STO-03203N05-CM-E1 is a J-Band vector network analyzer (VNA) frequency extender Tx/Rx designed to achieve full 1-port, S-parameter testing at 220 to 330 GHz. The Tx/Rx module includes a precision micrometer adjustable attenuator with 30 dB tuning range. It is compatible with modern vector network analyzers such as the Rohde & Schwarz ZNA, Anritsu VectorStar™, Keysight PNA-X Series, and Copper Mountain CobaltFx. The VNA needs dual sources to be extended. The frequency extender can achieve a dynamic range up to 95 dB for certain passive products that require high rejection, isolation, and return loss testing such as directional couplers, orthomode transducers, and filters. An AC to DC Power adapter and two Proxi-FlangeTM Contactless Flanges (STQ-WG-03010-FB-CF and STQ-WG-03025-FB-CF), are included. The Eravant Wave-Glide™ Rail System (STQ-TL-RW-S10-M1) is highly recommended for the J-Band VNA test. VNA extender is packaged individually in a rugged equipment box with additional hardware and tools.