Elecraft KX1 Manual - Manual (Page 67)

66
E
LECRAFT
Advanced Operating Features
Recording and Playing CW Messages
The KX1 provides two message memories of 48 bytes each. CW
messages can only be recorded using the KX1’s internal keyer.
Set INP to PDn or PDr to use the internal keyer.
To Record: Tap M E N U
and locate the PLY menu entry, change it to
REC by holding
E D I T
, then tap either
1
or
2
. The display will show
0 4 8 , indicating that 48 bytes of storage are available in this buffer.
This number will count down toward 0 as long as you are sending.
Whenever you stop sending completely, up to two standard-length
word spaces will be inserted. To stop recording, tap any switch. If you
do this before starting to send, the original message contents will be
preserved.
To Play: Tap M E N U
and locate the PLY menu entry, then tap either
1
or
2
. Message play can be canceled at any time by hitting any key or
by tapping the keyer paddle. You can also change the keyer speed
while messages are playing using the VFO knob.
To use Auto-Repeat: Locate the P L Y menu entry as before, but then
hold either
1
or
2
. The message will then play back continuously until
you tap another switch or hit your key or paddle. You'll see RPT on
the display between message transmissions.
Setting the Auto-Repeat Interval: The length of the pause between
messages during auto-repeat can be programmed using the RPT menu
entry (0-255 sec.). Long delays are useful for beacons.
Keyer Test Mode: To play back messages without transmitting, use
keyer test mode. In this mode, you'll see P=0 on the LED during
message play, rather than the transmit bargraph. To turn keyer test
mode on/off, locate the PLY menu entry, then tap the VFO knob.
You'll see P=0 and nor on alternate taps.
Receive Mode Selection (CW, LSB, USB)
The KX1 provides three receive modes: CW (nor or "normal"),
L S B
, and USB. Hold
M E N U
+
R I T
to select the desired mode.
In CW (nor) receive mode, LSB is used on 40 meters, and USB is
used on 30 and 20 meters. In this mode a CW offset is introduced on
receive, which means that you must match received-signal pitch to
your sidetone pitch to determine a station's carrier frequency. CW
mode also provides a 1 kHz fast VFO tuning rate, compatible with
ham-band tuning.
L S B and USB receive modes have no receive CW offset, so the
VFO will show a station's carrier frequency when a voice signal is
tuned in properly (SSB) or when a carrier is zero-beated (AM or CW).
The required CW offset is instead introduced on transmit. These
modes also provide a 5 kHz fast VFO tuning rate, useful for tuning
SWL band segments.
Cross-mode (CW/SSB) operation: Cross-mode contacts can be made
in all three of the KX1's receive modes, without the need to use RIT.
When an SSB signal is correctly tuned in, and you transmit, the SSB
station will hear you at about a 600-Hz pitch.
Receiver performance considerations: Several strong internally-
generated signals can be heard outside of the ham bands
7 . If one of
these signals falls near an AM signal of interest, try switching
sidebands to reduce interference. Note: on 20 meters, USB and nor
(CW) receive modes provide somewhat better sensitivity than LSB
mode. See Circuit Details for an explanation.
7 These signals originate either at the DDS or from mixing products, and are
typical for a superhet receiver using a low I.F. Strong signals appear at the
following frequencies, in kHz, with the applicable sideband shown in
parentheses: 5895 (USB), 6141 (USB), 6358 (LSB), 6550 (USB), 7989
(LSB), 9148 (both), 9826 (both), 14740 (both), 14981 (both). Additional
weak signals can also be heard, but in general will be masked by band noise.