The DBL500 from R & K Company Limited is a Frequency Multiplier with Input Frequency 0.1 to 250 MHz, Output Frequency 0.2 to 500 MHz, Input Power 10 to 13 dBm, Supression F 20 to 30 dBc, Supression 3F 20 to 30 dBc. Tags: Drop-ln. More details for DBL500 can be seen below.