Why 2 mixers in VHF diagram?

In a VHF (Very High Frequency) diagram, two mixers are typically used for frequency conversion to improve performance and selectivity. The first mixer down-converts the incoming VHF signal to an intermediate frequency (IF), allowing for better filtering and amplification. The second mixer can be utilized for further processing or to shift the signal to a different frequency band. This dual-mixer setup enhances the overall system's sensitivity and dynamic range, enabling more effective signal processing in communication systems.