Example 4.5. The designer of an IEEE802.11g receiver attempts to place the image frequency in the GPS band,which contains only low-level satellite transmissions and hence no strong interferers.Is this possible? Solution The two bands are shown in Fig.4.11.The LO frequency must cover a range of 80 MHz but,unfortunately,the GPS band spans only 20 MHz.For example,if the lowest LO frequency is chosen so as to make 1.565 GHz the image of 2.4 GHz,then 802.11g channels above 2.42 GHz have images beyond the GPS band. Figure 4.11.Attempt to make the GPS band the image of an 11g receiver. GPS Band 11g Band 1.565 1.585 2.400 2.480 f (GHz) ))