Synthesizer calibration – Elecraft K3 Assembly Manual User Manual

Page 71

If you checked the “Yellow Dot” box on page 28 while inspecting the KIO3 Audio Board, do the

following. Otherwise skip this step and proceed to Synthesizer Calibration below. The headphone jack on the
KIO3 Audio Board uses an inverted speaker cut-off logic that prevents speaker audio with the default firmware
setting. Change the firmware setting as follows:

 Hold the

C O N F I G

switch at least 1/2 second to bring up the configuration menu on the LCD.

 Rotate the VFO B knob (the knob marked to the right of the main tuning knob) until

SPKR+PH

appears in the lower right area of the LCD.

 Tap the

switch on the numeric keypad to the right of the LCD until you see

PH.R SW

followed by a + sign.

 Tap the

switch again and note that the sign changes to ̶ , indicating it is set for the inverted

logic. This is a toggle; if you tap the

switch again the sign will change back to +. Be sure the

sign is ̶ for KIO3 Audio boards with a yellow dot.

 Tap the

M E N U

switch to exit the configuration menu and confirm that you have noise in the

loudspeaker when the

AF GAIN

knob is rotated clockwise.

Synthesizer Calibration

Hold

C O N F I G

to access the configuration menu, then rotate VFO B to display TECH MD. Set the TECH

MD parameter to ON with VFO A.

Refer to the Calibration Procedures in you Owner’s Manual and perform the Synthesizer calibration.

When the calibration process is completed, press the BAND switch to cycle through all the bands from 160

meters through 6 meters and verify that there are no CAL PLL error messages on the display. That indicates that
the synthesizer is calibrated on all the bands.