Which of the following actions should you take if a neighbor tells you that your station's transmissions are interfering with their radio or TV reception?

If a neighbor reports that your station's transmissions are interfering with their radio or TV reception, the first appropriate action is to ensure that your station is functioning properly. This is crucial because interference can sometimes arise from equipment malfunction or improper setup on your end. Checking your equipment can help determine if there is an issue with your transmitter, antenna, or other related components that could be causing undue emissions or harmonics that might be affecting nearby devices.

Taking this initial step allows you to address any potential technical problems before considering further actions. If your station is found to be operating correctly, you can then explore other potential solutions or adjustments without jumping to conclusions or drastic measures like turning off the transmitter. Ensuring that your equipment is functioning correctly is essential before considering external factors or making changes to your operations.

Other options, such as immediately turning off your transmitter or using a harmonic doubler, may not effectively address the root of the problem and might not be necessary if your equipment is functioning within specifications. Therefore, starting with a check of your station's performance aligns well with standard operating procedures and good amateur radio practice.