The DBL520 from R & K Company Limited is a Frequency Multiplier with Input Frequency 1 to 1500 MHz, Output Frequency 2 to 3000 MHz, Input Power 10 to 13 dBm, Supression F 10 to 20 dBc, Supression 3F 20 to 30 dBc. Tags: Drop-ln. More details for DBL520 can be seen below.