CBT Equipment & Troubleshooting 3

Question 1

An STL (Studio-Transmitter Link) operating at 950 MHz shows excessive bit errors after a heavy rainstorm. What is the MOST likely cause?

Accepted Answer

Water ingress into waveguide or coaxial connections

Answer

Water entering RF connectors or waveguide sections dramatically increases signal attenuation and causes multipath interference, raising the bit error rate.

Question 2

A technologist measures -10 dBu on an unbalanced consumer audio output but expects +4 dBu on a balanced professional input. What device is needed to interface them correctly?

Accepted Answer

Active balun or line-level matching transformer

Answer

A balun or active matching device converts the unbalanced consumer level to balanced professional level, correcting both impedance and level differences.

Question 3

In an ATSC 3.0 broadcast system, what is the role of the bootstrap signal?

Accepted Answer

It provides receiver synchronization and system discovery information

Answer

The ATSC 3.0 bootstrap signal allows receivers to synchronize with the OFDM signal and discover system parameters without prior knowledge of the configuration.

Question 4

A transmitter's forward power reads 10 kW but the reflected power meter reads 2 kW. What is the net delivered power to the antenna?

Accepted Answer

8 kW

Answer

Net delivered power equals forward power minus reflected power: 10 kW − 2 kW = 8 kW.

Question 5

Which piece of test equipment is used to verify proper color burst phase and subcarrier frequency in an analog NTSC composite video signal?

Accepted Answer

Vectorscope

Answer

A vectorscope displays the chrominance phase and amplitude, allowing technologists to confirm correct color burst and subcarrier alignment.

(CBT) Certified Broadcast Technologist Practice Test

(CBT) Certified Broadcast Technologist Practice Test

CBT Equipment & Troubleshooting 3