Elecraft KPA3 Manual - Manual (Page 20)

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Hold the top cover above the K3, route the speaker wire under the stiffener bar and plug it into P25 on the
KIO3 board at the left rear of the K3 as shown in Figure 20.
Figure 20. Connecting Speaker Cable.
Position the top cover on the K3. Note that the tab on the back center goes under the rear lip of the K3 rear
panel. Secure the top cover with the nine 4-40 3/16” (4.8 mm) black flat head screws you removed earlier.
Configuring and Calibrating the KPA3
Your KPA3 will not operate correctly until the following steps are completed!
Reconnect power and a dummy load capable of dissipating 50 watts to your K3.
Refer to your Owner’s manual, turn on your K3 and do the following:
Enable the KPA3 as described under Configuration, Option Module Enables.
Perform the PA Temperature Sensor Calibration as described under Calibration Procedures
immediately, while the K3’s internal temperature is as close to ambient room temperature as possible.
Perform the Transmitter Gain Calibration as follows. This is essential for your KPA3 to operate
properly.
If you do not have a computer, perform the manual High Power (50W) TX Gain Calibration procedure in the
Calibration Procedures, Transmitter Gain section of your Owner’s manual.
If you have a Windows, Linux or Macintosh computer with an RS232 interface and cable, and an internet
connection, perform the automated TX Gain calibration using the K3 Utility program as follows:
Ensure you have the Elecraft K3 Utility Ver. 1.1.12.28 or later on your computer. The utility is available
for downloading from the Elecraft web site:
www.elecraft.com
Connect your computer to your K3’s RS232 port and start the K3 Utility program.
Click on the K3 Utility “Configuration” tab, “Calibrate Transmitter Gain…” and follow the instructions
to perform the 5-Watt and 50-Watt Transmitter Gain Calibration procedures.
That completes the installation of the KPA3 power amplifier in your K3 transceiver.