Question

a) An AM radio station is transmitting a message signal, x(thwhose frequency spectrum shown in Fig. 1(a) using a carrier radian frequency of Qe=1000 rad/sec as shown in Fig 1(b). i) Sketch the spectra of the message at the output of the transmitter. X(w) 10 -2007 2007 W rad sec Fig. 1(a) xt) х m COS Transmitter Fig. 1(b) b) If two neighboring AM stations also transmit signals of the same bandwidth, what must be their carrier frequencies to avoid interference between stations?

Answer 1

a 54)=[Ac tam casletm,l4]] cos(21fet) [ + 10 cef 201 4] cs (10) She = cos(icoott) +16 cos(20017+).cos(1000+) - its[w_looon) +7 8(W+10000) + 12 Cos (10001-2001)+ + Corleone) - U S6wdccom) +++ (W46000t) +50 $(W-8001 )ists(w/stry) 75 $(W42001) +511 8(W712001) s(w) -> W -soo Jovo - 1200 1060 1200 b ③ Carter trequery to 3 2fm, 2 fm2 tette tcz 10000t 2000 1 oooh X4+ 2u 2n is to a 500+400-500 tz 900 4500 34 5262 to z 1400 Hz