1、Support 0-55MHz continuous adjustment, the frequency is 1Hz. 2、The generator has a 78L05 voltage regulator. When the input current is 200MA, the input voltage of 8-9V will be the ideal voltage. 3、The 12V input voltage can only be used for short-term testing, otherwise it will cause the board to heat up. 4、5p/6p connect to encoder as per photo. 7p of the middle connects to digital matrices input. 14p (8V GND) is 8V power supply from main board. 5、If powered by the motherboard, the DDS does not require a separate power supply. 6、1 to 6 correspond to 6 frequency bands: 8, 7, 9, 14, 18 or 21, 27 or 29. 7、ISB, USB, CW are the three mode choices. 8、DT is a signal from main board. 1 x Signal Generator Item Type: Signal GeneratorDisplay: 1602 LCDInput Voltage: DC 8V-9VInput Current: 200mAFrequency Range: 0-55MHz6 Bands: 3.8, 7, 9, 14, 18 Or 21, 27 Or 29Product Size: Approx. 80 x 45 x 30mm / 3.15 x 1.77 x 1.2inKeys and Connection Interfaces:ENC: Encoder switchMEM: Switch for memory modeVFO: Transfer from VFO A to VFO B, or from VFO B to VFO A.SSB: Working mode change: circulate from USB, LSB, AM, CW, then keep looping...RIT: Fine tuning to receiving frequencyCAL: Set functionsKB-1 and KB-2 have common shared pin, but is not GND