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Isotron160 coil and insulator.
 
THE BEST WAY TO OPERATE HF
 
EASY INSTALLATION
EXCELLENT PERFORMANCE
DURABLE CONSTRUCTION
CC&R FRIENDLY (XYL ALSO) 
 

PLEASE FORWARD THIS ARTICLE TO THOSE YOU FEEL WOULD BE INTERESTED. 

I have been publishing this technical article since January of 2013. For the past 44 years I have manufactured the Isotron Antennas. This also involved helping many with their very difficult installations. Some of the information will be from what we learned solve these problems. Some information will be right from a text book or credible article.

You are welcome to contact me at

wd0eja@isotronantennas.com with questions you may have.
WHAT IS IN A CAPACITOR ? - PART 1
 
Capacitance, of course. What does that mean?
 
Suppose two flat metal plates are placed close to each other (but not touching) and are connected to a battery through a switch. At the instant the switch is closed, electrons will be attracted from the + plate to the + side of the battery. The same number of electrons will be repelled into the - plate from the - side of the battery terminal. Enough electrons move into one plate and out of the other to make the emf between them the same as the emf (voltage) of the battery.
 
If the switch is opened after the plates have been charged in this way, the + plate is left with a deficiency of electrons and the -plate with an excess. The plates remain charged despite the fact the battery no longer is connected. However, if a wire is touched between the two plates (shorting them) the excess electrons on the - plate will flow through the wire to the + plate, thus restoring electrical neutrality. The plates have been discharged.
 
The two plates constitute an electrical "capacitor"; a capacitor possesses the property of storing electricity. (The energy is actually stored in the electric field between the plates.) During the time the electrons are moving, that is, while the capacitor is being charged or discharged, a current is flowing in the circuit even though the circuit is broken by the gap between the plates. However, the current flows only during the time of charge and discharge, the time is usually very short. there can be no continuous flow of direct current "through" a capacitor, but an alternating current can pass through easily if the frequency is high enough.
 
The charge or quantity of electricity that can be placed on a capacitor is proportional to the applied voltage and to the capacitance of the capacitor. The larger the plate area and smaller the spacing between the plate the greater the capacitance. The capacitance also depends upon the kind of insulating material between the plates; it is smallest with air insulation, but substitution of other insulating materials for air may increase the capacitance many times. The ratio of capacitance with some material other than air between the plates, to the capacitance of the same capacitor with air insulation, is called the "dielectric constant" of that particular insulating material. The material itself is called a "dielectric". As an example, if a sheet of polystyrene is substituted for air between the plates of a capacitor, the capacitance will be increased 2.6 times.
 
A future article will go into more detail about capacitors.
 
73,
Ralph WD0EJA
 
09-16
BILAL COMPANY
137 MANCHESTER DR.
FLORISSANT, CO. 80816 U.S.A
PH/FX: 719/687-0650
 
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