BNSF Telecom 1 2026/2027 | Study Guide, Practice Questions & Exam Review

BNSF Telecom
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BNSF Telecom 1
VHF - Low and High range
Very High Frequency - CORRECT ANSWER-Low is 30 to 50 MHz
High is 150 to 300 MHz

UHF - Ultra High Frequency - CORRECT ANSWER-300 MHz - 3 GHz

Super High Frequency - SHF - CORRECT ANSWER-3-30 GHz

Extremely High Frequency - EHF - CORRECT ANSWER-30-300 GHz

Legacy Band - CORRECT ANSWER-25 kHz wide channel

Very Narrowband - CORRECT ANSWER-6.25 kHz wide, digital

Narrowband - CORRECT ANSWER-12.5 kHz wide analog

What is dB and how much power is it - CORRECT ANSWER-dB is a decibel and
measures 1/10 of a bell

What is an acceptable return loss - CORRECT ANSWER--14 dB or better
(-15,-16,-17 etc would be worse)
4% or 1.5:1

Return loss formula in dB -6 - CORRECT ANSWER-dB=10*log(power out/power
in)
25% reflective power or 3:1

Return loss formula in dB -9 - CORRECT ANSWER-dB=10*log(power out/power
in)
11% reflective power or 2:1

Return loss formula in dB -20 - CORRECT ANSWER-dB=10*log(power
out/power in)
1% reflective power or 1:22




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Return loss formula in dB -30 - CORRECT ANSWER-dB=10*log(power
out/power in)
Less than 1%

Tera (T) to Base - CORRECT ANSWER-10^12

Giga (G) to Base - CORRECT ANSWER-10^9

Mega (M) to Base - CORRECT ANSWER-10^6

Kilo (K) to Base - CORRECT ANSWER-10^3

Milli (m) to Base - CORRECT ANSWER-10^-3

Micro (u) to Base - CORRECT ANSWER-10^-6

Convert 44 dBm to Watts - CORRECT ANSWER-Watts= 10^((P-30)/10)
25.11 Watts

50 dBm is defined as __________ watts - CORRECT ANSWER-100 W

47 dBm is defined as __________ watts - CORRECT ANSWER-50 W

30 dBm is defined as __________ watts - CORRECT ANSWER-1000 mW or 1
W

33 dBm is defined as __________ watts - CORRECT ANSWER-2 W

40 dBm is defined as __________ watts - CORRECT ANSWER-10 W

20 dBm is defined as __________ watts - CORRECT ANSWER-100 mw

10 dBm is defined as __________ watts - CORRECT ANSWER-10 mW

3 dBm is defined as __________ watts - CORRECT ANSWER-2 mw




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0 dBm is defined as __________ watts - CORRECT ANSWER-1 mW

How much gain/Loss is 3 dBm - CORRECT ANSWER-2X or 1/2

How much gain/Loss is 5 dBm - CORRECT ANSWER-3X or 1/3

How much gain/Loss is 6 dBm - CORRECT ANSWER-4X or 1/4

How much gain/Loss is 9 dBm - CORRECT ANSWER-8X or 1/8

How much gain/Loss is 10 dBm - CORRECT ANSWER-10X or 1/10

How much gain/Loss is 20 dBm - CORRECT ANSWER-20X or 1/100

How much gain/Loss is 30 dBm - CORRECT ANSWER-30X or 1/1000

How much gain/Loss is 40 dBm - CORRECT ANSWER-40X or 1/10000

50 Watts to dB - CORRECT ANSWER-dBm = 10 * log (1000 * P)
47 dBm

Full wave length of 44 MHz (m to in = 39.36) - CORRECT ANSWER-6.82 meters
or 268.44"
1/2 wave - 134.22"
1/4 wave - 67.11"

Full wave length of 160 MHz (m to in = 39.36) - CORRECT ANSWER-1.875
meters or 73.81
1/2 wave - 36.9"
1/4 wave - 18.45"

Full wave length of 450 MHz (m to in = 39.36) - CORRECT ANSWER-.667
meters or 26.25"
1/2 wave - 13.13"
1/4 wave - 6.56"




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