ELECRAFT K3, Owner'S Manual

Page: 48 / 78

48
Calibration Procedures
All calibration proce dures are firmware-
base d. Ple ase do not adjust any of the trimme r
capacitors or potentiomete rs inside the K3; they
have been carefully aligne d at the factory.
Most calibration procedures use Te ch-Mode menu
entries. To enable these, set CONFIG:TECH MD
to
O N
. Set TECH MD to
O FF
afterward.
Synthesizer
This procedure is normally done at assembly time
or by the factory.

Hold
C O NF I G
and find the CONFIG:VCO
MD
menu entry. Set the parameter fully
clockwise to CAL. Exit the menu. T he
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
S UB
to turn on the
S UB icon, then exit the menu.
Wattmeter
If desired, power readings shown during
TU N E
can
be adjusted to match an external wattmeter. T o
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 ANT 1 by tapping
AN T
.

Set power to exactly 5.0 watts.

Hold
C O NF I G
and locate the CONFIG:WMTR
LP menu entry.

Hold
TU N E
; adjust menu parameter for a
reading of 5.0 W on the external wattmeter.
Then tap
X MI T
to exit T UNE.

T ap
ME NU
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
TE S T
,
f or ci ng al l bands t o us e t he KXV3’ s t r ans ver t er
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 XVT R OUT jack.

Set power to exactly 1.00 milliwatts (0 dBm).

Hold
TU N E
; adjust the WMTR MW menu
parameter for 0.224 Vrms on the external
voltmeter. Then tap
X MI T
to exit T UNE.

Set CONFIG:KXV3 back to
NO R
.
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 e ve ry
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 load to ANT 1.

Switch to ANT 1 by tapping
AN T
.

Set power to exactly 5.0 watts. (Make sure
CONFIG:PWR SET
is set to NO R so power
on all bands can be set one time using the PWR
control.)

Hold
TU N E
; VFO B should show about 5 W

T ap
X MI T
to exit TUNE.

Re peat this proce dure on 80-6 me ters.