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14
RADIO BROADCAST
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KQL ArnoA.KIuge
KZY Atlantic &. Pacific Radio Sup.
KQW Charles D.Herrold
KJO C. O.Gould
KLB Colin B.Kennedy Co.
KGB Edwin L.Lorden
KGC Electric Lighting Co.
KVQ J.C.flobrecht
KLB J.J.Ounn & Co.
KYJ Leo J.Meyberg Co.
KDN Leo J.Meyberg Co.
KFC ^Northern Radio Electric Co.
KWG Portable Wireless Tel.Co.
KZM Preston D.Allen
KYY Radio Te.lephone Shop
KIJ The Radio Shop
KZC Western Radio Electric Co.
KGC Pasadena Honiywoodo o KLB
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PACIFIC COAST BROADCASTING STATIONS
electrical machinery ever devised; but from the standpoint of the layman it is simply a modified form of electric lamp, with a filament that is heated from a. cherry red to incandescence, according to the type of tube, a little helix or fine wire or a length of wire bent in zigzag pattern and called a grid, and finally a cylinder or one or more little squares of nickel or other metal, known as the plate.
The vacuum tube is the modern Aladdin's lamp. It can do so many things in electrical work that it is virtually an acrobat. It generates alternating current of a wide range of frequencies; and as has been demonstrated, currents of high frequencies are suitable for the generation of radio waves. Thus the vacuum tube, which is positive in its operation, becomes an excellent generator of radio waves. Feed it alternating current, on the other hand, and it rectifies it into direct current — current that flows in one direction only. This feature makes it available as a means of recharging storage batteries ofi^ alternating current, and a simple outfit now takes the place of the elaborate storage battery recharging sets of but a few years ago. Again, this feature makes it available as a remarkable detector of radio waves for reception purposes. Feed it a slight fluctuating current, such as a telephone current, and it will modulate or modify a far more powerful current in the same manner; in other words, we have a weak current moulding a powerful current; and since this process can go on through several stages, with each stage handling a still more powerful current, we have a means of making very big sounds out of little sounds, which is what our present-day amplifiers do in radio. It is this characteristic, too, which makes the vacuum tube the best telephonic relay or repeater ever used. It is employed in longdistance telephone communication, so that the voice currents, after traveling through hundreds of miles of wire and becoming greatly attenuated, are brought to the grid member of a vacuum tube and thus serve to control a fresh current starting out on the next few hundred miles. The voice characteristics of the weak current are re-impressed on the strong current, so that virtuall\ nothing is lost no matter how great the distance may be. Again, the vacuum tube, because of its modulating characteristics, is the link between the ordinary telephone microphone or telephone transmitter and the powerful current used for