Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

f(1:''MODULATION BY ELECTRON BEAMS 481rane space is the sum of the magnitudes of the current away fromand toward the cathode.Effect of Modulation Rate on Electronic AdmittanceIf a resonant beam of the type herein described is to be used tomodulate or control oscillating systems, it is important to know howthe electronic admittance Y edepends on the modulation rate. Assume,for instance, that the beam current is not constant but is of the formIj+ v cos „, is the modulation frequency and p is the modulation coefficient.Then (8) becomesdlm — iE n-- (1 + p cos a> mt ) [e'm 2( c ) v J/ cos o>J [e«««-"> - */« 1] dz. (27)and recall that (I _ e «9+0) 1 — ei?4> J(28)Combining I xand L 2 , one can write the over-all modulated admittanceY em in expanded trigonometric terms as followsL 2 | 7|Y em = H [1 + pS t (9, ) cos («,,„,* + R (J), $) ) 11 - cos 64d 2 V I # 2— sin (9+ i ___ __ \l+pS 9 (9,