The 7MB/E-21.4/U7-S10W from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 17.67 to 25.13 MHz, Bandwidth 7.46 MHz (1dB), Center Frequency 21.4 MHz, Insertion Loss 0.76 dB, Upper Rejection 40 dB. Tags: Lumped Component Filter. More details for 7MB/E-21.4/U7-S10W can be seen below.