The AM3138 from Atlanta Micro is a Tunable Filter with Frequency 1.3 to 3.25 GHz, Tunable Frequency 1.3 to 3.25 GHz, Bandwidth 1950 MHz, Rejection 35 dB, Input Power 27 dBm. Tags: Surface Mount, Voltage Controlled, Analog Tunable. More details for AM3138 can be seen below.