1. This module can be connected with the pins of the LCD1602/LCD12864 module on the single-chip microcomputer (it can be directly plugged upside down), which is convenient for software debugging and has a lock indication (Lock) 2. It is made with high-quality circuit boards and exquisite craftsmanship. The frequency synthesizer board is a combination of neat layout and stable performance. perfect for ham radio lovers or schools, science education 3. High-quality PLL frequency synthesizer development board for electronic DIY 4. The default reference clock signal is a 10.000MHZ active clock, and an external reference clock signal can also be used. You need to use a soldering iron to modify the tee connection mode, and connect EXT_REF as an external reference signal 5. For ease of use, the default is broadband output, the output is two differential signals, one can be used for output, and the other can be used for monitoring output Technical parameters Output frequency range: 137MHz-4.4GHz (ADF4350) Power supply voltage: 4-9V (5VDC) Output signal: 2.2GHZ--4.4GHz sine wave (fundamental wave) 137MHz--2.2GHz (ADF4350) square wave (fundamental frequency division) Output signal: the output is broadband, signal strength: +5dBm (programmable setting) RF connector: SMA female Control interface: three-wire SPI Reference clock: 10.000MHZ (default), can be externally connected through the SMA interface Weight: 15g Colour:green Material:PCB+metal Size:5 x 5 x 1.5cm Package Contents: 1 * RF Signal Source Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.