*Question G4C02:
Which of the following could be a cause of interference covering a wide range of frequencies?*  

*Correct Answer is  C: Arcing at a poor electrical connection*  

### AI Response: (may contain errors)  

Arcing at a poor electrical connection can cause interference over a wide range of frequencies because the arc acts like a broadband noise source. When electrical connections are poor, they can intermittently make and break contact, creating sparks or arcs. These arcs generate electromagnetic interference (EMI) that can spread across a broad spectrum, affecting many frequencies.

Here's why the other choices are incorrect:

- **A: Not using a balun or line isolator to feed balanced antennas**  
  This can cause common-mode currents, which may lead to interference, but it typically affects specific frequencies rather than a wide range.

- **B: Lack of rectification of the transmitter’s signal in power conductors**  
  This is not a typical cause of broadband interference. Rectification issues might cause distortion or harmonics, but not wideband noise.

- **D: Using a balun to feed an unbalanced antenna**  
  This might lead to mismatches or inefficiencies, but it does not typically cause broadband interference.

In summary, arcing is a broadband noise source, while the other issues tend to affect specific frequencies or cause other types of problems.