The situation is considerably different for the high band, low IF case. As before, we shall start by plotting the LO fundamental against the signalfrequency axis and then add and subtract the IF, producing the results shown in Figure 7-4. Note that the 1 and 1+ tuning ranges are much closer together, and in fact overlap, because the IF is a much lower frequency, 321.4 MHz in this case. Does the close spacing of the tuning ranges complicate the measurement process? Yes and no. First of all, our system can be calibrated for only one tuning range at a time. In this case, we would choose the 1 tuning to give us a low-end frequency of about 2.7 GHz, so that we have some overlap with the 3 GHz upper end of our low band tuning range. So what are we likely to see on the display?
