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Updated: July 8, 2025
This is called a fixed, or stationary spark gap and costs about $1.00. The Tuning Coil. The transmitting inductance, or sending tuning coil, consists of 20 to 30 turns of No. 8 or 9 hard drawn copper wire wound on a slotted insulated form and mounted on a wooden base.
When he concluded his relation, the knight leaned back and gazed at him with an affectionate squint. "See, now, bully rook, if I take you," he said. "It behooves you to have fair inductance at court. For this ye come to Sir Percevall Hart, her Majesty's harbinger and though he says so himself a good friend to Cecil. Now, mark me, lad.
It is with the tuning coil that you tune in and tune out different stations and this you do by sliding the contacts to and fro over the turns of wire; in this way you vary the inductance and capacitance, that is, the constants of the receiving circuits and so make them receive electric waves, that is, wireless waves, of different lengths. The Double Slide Tuning Coil.
But when the positive half of an alternating current is made to flow through a large inductance it acts like a large resistance as before and likewise smooths out the current, but none of its energy is wasted in heat and so a coil having a large inductance, which is called an inductive reactance, or just reactor for short, is used to smooth out, or filter, the alternating current after it has been changed into a pulsating direct current by the rectifier tubes.
The other connections are exactly the same as shown in Figs. 44 and 45. An Intermediate Wave Set With Variocoupler Inductance Coils. By using the coil wound on the rotor of the variocoupler as the tickler the coupling between the detector tube circuits and the aerial wire system increases as the set is tuned for greater wave lengths.
If you are using a condenser having a capacitance of .007 microfarad, which is the largest capacity value that the Government will allow an amateur to use, then if you have a hot wire ammeter in your aerial and tune the inductance coil or coils until the ammeter shows the largest amount of energy flowing through it you will know that your transmitter is tuned and that the aerial is sending out waves whose length is 200 meters.
They have a capacitance of 1 mfd. and will stand 750 volts. These condensers cost about $2.00 each. The Filter Reactance Coil. It consists of a coil of wire wound on a soft iron core and has a large inductance, hence the capacitance of the filter condensers are proportionately smaller than where a small inductance is used which has been the general practice.
Connect a wire to the ground wire between the bank-wound inductance coil and the ground proper, i.e., the radiator or water pipe, connect the other end of this to the + electrode of the A battery and connect this end also to one of the terminals of the filament.
Since the farad is far too large for practical purposes a millionth of a farad, or microfarad, whose symbol is mfd., is used. What Inductance Is.
The other connections are exactly the same as shown in Figs. 44 and 45. An Intermediate Wave Set With Variocoupler Inductance Coils. By using the coil wound on the rotor of the variocoupler as the tickler the coupling between the detector tube circuits and the aerial wire system increases as the set is tuned for greater wave lengths.
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