19
Transmit Settings
The Transmit controls group (to the left of the VFO A
knob) is used to set up the KX2’s transmitter. The
nearby TX LED turns on during transmit.
This section provides an overview of transmit
controls. Detailed per-mode instructions follow.
Keyer Speed-Spot/Mic Gain and Power Output
In CW mode,
KYR- SPT/MIC sets the keyer speed
(in WPM). Tapping the knob spots a signal (pg. 21). In
SSB mode, this knob sets mic gain. A typical seting is
15-25 for use with the Elecraft MH3 microphone.
Holding this knob for ~0.5 seconds selects
PWR
(power output control). Power level is shown on the
RF bar graph during transmit. Maximum power output
is typically 10 W on 80-17 m, and 8 W+ on 15-10 m.
A power supply voltage of 12 V or higher is
recommended for SSB use at full power.
If a KXPA100 amplifier is connected, power can be
set up to 100 W (see KXPA100 owner’s manual).
The right side of the KX2 may become quite
warm during transmit. If the amplifier temperature is
too high, power will be automatically reduced.
Maximum power output varies with supply
voltage and other factors. If output is lower than
expected, use the special VFO B displays (pg. 23) to
check supply voltage, current drain, and PA
temperature. The selected parameter will be shown on
VFO B during TUNE. (SWR is shown on VFO A.)
Transmit Controls and ATU Tuning
Tap
AF/MON to set the transmit monitor volume
(speech in voice modes, sidetone in CW mode).
XMIT switches from receive to transmit. However, in
CW modes, MENU:VOX MD is usually set to ON, so
you can simply hit the key or keyer paddle to transmit.
(VOX is always on in PSK-D/FSK-D modes.) In SSB
mode, tapping XMIT is an alternative to using mic PTT
or VOX. (See pg. 20 for SSB VOX setup.)
TUNE is used to transmit a CW signal at the power
level selected by the
PWR control. This is useful
with external wattmeters and antenna tuners. The
TUN PWR menu entry can be used to override the
PWR control setting and transmit at a lower level.
ATU starts automatic antenna matching if a KXAT2
internal ATU is installed (pg. 19), or if a KXPA100
amp with KXAT100 ATU is connected (pg. 33).
MENU:ATU MD must be set to AUTO. Matching
takes an average of 4 seconds, initially. Settings are
recalled on band change, or when you transmit after
moving the VFO a significant distance. The ATU icon
flashes briefly when settings are recalled. In CW mode,
recall is delayed until a pause in keying. Also see
MENU:ATU DATA for selection of ATU data sets.
With difficult loads, try tapping ATU a second
time within 5 seconds to search for a lower SWR.
PFn (programmable functions): See pg. 25.
MSG and REC are used to play and record CW, data,
or digital voice messages (pgs. 22 and 30).
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