The QRF-3420-3700-60 from Qualwave is a Band Stop Filter with Stopband Frequency 3420 to 3700 MHz, Bandwidth 280 MHz, Insertion Loss 1.2 dB, Rejection 60 dB, Power 10 W. Tags: Module with Connectors. More details for QRF-3420-3700-60 can be seen below.