Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

490 FREQUENCY MODULATION, Volume IEquation (69) is already satisfied by A 0n-Since it is known that thevector potentials form an orthogonal set of functions, i.e.,/0, m# ni 0m A 0n *dr = (71)constant, m = nwhere A 0r* is the complex conjugate of A 0n and the integral is takenover the volume of the cavity, we may expand B a) ln in terms of thefunctions A 0n. Thus*i„ (1) = 2 C lnh^A 0h (72)Substituting this into (70) and rearranging and making use of (69),we obtain2 W [ w 2 2O« — ">0fc ] Clnk U) A 0k= — 2tixm0n o>0n A ' 0n— [i.J lH a) (