How to choose frequency of local oscillator for heterodyne principal

1. How do I choose a local oscillator frequency?
2. What is the frequency of local oscillator in a super heterodyne receiver?
3. What is the frequency of FM local oscillator?

How do I choose a local oscillator frequency?

With an IF of 10.7 MHz the local oscillator (LO) can be 10.7MHz lower (or higher) than the signal to be received. For instance, if you wish to tune a radio station at 88 MHz then the LO will need to be 77.3 MHz (or 98.7MHz) and here's the subtlety....

What is the frequency of local oscillator in a super heterodyne receiver?

The local oscillator is tuned to 580 + 455 = 1035 kHz. But a signal at 580 + 455 + 455 = 1490 kHz is also 455 kHz away from the local oscillator; so both the desired signal and the image, when mixed with the local oscillator, will appear at the intermediate frequency.

What is the frequency of FM local oscillator?

The tuning frequency range of the oscillator is from 99.7MHz to 118.7MHz. And in the pass band the amplitude should be equal to or higher than -2dB up to 118.7MHz. And the rejection band is defined by the -20dB corner at 200MHz.