Transmission Power Worksheet TECH 152 Maximum Marks: 15 Part 1 Power in Decibels and Watts (8 Marks) 1. Calculate 10 log() 2. Calculate 101.7 3. Convert 7mW to dBm 4. Convert 1.5W to dBm 5. Convert -2.5dBm to mW 6. Convert 40dBm to watts 7. Calculate 5dBm + 5mW 8. Calculate 3mW - (3dBm) Part 2 Power Loss Calculations (4 Marks) 1. A signal at the sender has power of 500mW. As it travels through media its power is reduced to 380mW at the receiver. Calculate the insertion loss in dB due to attenuation. 2. A signal travels through media and its power is reduced by one half Calculate the insertion loss in dB. 3. A 100m Cat 5e cable has insertion loss of 28.1dB at 150MHz. (Reminder that insertion loss implies that the dB value is always negative.) If the input signal is 1500mW, what would be the signal level at the end of the cable? Give your answer in mW. 2 TECH 152 Maximum Marks: 15 Transmission Power Worksheet 4. LMR-400 coax cable has an approximate insertion loss of 0.25dB per meter for transmission frequency of 2.4GHz. If the input signal is 2mW. what is the expected power in mW of a signal at the end of a 7m cable? I Part 3 Free Space Path Loss (3 Marks Calculate Free Space Path Loss (FSPL) for 2.4 GHz WiFi frequency between an access point and a PC that is 12 m away. Show your work. Hint: use the lecture notes or the Internet to lookup the formula for FSPL