Link: What Causes Radio Frequency Interference – Urgent Communications Article

Last month, we discussed radio frequency interference, starting with the different types of natural and man-made noise that have a detrimental effect on system performance. In this article we continue to examine the causes of RFI and then proceed to the devices designed to protect against it.

Desense and blocking. If a strong signal — on the order of 60 dB or greater than the signal that you are trying to receive — is offset by one or more channels away from the receiver channel, you can get into a situation where the mixer stage of your receiver no longer functions properly and the receiver no longer hears the unit to which the channel is tuned. This is called “desense” or ”blocking,” and it is quite common at crowded radio sites.

via Part 11: What causes radio frequency interference – Urgent Communications article.