Model SYN151 is a low-profile, line-replaceable-unit (LRU) configured frequency synthesizer from TRAK Microwave based on indirect-synthesis and direct-digital-synthesis (DDS) approaches. It provides two independent and agile output signals at L-band with step sizes smaller than 1 Hz and switching speeds faster than 200 microseconds. Engineered for airborne environments, it achieves spurious performance in excess of -65 dBc and phase noise of better than -70 dBc/Hz offset 10 kHz from the carrier and better than -100 dBc/Hz offset 1 MHz from the carrier. It measures 7.4 x 4.5 x 1.285 in. with SMA connectors.