DDS Calibration
This operation wil reset the 20 frequency memories to their original default values and allow
calibration of the DDS frequency.
Turn off power. Simultaneously press V/M/SAV and RIT/MOD, turn on power, and hold down the
two keys until the display appears as shown below then release the keys.
After a few seconds, the HB-1A will enter the DDS calibration mod and the display will appear as
below.
With a frequency counter connectedto the DDS test point, turn the Tuning knob until the counter
reads the same as the HB-1A display. Press RIT/MOD to exit, then V/M/SAV to finish.
Voltmeter Calibration and Sidetone Adjustment
Adjust VR1 so that the voltage displayed is the same as that measured with an accurate external
voltmeter.
Adjust VC to set the sidetone frequency to 700 Hz.
