Features: brand new and high quality This ADF4351 signal source development board has well designed circuit board layout. It can be controlled by the upper computer official software.All control pins are leaded out for convenient operation. Default + -50ppm 25M active crystal oscillator.Circuit diagram in PDFformat and STM32 test program are provided. Three-wire Spilead to control pin and state locking pin, allowing all functions including point frequency sweep and frequency hopping, stepping to 1K, low frequency step can be 0.1K, according to crystal frequency. The control interface of the single chip controller for easy controlling independently. Specifications: Material:PCB Requency range: ADF4351: 35M-4.4G, Power supply: DC002 Interface:DC4-9V typical:5V Output signal: 2.2-4.4G fundamental waves Output signal interface: SMA female Size:Approx.49x37x7mm/1.93x1.45x0.27inches Package Includes: 1x ADF4351 Development Board note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.