ELECRAFT KX2 - Receive Opposite Sideband; Transmit Bias; Transmit Gain; Automated Transmit Gain Calibration

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Receive Opposite Sideband
Receive sideband calibration nulls (rejects) the
opposite-sideband image. This image is a weak audible
side-effect of listening to very strong signals.
This procedure is normally done only at the
factory. Instructions available on request.
Transmit Bias
This automated procedure sets the transmit bias current
of the 10 W amplifier stage to ensure low distortion.
§ Make sure nothing is connected to the KX2’s
antenna jack.
§ Hold MENU, then rotate OFS/B to locate the
TX BIAS menu entry. Hold FREQ for about 3
seconds to unlock the two parameters. Note: These
parameters cannot be manually adjusted.
§ Select CW mode by tapping MODE.
§ Tap XMIT to start CW bias calibration. This may
take 3-10 seconds. If an error message appears at
the end (ERR nnn), see Troubleshooting.
§ Select SSB mode (LSB or USB) by tapping
MODE.
§ Tap XMIT to start SSB bias calibration.
§ Exit the menu by tapping DISP.
§ Save your configuration using KX2 Utility.
Transmit Gain
This procedure compensates for per-band transmit gain
variations. An 11-14 V power supply or battery is
required, as well as a 6-W (or higher) dummy load.
Automated Transmit Gain Calibration
To use automated gain calibration (recommended),
connect the KX2 to a computer, run KX2 Utility, and
select the Calibration tab. Click on Calibrate
Transmitter Gain. Follow the on-screen instructions.
Manual Transmit Gain Calibration
§ Use direct frequency entry (pg. 15) to set the
KX2’s operating frequency to 3.7 MHz (80 m).
§ If you have the KXAT2 ATU option installed, put
it into bypass mode using MENU:ATU MD. Set
the TUN PWR menu entry to NOR. Exit the meu.
§ Connect a 6-W dummy load to the BNC jack.
§ Set PWR to exactly 6.0 watts (pg. 19).
§ Hold TUNE; wait until VFO B shows 6 .0 W.
§ Tap XMIT to exit TUNE.
§ Repeat the above procedure on 60-10 meters.
Use approximately the following frequencies: 5.4
MHz (60 m), 7.1 MHz (40 m), 10.1 MHz (30 m),
14.1 MHz (20 m), 18.1 MHz (17 m), 21.2 MHz
(15 m), 24.9 MHz (12 m), and 28.8 MHz (10 m).
§ Save your configuration using KX2 Utility.