The 4FS10-8250/U500-P/P from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 7920.25 to 8579.75 MHz, Bandwidth 659.5 MHz (1dB), Center Frequency 8250 MHz, Upper Rejection 70 dB. Tags: Cavity Filter. More details for 4FS10-8250/U500-P/P can be seen below.