SI5351 Programmable Clock Signal Generator 2.5kHz-200MHz Square Wave SMA RF Signal Source for Ham Radio GPSDO Frequency Counter

SI5351 Clock Generator / Square Wave Signal Source ModuleProduct Description:This signal generator module is based on the SI5351programmable clock generator IC, capable of producing stable square wave signals across a wide frequency range. It features three SMA output ports, adjustable frequency via buttons, and optional external frequency reference for high-precision applications. Powered via Type-C USB (3.3V–5V) , it is ideal for lab testing, RF experiments, education, and as a versatile clock source.Usage Instructions:Power: Connect a 3.3V–5V DC supply via the Type-C port.Size:5X5X0.8CM ( Excluding SMA head)Outputs: The board has three SMA output ports:K0: Fixed output from the onboard crystal oscillator frequency.K1 & K2: User‑adjustable outputs via buttons Frequency range: 2.5kHz – 200MHz.Frequency Adjustment:Use the middle button to select the output channel (K0/K1/K2). The selected channel will be highlighted (inverse display).Use the left/right buttons to choose the digit to edit.Use the up/down buttons to increase/decrease the selected digit. The output frequency updates in real time.Press the middle button to save the frequency for the current channel and move to the next channel.High‑Precision Calibration:For applications requiring high frequency accuracy, you can input a known reference frequency into the CLK_IN SMA port (left side) and set that value as the K0 frequency.Alternatively,measure the onboard crystal oscillator’s actual frequency at the K0 port with a frequency counter, then set that measured value as K0 to calibrate the entire module.Specifications:ParameterValueChipsetSI5351Output TypeSquare waveOutput Ports3 × SMA (K0, K1, K2)Frequency Range (K1/K2)2.5kHz – 200MHzK0 OutputOnboard crystal frequencyPower SupplyType-C, 3.3V – 5V DCCalibrationExternal reference or measured K0 frequencyApplicationsLab signal source, clock generation, RF experimentsApplications:Laboratory signal and clock generationRF circuit testing and debuggingHam radio projectsEducational electronics experimentsAs a programmable clock source for microcontrollers and FPGAsFrequency calibration and measurement setups