Elecraft KXAT3 User Manual
Elecraft® KX3
KXAT3 Wide Range Internal Antenna Tuner
Installation Instructions
Revision A, June 11, 2012
Copyright © 2012, Elecraft, Inc., All Rights Reserved
Introduction
The KXAT3 antenna wide range tuner plugs into existing connectors inside the KX3. The KXAT3 stores the
settings found for the best match at multiple points across each band, allowing for quick frequency and band
changes. The KXAT3 also includes an automatically tuned filter for the AM broadcast band that tracks the
VFO, improving image rejection for signals in the 0.3-1.0 MHz range.
CAUTION
The KXAT3 module and many components inside your KX3 may be damaged by
Electrostatic Discharge (ESD) simply by touching them or a circuit board containing
them unless you take specific steps to prevent such damage. See Preventing
Electrostatic Discharge Damage on page 1 before opening the package containing the
KXAT3 module or working inside your KX3.
Installing the KXAT3 Module
Preparing for Installation
Preventing Electrostatic Discharge Damage
ESD damage may occur with static discharges far too little for you to notice. A damaged component may not
fail completely at first. Instead, the damage may result in below-normal performance for an extended period of
time before you experience a total failure.
We strongly recommend you take the following anti-static precautions (listed in order of importance) to ensure
there is no voltage difference between the components and any object that touches them:
Leave the KXAT3 module in its anti-static packaging until you install it.
Wear a conductive wrist strap with a series 1-megohm resistor that will constantly drain off any static
charge that accumulates on your body. If you do not have a wrist strap, touch a ground briefly before
touching any sensitive parts to discharge your body. Do this frequently while you are working. You can
collect a destructive static charge on your body just sitting at the work bench.
WARNING
DO NOT attach a ground directly to yourself without a current-limiting resistor as this poses a
serious shock hazard. A wrist strap must include a 1-megohm resistor to limit the current flow. If
you choose to touch an unpainted, metal ground to discharge yourself, do it only when you are
not touching live circuits with any part of your body.
1
Use a grounded anti-static mat on your work bench (see below).
If you pick up a pc board that was not placed on an anti-static mat or in an anti-static package, touch
first a ground plane connection on the board such as a connector shell or mounting point.
If you use a soldering iron to work on a circuit board, be sure your iron has an ESD-safe grounded tip
tied to the same common ground used by your mat and wrist strap.
Choosing an Anti-Static Mat
An anti-static mat must bleed off any charge that comes in contact with it at a rate slow enough to avoid a shock
or short circuit hazard but fast enough to ensure dangerous charges cannot accumulate. Typically, a mat will
have a resistance of up to 1 Gigaohm (10
recommend that you choose an anti-static mat that comes with published resistance specifications and clean it as
recommended by the manufacturer. Testing has shown that many inexpensive mats that do not specify their
resistance have resistance values much too high to provide adequate protection, even after they were cleaned
and treated with special anti-static mat solutions.
Suitable anti-static table mats are available from many sources including:
U-line (Model 12743 specified at 10
Desco (Model 66164, specified at 10
TM
3M
Portable Service Kit (Model 8505 or 8507, specified at 106 to 109 ohms)
9
ohms). Testing a mat requires specialized equipment, so we
7
ohms)
6
to 108 ohms)
Tools Required
1. ESD Protection (see Preventing Electrostatic Discharge Damage, pg 1).
2. #1 size Phillips screwdrivers. To avoid damaging screws and nuts, a power screwdriver is not
recommended.
3. Soft cloth or clean, soft static dissipating pad to avoid scratching the enclosure.
Parts Supplied
Be sure you have the following components in your kit. If anything is missing, contact Elecraft customer
support (pg 5).
ILLUSTRATION DESCRIPTION QTY.
KXAT3 Module
ESD SENSITIVE! Leave it in its
1 E850500
anti-static envelope until it is
installed.
4-40, 3/16” (4.8mm) Black Pan Head
Screw
2 E700172
ELECRAFT
PART NO.
#4 Lock Washer, Split Ring 2 E700004
2
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