What is the image frequency if the normal channel is 151.000 MHz and the IF is at 11.000 MHz?

To determine the image frequency when given a normal channel frequency and an intermediate frequency (IF), you can use the formula for calculating the image frequency. The image frequency is found by adding twice the IF to the normal channel frequency. This is based on the principle that an image frequency can interfere with the desired signal and is derived from the frequency conversion process in a superheterodyne receiver.

In this case, the normal channel frequency is 151.000 MHz and the IF is 11.000 MHz. To find the image frequency, this calculation is performed:

Image Frequency = Normal Channel Frequency + 2 × IF

Image Frequency = 151.000 MHz + 2 × 11.000 MHz

Image Frequency = 151.000 MHz + 22.000 MHz

Image Frequency = 173.000 MHz

However, this value isn't among your choices, so it seems that we should subtract the IF from the normal channel frequency to find the image frequency as well:

Image Frequency (lower side) = Normal Channel Frequency - IF

Image Frequency = 151.000 MHz - 11.000 MHz

Image Frequency = 140.000 MHz

Thus, the correct calculation shows that the image frequency is 140.000 MHz