The present invention provides systems and methods for pre-filter in a VHF
receiver using Micro-Electro-Mechanical Systems (MEMS) filters. The
system includes an antenna, and first and second Micro-Electro-Mechanical
Systems (MEMS) filters. The first MEMS filter filters a signal received
by the antenna based on a first pre-defined bandwidth, and the second
MEMS filter filters the signal filtered by the first MEMS filter based on
a second bandwidth. The system also includes an analog to digital
converter that converts the signal filtered by the second MEMS filter
into a digital signal, a down converter that down converts the digital
signal produced by the A to D converter, and a digital signal processor
that processes the down converted digital signal produced by the down
converter. The first and second MEMS filters or the down converter are
adjustable based on a received tuning signal.