STG-28-S1 is a full Ka-Band noise figure and gain test extender that extends the noise and gain measurement capabilities of common and low frequency signal synthesizers and noise figure meters to the frequency range of 26.5 to 40 GHz. This extender is designed to interface with industry standard noise and gain test systems, such as the Keysight 8970A/B and NF7-class noise figure analyzer, as well as signal/spectrum analyzers with a noise figure measurement function, such as the R&S FSV3000. It can also interface with most noise and gain analyzers in the 10 MHz to 1.6 GHz frequency range. The down-converter requires 13.25 to 20 GHz at +3 dBm input power as its LO, which can be obtained from a standard 20 GHz synthesizer, such as Eravant models STL-SG-022403-S1 or SOT-02220313200-SF-B6.