This is a DIY product with vector network measurement function. It includes a 2.8-inch touching screen, TX/RX measurement, can determine the complete S11 and S21 parameters, if you need to get S12 and S22, you need to manually replace the trans-ceiver port wiring. Features: The PC control software can export Touchstone (snp) files, which can be used for various radio design and simulation software. The improved frequency algorithm can use the odd harmonic extension of si5351 to support the measurement frequency up to 900MHz. The 50k-300MHz frequency ranges of the si5351 direct output provides better than 70dB dynamic. The extended 300M-600MHz band provides better than 50dB of dynamics, and the 600M-900M band is better than 40dB of dynamics. Small and portable, easy to use, this project aims to provide an radio frequency gadget but useful instrument for enthusiast. Specifications: Material: PCB Color: black Measurement frequency: 50KHz~300MHz (50KHz~900MHz, enable extended firmware)(the products will be updated with the latest firmware before shipping, the actual measurement frequency is 50KHz~900MHz) Radio frequency output: -13dbm (maximum -9dbm) Frequency accuracy: