DDS Signal Generator AD9850 6 Bands 0~55MHz Digital Shortwave Radio

Features This is a 0 55MHz DDS Signal Generator It is based on AD9850 chip and is very easy to operate Supports 0 55MHz continual adjust at 1Hz step This generator has 78L05 voltage regulate Input current at 200MA input voltage 8 9V would be the ideal voltage Input voltage of 12V can only be used for short time testing otherwise will cause heat to board 5p 6p connect to encoder as per photo 7p of the middle connects to digital matrix input 14p 8V GND is 8V power supply from main board If powered by main board DDS does not need independent power supply 1 6 correspond to 6 frequency bands 3 8 7 9 14 18 or 21 27 or 29 ISB USB CW are the three mode choices DT is signal from main board KeysConnection 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 and on and on RIT Fine tuning to receiving frequencyCAL Set functionsKB 1 and KB 2 have common shared pin but is not GNDHow to operate Press CAL power on then we enter setting screen Let go release CAL A ENABLE 6XREFCLE setting chip clock mode adjust frequency encoding setting AD9851 set to 6 multiply frequency AD9850 set to 1multiply frequency Press CAL then quickly release to enter next step B B DDS SYSTEM CLK Chip working frequency setting Use encoder switch to adjust value Operate in accordance with STEP key AD9851 set at oscillator 6 multiply channel AD9850 set at actu