ELECRAFT KX2 Manual
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ELECRAFT KX2 Manual

Harmonic level reduction
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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
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
IMAGE
Shoulder Enhanced
in Image

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.
Elecraft KX2
Harmonic Level Reduction
Revision B, June 7, 2017
Copyright © 2017, Elecraft, Inc. All Rights Reserved
QUANTITY
Copper Tape
1.25" (3.18 cm)
Do not remove from backing until
instructed to do so.
Foam Tape
0.4" (10.2 mm)
Do not remove from backing until
instructed to do so.
Thermal Insulator
Both insulators may be supplied on
2
the same paper backing.
Do not remove from backing until
instructed to do so.
2
Shoulder Washer
Nut, 4-40, 0.062" (1.6 mm) Thick
2
2
#4 Lock Washer, Internal Tooth
Elecraft
•
www.elecraft.com
E740304
DESCRIPTION
•
831-763-4211
k3support@elecraft.com
ELECRAFT PART
NUMBER
E980339
E980338
E700002
E700001
E700055
E700010

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Summary of Contents for ELECRAFT KX2

  • Page 1: Tools Required

    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.
  • Page 2 Disconnect all cables and, if used, external power from your KX2. 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.
  • Page 3 Figure 4. Mounting the Thermal Insulators and Foam Tape. KX2 Harmonic Reduction Modification Instructions Page 3...
  • Page 4 Figure 6. This hardware replaces the nuts with captive washers you removed. They will not be used. A magnetized screwdriver can help hold the lock washer on the screw while starting the nut, especially if the KXAT2 ATU is installed. Figure 6. New Transistor Mounting Hardware. KX2 Harmonic Reduction Modification Instructions Page 4...
  • Page 5 RF board if KXAT2 or to the KXAT2. The completed installation is shown in Figure 7. Figure 7. Completed Modification. Replace the battery (if installed) and close the case (see Figure 1 on page 2). That completes the modification. KX2 Harmonic Reduction Modification Instructions Page 5...

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