1. It is a DIY vector network analyzer. It has a 2.8-inch touch screen and 400mAh of power and can be used offline within 2 hours. If you want to extend the test time, you can connect it to an additional mobile power source or contact us for more capacity. 2. We have redesigned its PCB board. Designed with simple but practical PC control software, you can export Touchstone (snp) files for various radio design and simulation software from PC software. 3. Its improved frequency algorithm supports the odd harmonic expansion of the si5351 and supports 900MHz measurement frequency. Its extended 300M-600MHz band provides better than 50dB of dynamics, while the 600M-900M band provides better than 40dB of dynamics. 4. The si5351 is designed with a metal shield to reduce external interference and improve measurement accuracy. It can directly output 50K-300MHz frequency, and the dynamic performance is better than 70dB. 5. For testing with TX / RX, you can get the full set of parameters for S11 and S21. All you have to do is replace the connection cable in the receiving port and the sending port.