The USB-TG44A from Signal Hound is a USB-based tracking generator that operates from 10 Hz to 4.4 GHz. It works with the USB-SA44 and USB-SA44B spectrum analyzers to measure filters, attenuators, amplifiers and other components to carry out scalar network analyzer measurements. The tracking generator has an amplitude range from -30 to -10 dBm and an absolute accuracy of 2 dB with a harmonical component level of less than -10 dBc.