Feature:1. DDS signal generator supports 0-55MHz continuous adjustment in 1Hz steps2. Signal generator with direct digital input frequency and with audio volume potentiometer3. Module with power amplifier and gain potentiometer, with AGC potentiometer4. DDS signal generator is S LED display and standing wave LED display, 12V input and output5. The DDS signal generator is made of PCB material, which is resistant to wear and has a long service lifeSpecification:Item Type: Shortwave DDS Generator ModuleMaterial: PCBModel: AD985Button and Connection Interface:ENC: Encoder switchMEM: Switch memory modeVFO: Transfer from VFO A to VFO B, or transfer from VFO B to VFO ASSB: Working mode change: cycle from USB, LSB, AM, CW, etc.RIT: Fine tuning the receiving frequencyCAL: Setting functionKB-1 and KB-2 Have a Common Pin, but not GNDInterface 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 supplyInstructions: 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.E: SSB_OFFSET: Fine adjustment of SSB working mode. Use the encoder switch to adjust the value and press the STEP key. Press CAL and then quickly release to go to step F.F: CW_OFFSET: Fine adjustment of CW working mode. Use the encoder switch to adjust the value and press the STEP key. Press CAL and then quickly release to go to step G.G: OFFSET_FREQ: offset frequency setting. For example, set to 9MHz or 10.7MHz, use the encoder switch to adjust the value and follow the STEP key. Press CAL and then quickly release to go to step H.H: MULTIPLIER: Multiplier setting. Should be set to 1, press CAL and then quickly release to enter step I:I: The word "SAVE" is displayed on the screen, and the above settings are automatically saved and normal operation is restored..Package List:1 x Signal Generator1 x User ManualNote:Please use according to the parameter voltage