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Elecraft KXAT2 Automatic Antenna Tuner
Introduction
The KXAT2 internal automatic antenna tuner converts a wide range of impedances presented by antennas to a
value close to 50 ohms, non reactive (i.e. low SWR) for the KXAT2 itself. This allows the transmitter in the KX2
to deliver full RF power in transmit and can also improve sensitivity in receive.
Even many non-resonant "random" wire antennas can be used effectively with the KXAT2 installed.
When commanded to tune, the KXAT2 searches for the best match (lowest SWR to the transmitter). Once a
tuning solution has been located, the solution is stored so that retuning requires less than 1 second. One tuning
solution is stored for each band.
The KXAT2 is a single pc board (see below) that fits inside the KX2 enclosure.
If you would like Elecraft to install this modification for you, contact Elecraft technical support at
k3support@elecraft.com
A modification was released shortly after KX2 production began that further reduces
harmonic energy in the transmitter output. If you have an early KX2 that has not been
modified, it is most conveniently done while installing the KXAT2. The necessary parts are
included with this kit. No soldering or special tools are required. Simply follow the steps
that refer to installing the modification where you encounter them in the following
ESD-Sensitive! A grounded wrist strap and ESD dissipating mat are recommended
whenever you work inside your K3. Optionally, touch a bare metal ground frequently while
working.
Installation Instructions
Revision B, June 26, 2017
Copyright © 2017, Elecraft, Inc. All Rights Reserved
or call 831-763-4211.
KXAT2 Antenna Tuner Option Circuit Board
Elecraft
•
www.elecraft.com
E740294
IMPORTANT!
•
831-763-4211
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Table of Contents
Related Manuals for ELECRAFT KXAT2
Summary of Contents for ELECRAFT KXAT2
- Page 1 The KXAT2 internal automatic antenna tuner converts a wide range of impedances presented by antennas to a value close to 50 ohms, non reactive (i.e. low SWR) for the KXAT2 itself. This allows the transmitter in the KX2 to deliver full RF power in transmit and can also improve sensitivity in receive.
- Page 2 With the KX2 face down, loosen the two thumb screws and carefully remove the bottom cover as shown in Figure 1. Take care to avoid pulling on the cable leading to the speaker. Figure 1. Opening the KX2. KXAT2 Installation Instructions Page 2 of 6...
- Page 3 K3 Harmonic Reduction Instructions included with this kit and install the modification starting with Figure 2 and the associated step on page 2. Stop after installing the copper tape as shown in Figure 5 on page 4 and resume installing the KXAT2. Figure 2. Checking for the Harmonic Suppression Modification.
- Page 4 Position the KXAT2 board as shown over the area of the KX2 RF module between the KXBPF board and then end. Connector J1 on the KXAT2 board plugs into J1 on the RF module shown inFigure 4. When J1 is properly mated the hole for the screw and washer will be aligned over the spacer.
- Page 5 Figure 6. Finishing the KXAT2 Installation Plug the cable from the antenna connector P1 on the KXAT2 board as shown in Figure 6. If used, replace the internal battery and plug it in as shown in Figure 1 on page 2.
- Page 6 Elecraft products transferred by the purchaser to a third party, either by sale, gift or other method, who is not disclosed to Elecraft at the time of original order, are not covered by this warranty. If the Elecraft product is being bought indirectly for a third party, the third party's name and address must be provided to Elecraft at time of order to insure warranty coverage.
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