The Comstron Model FA4230 is a switchable filter module containing four filters, with the capability of selecting any one of the four filters with a 2 bit TTL control signal. The FA4230 offers a design having extremely high frequency selectivity, minimum switching time, and ultra miniaturized size. The FA4230 is screened to MILSTD-883 procedures and operates over the temperature range of -55 C to +105 C