What is a logical first step when attempting to cure a radio frequency interference problem in a nearby telephone?

When addressing a radio frequency interference (RFI) problem impacting a nearby telephone, installing an RF filter at the telephone is a logical first step. This is because an RF filter specifically designed for the telephone can effectively reduce or eliminate the unwanted radio frequency signals that may be affecting the operation of the telephone. The filter blocks out the unwanted frequencies, allowing only the desired signals to pass through, which helps restore normal functionality to the device.

In cases of RFI, it is often the end equipment, such as telephones, that are susceptible to interference. By equipping the telephone with an RF filter, you are directly targeting the source of the interference that affects its performance. This approach is typically more straightforward and immediate than other solutions, such as improving the grounding of the station or installing filters at the transmitter, which may not directly resolve the issue in the affected device.

Therefore, addressing the issue right at the point of interference helps in quickly determining whether the problem can be resolved without needing to modify the transmission system or perform more complex troubleshooting. This targeted approach is often the most effective first step in RFI problem-solving.