c. The dB gain of each of the three stages. d. The overall gain in dB. 10. Define information capacity and how to calculate I. 11. Determine the wavelength for the signal with the following frequency,...

Extracted text: c. The dB gain of each of the three stages. d. The overall gain in dB. 10. Define information capacity and how to calculate I. 11. Determine the wavelength for the signal with the following frequency, in what RF spectrum band it located and give example their application. [wavelength, 1 =c/f] а. 70МHZ. b. 400MН. c. 4GHZ. d. 100GHZ. 12. How big the S/N is needed in a channel that will pass through 26 kbps voice signal. 13. Define Bandwidth, give example to calculate. 14. What is the significance of a 3dB power ratio? 15. Determine the information capacity for a communication channel with a bandwidth of 15 kHz and a signal-to-noise ratio of 40dB.


Extracted text: 1. What is the purpose of communication system? 2. Sketch the model of communication system and briefly explain the components of the system. 3. Convert the following absolute power ratios to dB: а. 15 b. 3000 c. 0.05 d. 0.008 4. Convert the following decibel values to absolute ratios: а. 2 dB b. 27 dB c. -10 dB d. -34 dB 5. Define decibel. 6. Convert the following powers to dBm: a. 1 mW b. 0.001 µW с. 2 рW d. 2.2x10-16w 7. Converts the following dBm values to watts: a. O dBm b. -13 dBm c. -60 dBm d. 40 dBm 8. Compare analog signal to digital signal. 9. Given a three-stage system compromised of two amplifiers and a filter with an input power of P = 0.01MW and absolute power gains of A, = 250, A2 = 0.3, A3 = 800, determine: a. The input power in dBm. b. Output power in watts and dBm.