If a Signal with a power level of 40 mW is inserted onto a t

If a Signal with a power level of 40 mW is inserted onto a transmission line and the measured power some distance away is 10 mW, calculate the loss of signal strength is decibels. 20 popints

Solution

L_DB=10 log (P_in/P_out)

P_in = 40mW (given)

P_out = 10mW (given)

Substituting the values,

L_DB=10 log (40/10)

=> 10 log (4)

=> 10 (0.602) => 6.02 dB

Therefore, loss of signal strength = 6.02 dB