For commercial FM, the bandwidth is about 100 kHz and for AM it is about 5 kHz. This is consistent with channel spacings of 200 kHz and 10 kHz, respectively. Take a look at the digital receiver block ...

Figure 1 shows a notional block diagram of a radar receiver/exciter. Notice that the LRU contains frequency references, local oscillator generation, up/down frequency conversion, and digital-to ...