BNSF Telecom 1 Exam Questions with Correct Answers

BNSF Telecom 1 Exam Questions with Correct Answers VHF - Low and High range Very High Frequency - Answer-Low is 30 to 50 MHz High is 150 to 300 MHz UHF - Ultra High Frequency - Answer-300 MHz - 3 GHz Super High Frequency - SHF - Answer-3-30 GHz Extremely High Frequency - EHF - Answer-30-300 GHz Legacy Band - Answer-25 kHz wide channel Very Narrowband - Answer-6.25 kHz wide, digital Narrowband - Answer-12.5 kHz wide analog What is dB and how much power is it - Answer-dB is a decibel and measures 1/10 of a bell What is an acceptable return loss - Answer--14 dB or better (-15,-16,-17 etc would be worse) 4% or 1.5:1 Return loss formula in dB -6 - Answer-dB=10*log(power out/power in) 25% reflective power or 3:1 Return loss formula in dB -9 - Answer-dB=10*log(power out/power in) 11% reflective power or 2:1 Return loss formula in dB -20 - Answer-dB=10*log(power out/power in) 1% reflective power or 1:22