Specifications

48
Calibration Procedures
All calibration procedures are firmware-
based. Please do not adjust any of the trimmer
capacitors or potentiometers inside the K3; they
have been carefully aligned at the factory.
Most calibration procedures use Tech-Mode menu
entries. To enable these, set CONFIG:TECH MD
to ON. Set TECH MD to OFF afterward.
Synthesizer
This procedure is normally done at assembly time
or by the factory.
 Hold C ONF I G and find the CONFIG:VCO
MD menu entry. Set the parameter fully
clockwise to CAL. Exit the menu. The
synthesizer will be tested and calibrated.
 To calibrate the 2
nd
synthesizer (for the sub
receiver), locate CONFIG:VCO MD and set
the parameter to CAL, tap SUB to turn on the
SUB icon,then exit the menu.
Wattmeter
If desired, power readings shown during TUNE can
be adjusted to match an external wattmeter.To
account for all K3 circuitry involved, this must be
done at 5.0 W, at 50 W (K3/100 only), and at 1.00
mW if the KXV3 option is installed.
Low-Power (5 W) Wattmeter Calibration
 Switch to 20 meters.
 Put the ATU into bypass mode (hold ATU ).
 Connect a 50-W capable dummy load (5 W for
K3/10) and an accurate wattmeter to ANT1.
 Switch to ANT1 by tapping AN T .
 Set power to exactly 5.0 watts.
 Hold C ONF I G and locate the CONFIG:WMTR
LP menu entry.
 Hold TUNE; adjust menu parameter for a
reading of 5.0 W on the external wattmeter.
Thentap XMI T to exit TUNE.
 Tap MENU to exit the menu.
High Power (50 W) Wattmeter Calibration
This applies to the K3/100 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.
1.0 Milliwatt Meter Calibration (KXV3)
This applies only if you have the KXV3 option.
 Set the CONFIG:KXV3 menu entry to TEST,
forcing all bands to use the KXV3’s transverter
output jack. Power will be limited to 0-1.5 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:KXV3 back to NOR.
Transmitter Gain
This procedure is normally done at assembly time
or by the factory. It compensates for per-band
transmit gain variation, and must be done on every
band. (The resulting calibration data can be viewed
using CONFIG:TXGN, but this is not necessary.)
Low-Power (5 W) TX Gain Calibration
 Switch to 160 meters.
 Put the ATU into bypass mode (hold ATU ).
 Connect a dummy loadto ANT1.
 Switch to ANT1 by tapping AN T .
 Set power to exactly 5.0 watts. (Make sure
CONFIG:PWR SET is set to NOR so power
on all bands can be set one time using the PWR
control.)
 Hold TUNE ; VFO B should show about 5 W
 Tap XMI T to exit TUNE.
 Repeat this procedure on 80-6 meters.