The APL441.5 from ASB Inc. is a Frequency Synthesizer with Frequency 426.5 to 456.5 MHz, Step Size 250 KHz, Reference Frequency 10 MHz, Output Power 2 to 8 dBm, Harmonics -25 to -15 dBc. Tags: Surface Mount, PLL Frequency Synthesizer. More details for APL441.5 can be seen below.