Elecraft • www.elecraft.com • 831-763-4211
Elecraft KX2
Harmonic Level Reduction
E740304
Revision B, June 7, 2017
Copyright © 2017, Elecraft, Inc. All Rights Reserved
Introduction
This modification reduces the level of harmonics present in the KX2 output for early KX2 transceivers. No
soldering is required. If you prefer, Elecraft can install the modification for you. E-mail k3support@elecraft.com
or call 863-763-4211.
Has my KX2 Been Modified?
You can check to see if the modification is installed by opening the case as if you were changing the battery (see
Figure 1 on page 2). Inspect the transistors mounted on the end panel near the antenna connector (see Figure 7 on
page 5). If the thermal insulator is present between the transistor heat sinks and the end panel, or if you can see a
copper strip connecting the two heat sinks (when no KXAT2 is installed) the modification has been done.
Parts Required
You can order a kit containing the required parts from Elecraft. Order KX2MDKTHS
Copper Tape
Do not remove from backing until
instructed to do so.
Foam Tape
Do not remove from backing until
instructed to do so.
Thermal Insulator
Both insulators may be supplied on
the same paper backing.
Do not remove from backing until
instructed to do so.
Shoulder Enhanced
in Image
Nut, 4-40, 0.062” (1.6 mm) Thick
#4 Lock Washer, Internal Tooth
Tools Required
1. A No 1 Phillips-head screwdriver.
2. Thin nose (1/8” or 3 mm) pliers to hold nuts with limited clearance space (see Figure 7, page 5).
3. A small rule (see Figure 4, page 3).
4. A soft surface that you can lay the KX2 on without scratching the LCD cover or case.
5. A grounded wrist strap and ESD dissipating mat are recommended whenever you work inside your KX2.
Optionally, touch a bare metal ground frequently while working.
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