Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

104 FREQUENCY MODULATION, Volume Ielectron stream passes from one segment of the target to the other atpoints p xand p/. If now the two deflecting voltages are decreased50 per cent by changing the master amplitude control, all other controlsbeing left the same, the locus of the end of the electron stream will bec 2 and the voltage across Z A will be as shown in Figure 4B. The electronstream now passes from one segment of the target to the other atpoints p2and p.,'. Likewise if the master amplitude control is adjustedto give voltages 50 per cent greater than those which gave the locus c 1(then c 3 will be the new locus, the electron stream will pass from one'target segment to the other at points p s and p- A and the voltage appearingacross Z A will be as shown in Figure 4C. Now, if the masteramplitude control is reset so that the electron circle falls on c 1and a