Features DDS signal generator supports 0-55MHz continuous adjustment in 1Hz steps Signal generator with direct digital input frequency and with audio volume potentiometer Module with power amplifier and gain potentiometer, with AGC potentiometer DDS signal generator is S LED display and standing wave LED display, 12V input and output The DDS signal generator is made of PCB material, which is resistant to wear and has a long service life Specification: Item Type: Shortwave DDS Generator Module Material: PCB Model: AD985 Button and Connection Interface: ENC: Encoder switch MEM: Switch memory mode VFO: Transfer from VFO A to VFO B, or transfer from VFO B to VFO A SSB: Working mode change: cycle from USB, LSB, AM, CW, etc. RIT: Fine tuning the receiving frequency CAL: Setting function KB-1 and KB-2 Have a Common Pin, but not GND Interface Function: 12V input and output, standing wave test signal input, manual gain increase adjustment, bandwidth power adjustment, audio volume adjustment, PTT & CW to the motherboard, Mode & Band Control corresponding to the motherboard, DDS test power supply Instructions: Press CAL, power on, and enter the setting interface. Let go/release CAL. A: ENABLE 6XREFCLE: Set the chip clock mode and adjust the frequency encoding setting. AD9851 is set to 6 times frequency, AD9850 is set to 1 times frequency. Press CAL and then quickly release to go to the following step B. B: DDS-SYSTEM-CLK: Chip operating frequency setting. Use the encoder switch to adjust the value. Follow the STEP key operation. AD9851 is set as the oscillator 6 times frequency channel, and AD9850 is set as the actual output of the oscillator. Press CAL and then quickly release to go to step C. C: MIN_RX_DDS_FREQ: Set the minimum operating frequency. Use the encoder switch to adjust the value and press the STEP key. Press CAL and then quickly release it to go to step D. D: MAX_RX_DDS_FREQ: Set the maximum operating frequency. Use the encoder switch to adjust the value and press the STEP key. (Less than 60MHz is fine). Press CAL and then quickly release it to go to step E. Package List:1 x Signal Generator 1 x User ManualNote:Please use according to the parameter voltage Package List 1 x Signal Generator 1 x User Manual