STE-SF415-S1 is a high output power V-Band X4 frequency extender that uses an input frequency range of 12.5 to 18.75 GHz at +5 dBm along with harmonic generation and filtering to produce a 50 to 75 GHz RF signal. The extender features an adjustable attenuator for output power control. The extender is designed and manufactured as a bench top unit to extend the low frequency synthesizer or sweeper, such as Eravant models STL-SG-022203-S1 or SOT-02220313200-SF-B6, without losing all of the functionalities and features. The extender also features adjustable legs, which can also be removed, to allow for an easy test set up.