ADF4351 SI5351 RF Signal Generator 2.5K-4400MHz Sweep Frequency Clock Signal Source for Walkie-Talkie SDR Radio Frequency METER

ADF4351+ SI5351 Signal Source Module – 2.5KHz–4.4GHz with OLED Display, Dual SMA Outputs, Square & Sine WaveProduct Description:This dual‑chip signal generator combines an ADF4351 and an SI5351 to provide an ultra‑wide frequency range from 2.5KHz to 4.4GHz with independent outputs. It features three SMA ports:K1 (two upper SMA connectors) – differential output from ADF4351, covering 35MHz – 4.4GHz with 1KHz resolution.K2 (lower SMA connector) – from SI5351, covering 2.5KHz – 200MHz with 1Hz resolution.The module outputs square wave from 2.5KHz up to 2.2GHz, and sine wave from 2.2GHz to 4.4GHz. A bright OLED display shows the active channel and frequency. Push‑buttons allow channel selection, digit editing, and real‑time frequency adjustment. An onboard 1.5ppm VCTCXO(calibratable via trimmer) ensures high stability. For even higher precision, an external reference clock (15–30MHz, 2–3.3Vpp) can be injected via the CLK_IN SMA port. Powered by Type‑C (4–6V) .Key Specifications:Frequency range: 2.5KHz – 4.4GHzK2: 2.5KHz – 200MHz (1Hz resolution, square wave)K1: 35MHz – 4.4GHz (1KHz resolution, square wave ≤2.2GHz / sine wave >2.2GHz)Output waveform:2.5KHz – 2.2GHz: Square wave2.2GHz – 4.4GHz: Sine waveReference: Internal 1.5ppm VCTCXO (adjustable) or external 15–30MHz, 2–3.3VppControl: OLED display, 5‑button keypad (left/right/up/down/SW)Power: Type‑C USB, 4–6V DCOutput impedance: 50Ω (SMA female)Dimensions: (not specified, compact)Size:5X5X0.8CM  ( Excluding SMA head)Key Features:Dual independent outputs: wideband from KHz to 4.4GHzHigh resolution: 1Hz on low band, 1KHz on high bandClean square wave up to 2.2GHz; sine wave above 2.2GHzUser‑friendly OLED interface with real‑time frequency updateHigh‑stability VCTCXO + external reference input for calibrationUSB‑C powered, portable for lab and field useApplications:RF circuit testing and developmentHam radio local oscillator / VFOReceiver / transmitter alignmentClock source for digital circuits (square wave up to 2.2GHz)Signal generator for education and labsFrequency calibration and measurement