Calibration Procedures
All calibration procedures are firmware-
based. Please do not adjust any of the trimmer
capacitors or potentiometers inside the K3S.
Be sure to save your configuration using
K3 Utility each time you change menu settings.
Most calibration procedures use Tech-Mode menu
entries. To enable these, set CONFIG:TECH MD
to ON. Set TECH MD to OFF afterward.
Synthesizer
The KSYN3A synthesizer used in the K3S does not
require calibration.
Wattmeter
Before doing wattmeter or transmit gain
calibration, set both CONFIG:TUN PWR and
PWR SET to NOR.
If desired, TUNE power readings can be calibrated.
This must be done at 5.0 W, 50 W (K3S/100 only),
and 1.00 mW.
Low-Power (5 W) Wattmeter Calibration
• Switch to 20 meters. If applicable, put the ATU
into bypass mode (hold ATU).
• Connect a 50-W capable dummy load (5 W for
K3S/10) and an accurate wattmeter to ANT1.
• Switch to ANT1 by tapping ANT .
• Set power to exactly 5.0 watts.
• Hold CONFIG and locate the WMTR LP menu
entry. Stay in the menu for the next step.
• Hold TUNE; adjust menu parameter for a
reading of 5.0 W on the external wattmeter.
Then tap XMIT to exit TUNE. Exit the menu.
High Power (50 W) Wattmeter Calibration
This applies to the K3S/100 only. Use the same
procedure as shown for 5 watts, but set power to 50
W. The wattmeter calibration menu entry name will
change to CONFIG:WMTR HP.
Milliwatt-meter Calibration (XVTR OUT)
• Set the CONFIG:KXV3B menu entry to
TEST, forcing all bands to temporarily use the
KXV3B’s transverter output jack. Power will
be limited to 1.5 mW. The wattmeter
calibration menu entry name will change to
CONFIG:WMTR MW .
• Connect a dummy load and an accurate RF
voltmeter to the XVTR OUT jack.
• Set power to exactly 1.00 milliwatts (0 dBm).
• Hold TUNE; adjust the WMTR MW menu
parameter for 0.224 Vrms on the external
voltmeter. Then tap XMIT to exit TUNE.
• Set CONFIG:KXV3B back to NOR.
Transmitter Gain
This procedure is normally done at assembly time
or by the factory. It compensates for per-band TX
gain variation, and must be done on every band.
If a computer is available, you should use the
automated version of the below procedure. Run
K3 Utility and click on the Calibration tab.
Low-Power (5 W) TX Gain Calibration
• Switch to 160 meters.
• Put the ATU into bypass mode (hold ATU).
• Connect a dummy load to ANT1.
• Switch to ANT1 by tapping ANT .
• Set power to exactly 5.0 watts.
• Hold TUNE ; VFO B should show about 5 W.
• Tap XMIT to exit TUNE.
• Repeat this procedure on 80-6 meters.
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