The 4FS10-1800/T100-P/P from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 1724.95 to 1875.05 MHz, Bandwidth 150.1 MHz (3dB), Center Frequency 1800 MHz, Insertion Loss 0.27 dB, Upper Rejection 40 dB. Tags: Cavity Filter. More details for 4FS10-1800/T100-P/P can be seen below.