DDS VFO 2 Construction Manual – Issue 1
Page 23
9.6
F
REQUENCY CALIBRATION
1.
Measure the actual DDS output frequency and compare this to the frequency displayed
on the LCD. Note the difference.
2.
If the DDS output frequency is less than the displayed frequency, the difference needs to
be subtracted in the Freq Calibrate configuration.
3.
If the DDS output frequency is greater than the displayed frequency, the difference
needs to be added in the Freq Calibrate configuration.
4.
Pressing the encoder button for less than 1 second will toggle the sign indicator.
5.
Rotating the encoder will increase or decrease the difference value.
6.
Once set press the encoder button for longer than 1 second.
9.7
V
OLTAGE DISPLAY CALIBRATION
1.
Measure the power supply voltage and compare this to the voltage displayed on the LCD.
Note the difference.
2.
If the power supply voltage is less than the displayed voltage, the difference needs to be
subtracted in the Volts Calibrate configuration.
3.
If the power supply voltage is greater than the displayed frequency, the difference needs
to be added in the Volts Calibrate configuration.
4.
Pressing the encoder button for less than 1 second will toggle the sign indicator.
5.
Rotating the encoder will increase or decrease the difference value.
6.
Once set press the encoder button for longer than 1 second.
Summary of Contents for DDS VFO 2
Page 1: ...DDS VFO 2 Construction Manual Issue 1 Page 1 DDS VFO 2 CONSTRUCTION MANUAL ...
Page 7: ...DDS VFO 2 Construction Manual Issue 1 Page 7 Figure 1 CPU ...
Page 8: ...DDS VFO 2 Construction Manual Issue 1 Page 8 Figure 2 DDS generator ...
Page 9: ...DDS VFO 2 Construction Manual Issue 1 Page 9 Figure 3 LCD Rotary Encoder and Power Supply ...
Page 14: ...DDS VFO 2 Construction Manual Issue 1 Page 14 Figure 4 Component overlay ...
