Specifications

ManualsBrandsMDS ManualsAmplifierMosfet C2

Calibration

Most calibration steps are performed at the

factory for both kit and assembled KX3s.

There is one exception: If you install a KXFL3

roofing filter after initial purchase, you’ll need to

perform the Receive Sideband calibration step

(pg 32).

Viewing tech-mode menu entries: To view the

menu entries used during calibration, hold MENU,

then rotate

OFS / VFO B to locate the TECH

MD menu entry. Use VFO A to change the

parameter to ON.

To unlock the parameter for a tech-mode menu

entry: Hold KHZ until you see the lock symbol

( ) turn off (about 3 seconds).

Reference Frequency

Using the calibration procedure below, you can

achieve accuracy of better than +/- 1 ppm. This

procedure requires a stable signal generator, or an

on-air signal at a known frequency, such as WWV

at 5, 10, or 15 MHz. The carrier of a commercial

AM broadcast station can also be used.

During the procedure, you’ll have a choice of

two methods for adjusting the reference frequency:

(1) automatic tuning, or (2) manual tuning.

Method (2) may be slightly more accurate but

requires “zero-beating” of two signals, which some

operators may find difficult to do.

! Select CW mode by tapping MODE.

! Hold MENU. Rotate OFS / VFOB to find

the DUAL RX menu entry. Set it to OFF, then

exit the menu.

! If you’re connecting a signal generator to the

antenna jack, set PWR to 0.0 watts to avoid

accidental damage to the generator.

! Use direct frequency entry (pg. 10) to set VFO

A to the exact frequency of your signal

generator or on-air signal source. This will also

switch the KX3 to the required band.

! Set AF gain for a comfortable listening level.

You should be able to hear a carrier.

! Method 1 (automatic tuning): Hold CWT.

The upper half of the S-meter becomes a tuning

aid, with the CWT icon turned on. This enables

the auto-spot function to be used below.

Method 2 (manual tuning): This method

requires manually matching the pitch of the

received signal to the CW sidetone pitch using

SPOT. To prepare for this, you may need to

increase sidetone volume. See pg. 12.

! Locate the I/II icons (right end of the filter

passband graphic). If function II is selected, tap

PBT I/II to select function I (bandwidth).

! Rotate the PBT I/II control to set the

bandwidth to 0.30 kHz (BW 0.30).

! Tap PBT I/II to switch to function II (shift).

! Rotate the PBT I /II control until the filter

passband is centered in the filter graphic.

! Hold MENU, then rotate OFS / VFOB to

locate the REF CAL menu entry.

! Hold KHZ for about 3 seconds to unlock the

parameter (shown on VFO A).

! If you see only 7 digits, tap RATE.

! In case you decide to restore the factory setting,

write down the full 8-digit parameter value:

_________________ .

! Method 1 (automatic tuning, CWT on): Tap

SPOT to auto-spot the signal. The REF CAL

parameter value should automatically move up

or down a small amount. When it finishes

moving, the bar directly beneath the CWT icon

should be turned on as shown below. The

reference will then be closely calibrated.

Method 2 (manual tuning, CWT off): Tap

SPOT and manually adjust the REF CAL

parameter using VFO A until the received

signal pitch matches the sidetone pitch. Adjust

for zero-beat.

! If you have difficulty with this procedure, or if

you’re not sure that it worked correctly, set the

parameter value to its original value (recorded

above) using VFO A.

! If you have adjusted the REF CAL value more

accurately, write down the new value (8 digits)

here for future reference: ______________ .

! Exit the menu by holding MENU.

! Save your configuration using KX3 Utility.

100

SWR

CWT