Spurious Responses Answer the following questions for the system and input spectrum shown in Figure 8-65. The component parameters are as follows: • BPF1: 110 MHz CF, 25 MHz BW, 1 dB IL • BPF2: 10.7...

Spurious Responses Answer the following questions for the system and input spectrum shown in Figure 8-65. The component parameters are as follows:

• BPF1: 110 MHz CF, 25 MHz BW, 1 dB IL

• BPF2: 10.7 MHz CF, 1 MHz BW, 6 dB IL

• All filters are Butterworth

• Mixer insertion loss: 11 dB

a. To what frequency is the receiver tuned?

b. Under the input conditions shown in Figure 8-65, the receiver suffers from a lack of sensitivity. In other words, we can’t see the tuned signal at the output of the IF filter when the tuned signal is small but well above the receiver’s MDS. What is the problem, and how would you fix it?