. The principles underlying radio communication . g to the laws already treated in Section 116. Fig. 154shows the nature of the damped oscillations in the primaryand secondary circuits. The primary decrement is assumed tobe and that of the secondary The two coexistent fre-quencies are supposed to have the ratio of 4 to 5. The curve ofoscillations is in each case drawn as a full line. The dottedcurves show the beating effect described above, while the dashedcurves give an indication of the damping effect. It is notice-able that the primary current is passing through its maximumvalues
. The principles underlying radio communication . g to the laws already treated in Section 116. Fig. 154shows the nature of the damped oscillations in the primaryand secondary circuits. The primary decrement is assumed tobe and that of the secondary The two coexistent fre-quencies are supposed to have the ratio of 4 to 5. The curve ofoscillations is in each case drawn as a full line. The dottedcurves show the beating effect described above, while the dashedcurves give an indication of the damping effect. It is notice-able that the primary current is passing through its maximumvalues at the moments when the secondary current is zero, andvice versa. Further, when the primary is passing through aperiod of intense oscillation, the secondary oscillations aresmall, etc. COUPLED CIRCUITS. 277 Another important conclusion which can be drawn from is that the energy of the coupled system is transmitted alter-nately from the primary to the secondary, and back again fromthe secondary to the primary. Thus, at certain moments the. Fig. in Coupled of Primary Circuit - of Secondary Circuit - cosRatio of Frequencies — s to 4 energy is entirely in the primary, at others entirely in thesecondary, and at other instants partly in the primary andpartly in the secondary. This transfer of energy, first in onedirection and then in the other, shows that the primary andsecondary play alternately the role of driving circuit. 278 RADIO CIBCUITS. From the standpoint of radiation of energy, it is desirable tohinder the return of energy to the primary, after it lias oncebeen given to the secondary. Since the closed primary circuitis of such a nature as to radiate very little energy (see ), no useful purpose is served by the transfer of energy backto the primary, and some of the energy thus handed back is nec-essarily lost in heating in the primary. Further, the radiationof the energy of the secondary in waves of two diffe
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