1. The PC control software can exports files, which can be used for various radio design and simulation software. 2. The improved frequency algorithm can use the odd harmonic extension of si5351 to support the measurement frequency up to 900MHz. 3. It is mainly for the study of customers who can DIY, you need to prepare the SMA cable yourself. 4. It has no metal shield. The main advantage is that users with strong hands-on ability can open the machine to view the circuit structures. However, when measuring frequencies above 300M, it is easy to be interfered by other signals. So this product is recommended for learning principles and use at lower frequencies. 5. The 50k-300MHz frequency range 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.