Irg

Fig. 10-2 Anti-sidetone Station Circuit the capacitor and Sx and either through S2 or the receiver. Because of the relatively high resistance of S2 most of the current will tend to flow through the receiver, but the induction coil is so designed that current flowing in p and Sj will induce a voltage in the winding S2 which will tend to set up a current approximately equal and opposite in direction to that flowing through the receiver. The net effect is no current in the receiver, and hence no...

Dtb

Fig. 23-19 Waveguide Band-pass Filter Section tively shorten the lines of magnetic force. Plates, with their irises, of course represent discontinuities in the guide and will therefore tend to cause wave reflections and reflection losses. But, when the cavity section is of proper length (in the order of one-half wavelength) reflections returning into the waveguide line in either direction from the two discontinuities will be so phased as to cancel each other. At the particular frequency at...

Crosstalk

The currents in the disturbing circuit. The effects of these two fields are not entirely alike, although their results are generally similar as far as crosstalk is concerned. As we know, the effect of the magnetic field of one circuit on a second paralleling circuit is called magnetic induction. Similarly, the effect on the second circuit of the electric field of the first circuit is called electric or electrostatic induction. How magnetic induction causes crosstalk can be seen by referring to...

R

Which is the usual equation of the Wheatstone bridge. Figure 5-11 illustrates the conventional method of showing the Wheatstone bridge. It is almost identical to the arrangement shown by Figure 5-10, but has the resistors connected in a diamond shaped diagram. amp is a switch for disconnecting the battery when not in use, and Sz is a similar switch for disconnecting the galvanometer. Binding posts are shown for connecting the unknown resistance to be measured, which is usually designated as X....

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Permalloy Hysteresis Temperature

While the same may be said of the magnetic circuit in air, in iron the condition is different. As the number of lines of induction are increased or the flux density is increased , the permeability of the iron is changed, and any further increase in the magnetizing force or field intensity may not mean a proportional increase in the flux density. In simpler terms, that property of the iron which enables it to establish more lines of induction depends entirely upon the number of...

Gep

Fig. 18-4 Application of Thevenin's Theorem to the Network of Fig. 18-3 Thevenin's Theorem gives us a method of substituting a simple equivalent circuit for any complicated electric system, but in so doing we are required to replace the source of electromotive force with one having another value. It is often desired to determine the simplest equivalent network for a complicated electric system, which will supply to some receiving device the same current as the electric system and will take from...

Telephone Transmission Theory

Any transmission system consists of three essential parts a source of energy, a medium over which it is desired to transmit energy to a receiving device, and the receiving device itself, which usually converts the electric energy into some form more useful. In a power transmission line, an electric generator may be the source of energy high voltage lines with transformers at either end may be the transmitting medium a motor, lamp, or heater may be the receiving device for converting electric...