1 Communication Systems
A telephonic communication service is working at carrier frequency of 10 GHz. Only 10 % of it is utilized for transmission. How many telephonic channels can be transmitted simultaneously if each channel requires a bandwidth of 5 kHz ?
1) $$2 \times 10^3$$ 2) $$2 \times 10^4$$ 3) $$2 \times 10^5$$ 4) $$2 \times 10^6$$
Solution:
Working frequency range $$= \frac{10}{100} \times10 \times10^{9} = 10^{9} Hz$$
Band width of each channel $$ = 5\times10^{3} Hz $$
No. of channels $$ = \frac{10^{9}}{5 \times10^{3}} = 2 \times10^{5 }$$
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