of others on a continual level, with regard to this forum, you should not be allowed moderation capacities. You need to have your stripes ripped from your shoulders, son. Perhaps that would teach you a modicum of respect, but I seriously doubt it - As your history on this forum has so clearly shown.
As for Sy, Scott Wurcer, and others who may intrude here, go away, and don't come back. You seriously, in all ways, don't to have the right to run roughshod over threads like these.
If you want a better forum, that advances all aspects of audio and how humans integrate with this world and each other, then leave this thread and don't come back.
If you can't stop being a animalistic on the social level with regard to things you don't understand - then learn, at the least, to stay away. You'll be a better person for it.
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As to the subject at hand, Thank you gentlemen for your information on the resonators and coils. This information can be difficult to come by when it comes to the constructional basics. You have advanced my understandings of the direction one needs to move in, an a positive way.
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An intelligent man if there ever was one. As usual, multi-talented and musically inclined. Good on him. Feynman, IIRC, was a huge fan of music as well.
Within the realm of Man...There is nothing more honest than music, as the only thing that transgresses all possible dimensional considerations, is oscillating repetitive organized patterns of varying delta.
It is effectively - the only true constant.
That took longer than expected. The wind must have been blowing the smell of manure in the wrong direction.
The Islamic thinker Avicenna put forth the scientific method long before the west or Eurocentric interests did.
Thanks Scott I do agree with you because freedon of speech is fundamental to a free society. Making people feel small stupid or intimidated does not however help. Even seemingly stupid discussions can have value but if people are put off of entering a discussion out of fear then what just happened to free speech? Respect has to enter into the equation. Positive contributions are of value to everyone.
The price to pay for freedom is allowing others to have the same amount of freedom, and when interests collide you'll have to fight for your own freedom.
Respect (of others' religions, beliefs)(and as I understood it in the context of the above post) places limitation on freedom of speech while still allowing freedom of thought; if ones' thought happens to agree with anothers' then the restraint of opposing views need not be called into equation. Absolute freedom of speech is rarely practiced in reality.
Respect (of others' religions, beliefs)(and as I understood it in the context of the above post) places limitation on freedom of speech while still allowing freedom of thought; if ones' thought happens to agree with anothers' then the restraint of opposing views need not be called into equation. Absolute freedom of speech is rarely practiced in reality.
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