Mohave County miner and our mineral wealth., 1922-06-09

diated in any single wave, but is
 rried by broad band of wave
 hgths. If the set were adjusted to
 |diate energy chiefly on a wave
 hgth of 600 meters, the greater por-,
 bn of the energy would be carried by;
 lat wave, but all the wave lengths on
 bth sides of the 600 meter wave, for
 considerable, number q of wave
 ngths, would also carry some of the
 Adiated energy. Any receiving sta
 on tuned to receive signals on the
 DO meter wave length would hear this
 Transmitting station, but due to the
 road wave being transmitted, Ssta-
 ions tuned to any wave length be-
 ween about 400 and 800 meters
 9ould also hear this same station. Be
 ause We wished to transmit our sig7t lals on wave length. of 600 meters,
 is readily seen that all the energy
 hat is radiated on other waves 5 is
 Easted. < Since a! considerable amount Ii energy is SC, wasted, our signals on
 e 600 meter wave cannot be heard
 t the same distance as theywould be
 five fadiated nearly all the energy in the one wave. It is also noted that if hnother station were sending out sig, nals on wave length of 485 meters lat the same time we were transmit fing on 600 meters, any station try 6ng to receive the 4S5 meter waves |mould be hearing both those signals land our signals, due the broad wave |our station was radiating., The, .re- |ceiving station would hear ap unin- |telligble sequence of dots and 5dashes,
 ue to the interference our station was causing. Thus we see that there are two reasons. why our ;transmitter should be so adjusted that a broad wave will not be radiated: (a) In or der that as much energy as possible may be radiated on the wave on which we are transmitting so that our sig nals may be heard as great distance away as possible, and (b) In order that we do not cause interference for other stations working on other wave lengths.
 To prevent the radiation of a broad, or impure wave is necessary to make a change in the connection of the ap- paratus. Refer to Figure one, shown herewith. This is a diagram of al tuned damped wave transmitter. It will be noted that Section 1, and Sec tion 2, forms the same circuit describ- ed in the first part of the last In- stallment,-it comprises simple Cap acity-Inductance circuit (Section p, with the source of f high potential (Section D. Section is made up of the antenna; (A), an inductance CD, a condenser co, and the ground con nection co.
 { The inductance CD, and the induc- tance (L2) compose an individual piece of apparatus called an oscilla- tion transformer. These inductances are made of several turns of heavy copper wire, either wound on cylin- ders, so that one coil may be moved into or out of the other, or wound in a flat spiral, so that they may be moved towards or away from each other on a common shaft. It will be noted that the number of turns of wire being used on each coil can be varied,-indicated by the arrow heads on the lines representing the connect ing wires,-and also that the antenna circuit series condenser co, is also variable. By adjusting both this con denser and the antenna circuit induc- tance, the frequency, and therefore the wave length, of this circuit can be changed to any desired amount.
 If we adjust both the antenna cir cult (Section 3 and the oscillation generator circuit (Section 9 to the same frequency, the two circuits will be in resonance. By this we mean