Elecraft KX1 Manual - Manual (Page 69)

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LECRAFT
tone, or low/high tone (for 10 Hz, 100 Hz, and 1 or 5 kHz VFO
steps, respectively). Frequency Announce mode is turned on in the
same was as S-meter mode (hold the DISP switch combination,
B AN D
+
R I T
). When you select announce mode, AF (for
announce frequency) will be displayed, and the letter A will be
sent in CW. Holding the DISP switch combination again will
switch to battery display mode (B) and back to normal mode (N).
Switch CW: Sending CW using Front-Panel Switches
In an emergency, the
B AN D
switch can be used as a hand key, or the
B AN D
and
R I T
switches can be used as a keyer paddle. To enable this
feature, first use the INP menu entry to specify hand key (HND) or
one of the paddle modes (PDn / PDr). Next, press and hold the
M E N U
switch and
1 0 / 1 0 0
simultaneously to toggle Switch CW on
and off. You’ll see btn (“button”) when switch CW is on, and Pdl
(“paddle”) when it is off.
When switch CW is enabled and INP is set to HND (hand key), the
normal functions of the
B AN D
/
W P M
switch are not available. In
addition, if INP is set to PDn or PDr, the functions of the
R I T
/
C L R
switch are not available. To use the normal functions of these
switches, turn off Switch CW mode as described above.
VFO Lock/Unlock
Holding RIT + 10/100 locks (LOC) or unlocks (nor) the VFO knob.
When the VFO is locked, rotating the knob will have no effect on the
VFO frequency or RIT offset, and tapping or holding the knob will not
change the tuning rate. The knob can still be used for changing the
CW keying speed or accessing the menu.
Operating Frequency Calibration
The KX1's VFO display accuracy should be about +/- 200 Hz without
calibration. Using the BFO and DDS calibration procedures below,
you can improve accuracy to typically +/- 10 Hz.
Before calibration, the KX1 should be turned on and allowed to
stabilize at room temperature for 15 minutes.
BFO Calibration: This procedure compensates for the difference
between your BFO frequency and the nominal value (4913.00 kHz).
1. Select 40 or 30 meters, LSB receive mode.
2. In the menu, set BFO to .00, and DDS to 00. Exit the menu.
Tune in a strong station at a known frequency as accurately as
possible. You can zero-beat an unmodulated carrier (tune for 0 Hz
audio pitch), or tune in an AM broadcast or reference station such as
WWV. Write down the frequency shown on the dial.
4. Switch to USB, re-tune the signal, and write down this frequency.
5. Subtract the lower reading from the higher reading, then divide the
result by two. Example: USB = 10000.10 kHz, LSB = 9999.90
kHz. Subtracting LSB from USB leaves 0.20 kHz, and dividing by
2 yields 0.10 kHz. This is the BFO correction.
6. If the LSB reading was the lower of the two, set the BFO menu
parameter to the BFO correction value (in this example, .10). If the
USB reading was the lower one, set the BFO parameter to the
negative of the correction (in this example, - . 1 0 ).
7. Exit the menu. You should now be able to switch between LSB and
USB receive modes without re-tuning the VFO.
DDS Calibration: This procedure compensates for any error in the
50-MHz reference oscillator. The BFO calibration procedure, above,
must be performed first.
1. Select 40 or 30 meters and LSB or USB receive mode. Don't
use CW (nor) mode, as this introduces a receive offset.
2. Tune the VFO to the exact specified frequency of a reference
signal. Example: For WWV at 10 MHz, you must tune to exactly
10000.00 kHz as indicated on the KX1's display. You might start
with 5 kHz steps (hold the VFO knob), but then switch to 100 Hz
and finally 10 Hz steps as you get closer (by tapping the knob).
3. Edit the DDS menu parameter. While listening to the reference
signal, use the VFO knob to adjust the parameter so that the signal
is properly tuned in. If it is an unmodulated carrier, tune for zero-