ELECRAFT KX3 Installation Instructions Manual
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Also See for KX3:
- Owner's manual (55 pages) ,
- Assembly manual (52 pages) ,
- Installation and operation manual (17 pages)
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Introduction
The enhanced heat sink improves the heat dissipation of the final amplifier transistors improving performance
without significantly increasing the rig's size or weight.
The enhanced heat sink is thicker than the original and wraps around the bottom of the KX3 as shown in
Figure 1. The additional mass and area of this heat sink provides as much as twice the operating time at full
power before the KX3's protective circuitry automatically reduces the power to 5 watts.
The enhanced heat sink replaces the existing heat sink. Do not attempt to use both heat sinks. Any possible
improvement in performance is negligible and may actually reduce the effectiveness of the enhanced heat sink.
This kit includes longer screws as needed to install the enhanced heat sink.
Elecraft
KX3HSMDKT Enhanced Heat Sink
Installation Instructions
Revision A, December 9, 2014
Copyright © 2014, Elecraft, Inc., All Rights Reserved
Figure 1. Enhanced Heat Sink Installed.
®
KX3
1
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Table of Contents
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Summary of Contents for ELECRAFT KX3
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Page 1: Installation Instructions
The enhanced heat sink is thicker than the original and wraps around the bottom of the KX3 as shown in Figure 1. The additional mass and area of this heat sink provides as much as twice the operating time at full power before the KX3’s protective circuitry automatically reduces the power to 5 watts. -
Page 2: Installing The Heat Sink
Disconnect all cables attached to the KX3 and remove the KXPD3 paddles if installed. Open the KX3 just as you would to install or remove batteries (see Internal Batteries in your Owner’s Manual for details about how to do this). - Page 3 Hold these nuts with your long nose pliers to avoid dropping them into the KX3. Keep the two nuts with captive lock washers. They will be replaced later. The screws will not be used. Longer screws are provided in the kit to replace them. Set the old heat sink aside. It will not be replaced.
- Page 4 If you haven’t done so already, remove the new heat sink from the paper wrapper. The side of the heat sink that will face the KX3 has been masked keep it free of the powder coating (see Figure 3). Remove the masking tape covering this area of the heat sink. The tape is strong. You can peel up one corner with a sharp tool and then pull the tape off of the metal as shown in the figure.
- Page 5 Locate the thermal pad and carefully separate the white protective coating from one side. There are three layers: a clear plastic protective film, the thermal pad itself, and a white plastic protective film. The three layers are shown in Figure 5. Remove only the white plastic protective film to expose the adhesive surface underneath.
- Page 6 Remove the clear plastic protective cover from the thermal pad (see Figure 7). Be sure the thermal pad remains attached to the metal and does not fold or wrinkle. Keep the exposed adhesive surface of the thermal pad clean. Figure 7. Removing the Clear Plastic Protective Cover from the Heat Sink.
- Page 7 Close the KX3 enclosure and stand it vertically as shown in Figure 8. You don’t need to tighten the thumb screws yet. Attach the cover with the black flat head screws as shown. Carefully place the heat sink on the enclosure and secure it with the screws shown.
- Page 8 KXFL3 board as shown in Figure 9. If it strikes the module pc board, reseat the module in the connector on the KX3 main board so the hole lines up with the screw. The purpose of this screw is only to ensure the module is not jarred loose by rough handling of the KX3.
- Page 9 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.
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