Description 1 4in1 Filter is a four in one filter that can be used with all popular receivers radios SDR and Malachite on the market 2 This product contains four sets of independent band pass filters The filters are divided into 4 frequency bands The P1 filter is 0 5 1 5MHz which is suitable for medium wave radio listening The P2 filter is 4 5 12MHz which is suitable for short wave low frequency Frequency band as well as the 40 meter amateur frequency band the P3 filter is 12 30MHz which meets the use of shortwave high frequency bands and the use of the 20 meter 15 meter and 10 meter amateur frequency bands The P4 filter is the FM broadcast frequency 88 108MHz The four in one filter can be used with a one to four active splitter to provide pre filter functions for SDRs radios and receivers 3 Malachite pre filter makes up for the all metal aluminum shell malachite radio design without pre filter reducing interference in frequency bands such as medium wave and short wave FM broadcasts The filters are divided into four groups 0 5 1 5MHz 4 5 12MHz 12 30MHz 80 110MHz can be used with a 1 4 splitter to achieve multi channel and multi band reception at the same time Features 1 Versatile Functionality The 4 in 1 Filter is versatile and compatible with all top selling receivers ensuring a great shopping value 2 Optimal Frequency Filtration The product comprises four separate band pass filters addressing multiple frequency bands for maximum reception