Image frequencies are typically generated, as a result of the heterodyning operation in a radio receiver. The result is that the receiver may malfunction. Please see previous posts on image frequency generation, image frequency rejection mixers etc, to further understand the problem. This post introduces the reader to an image frequency calculator released by Signal Processing Group Inc. to facilitate image frequency calculation given the received RF frequency and the desired IF frequency. Please access the calculator from the SPG website under the ” Free items…”link.