A super heterodyne receiver is designed to receive signals with carrier frequencies between 4 and 6 MHz with transmitted bandwidth of 100 KHz each. Its Intermediate frequency is 850 KHz. The range of local oscillator frequency that is required using high-side injection (fLo > fc) is:
1
4 to 6 MHz
2
4.85 MHz to 6.85 MHz
3
3.15 MHz to 5.15 MHz
4
4.1 MHz to 6.1 MHz