transmitter & coils

what is the relation between wave(radio) and coil? . how can meassure the distance and frequency of wave by coil? how uH depends upon the coil's turns,radious and diametre of coil?

Οι κυριότεροι παράγοντες που καθορίζουν την τιμή της αυτεπαγωγής ενός πηνίου είναι:
1.Ο αριθμός των σπειρών.
2.Ο τύπος και το σχήμα του πυρήνα.
3.Η διάμετρος και η διάταξη των σπειρών.
Μια προσεγγιστική τιμή της αυτεπαγωγής για τα πηνία δίνεται από τον τύπο: L=μ_r.Ν^2.Α/Ι
Όπου μ_r είναι η σχετική μαγνητική διαπερατότητα του πυρήνα, Ν ο αριθμός των σπειρών, Α η επιφάνεια μιας σπείρας και Ι το μήκος του πύρινα.


Έτσι υπολόγισα το πηνίο του κυκλώματος συντονισμού
I=7cm μήκος πυρίνος , N=100 σπείρες , Α=π*r^2 εμβαδών του πυρίνος, μ=12,6*〖10〗^(-7)1000 συντελεστής σιδήρου

L=μ*Ν^2*Α/l





2)Απλό δίπολο λ⁄2 του Hertz το μήκος του δίπολου υπολογίζεται από τον τύπο, L=142,5/f όπου f=MHZ και L=M.




3)H απόδοση μιας κεραίας εξαρτάται όπως ξέρουμε , από το ενεργό ύψος της h, και η ηλεκτρεγερτική δύναμη Ε που δημιουργείται σε αυτή από την ένταση f του πεδίου, είναι Ε=h*f . To ενεργό ύψος h του δίπολου λ/2 θα ήταν ίσο με το γεωμετρικό του ύψος, εάν η κατανομή του ρεύματος επάνω στο δίπολο ήταν ομοιόμορφη. Επειδή όμως παρουσιάζει κοιλία ρεύματος στο μέσο του και δεσμούς στα άκρα του ,το μήκος του είναι μικρότερο από το γεωμετρικό του ύψος. Το ενεργό ύψος του δίπολου δίνεται από τον τύπο.
h=2/π*λ/2

4) το c του πυκνωτή βγαίνει από τον τύπο f_0=1/(2*π*√(L*C)) , C=□( 1/(f_0^2*4*π^2*L) ⇒┴ )

Frequency of tuned circuit:

http://www.eeweb.com/toolbox/l-match
__________

And here is an inductance calculator:

http://www.eeweb.com/toolbox/wire-inductance
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For a mathematical treatment of these subjects:

http://en.wikipedia.org/wiki/Inductance
http://en.wikipedia.org/wiki/LC_circuit

Which very roughly translated from Greek to English because its all defiantly Greek to me

Is as follows for the benefit of those who cannot quite understand the comments In Greek even through we are speaking English , however the answer is quite good

Not to worry Thank God for

http://translation.babylon.com/greek/to-english/


My alien interpreter will be happy to answer any further questions you may have , "Spock to enterprise come in Kirk , Kirk I need some help with interpretation could you beam down for a quick moment please " beep beep

Zub, Zub, Zub, take me to you leader !!

The main factors that determine the value of a inductance coil is:
1: The number of turns
2: Shape of the and type of the coil
3: The diameter and the arrangement of whorls. "Its called worls in greek In english turns ", lets just hope they don’t start making coils out of chocolate or we might be experiencing some reception difficulties plus some weight problems

Not quite right there, still we at least have an answer

An approximate value of the inductance of the coils is given by the formula: L=μ_r.N 2.A/I where μ_r is the relative magnetic permeability of the core, N the number of turns, the surface of a spiral and I the length of the dive through rings. Thus calculated the coil resonance circuit I= 7cm length πυρίνος , N=100 coils , Α=π * r^ 2) supposes the πυρίνος, μ=12,6 * 〖10〗^ (-7)1000 rate iron

3:
Single dipole l⁄2 of the Hertz the length of the single dipole design for an extended reception is calculated by the formula, L=142.5 /f where f=MHZ and L=M.

4: The performance of an antenna depends on as we know, from the active amount of h, and the electromotive force E created from the intensity of the field f is Ε=h * f . The active height h of the single dipole design for an extended reception l/ 2); it would be equal to the geometric height, if the distribution of the current top of the dipole was uniform. However, because there is power in the middle abdomen (Duh Abdomen hes not on about vart power is he " , and ties on the ends of the ,the length is less than the geometric height. The active level of the single dipole design for an extended reception given by the formula; h=2/π * L/ 2);

Finally
The c of the capacitor is ejected " Its is ejected in this case , Yes Ejected fasten your saftey belts you are about to take off to Mars " , from the type f_0=1/(2 * W * √(L * C)) , C=□( 1/(f_0^2 * 4 * π^2 * L) ⇒┴ )

All good this All good definattley very challenging times

It does look as though its going to be a big badda boom especially in babylon watch out for the fith element Could be quite serious and its not all quiet on the northern front or the western front In fact they snowed under at the moment

So its calimity time yet again What a big huge surprise

This is nothing new anymore is this Still smile grin and contemplate suicide this may be the only way out

Either this or consult wih Brandson who might be able to arrange your trip to another planet

Coil produces electromagnetic wave when it is connected with a capacitor in parallel and shock exited using DC voltage. shock exciting is done using oscillator circuit. In oscillator circuit inductor and capacitor are shock excited continuously, so they starts charging and discharging producing electromagnetic wave across coil. frequency of charging and discharging is given by the formula. F= 1/(2 x 3.14 x Root of (Inductance x capacitance)). Where Capacitance is in farads, inductance in henneries and frequency in hertz (Wave).

Distance is nothing but wave length or distance travelled by a wave in 1 second time. wave length is given by formula = Speed of wave / frequency. speed of electromagnetic wave is 3 x 10000 0000 meters/second and frequency is in hertz or cycles per seconds. Distance or wave length you get is in meters.

Larger the diameter of coil larger is the inductance, larger the number of turns larger is the inductance. To find out coils dimensions and inductance in henry go to eeweb.com front page and click on tools then under tools menu click inductance of coil you will get all the details of coil design and inductance in henry, convert it to micro henry or as wish.