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Kenpro Kr - 450 Xl Manual

How to Use the Kenpro KR-450XL Aerial Rotator

The Kenpro KR-450XL is a horizontal rotator that can rotate a directional antenna up to 360 degrees. It is designed for amateur radio enthusiasts who want to communicate with distant stations using different frequencies and polarizations. In this article, we will explain how to use the Kenpro KR-450XL aerial rotator, and provide some tips and tricks for getting the best performance from your rotator.

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What You Need

To use the Kenpro KR-450XL aerial rotator, you will need the following items:

  • A directional antenna, such as a Yagi or a quad, that can be mounted on a mast or a tower.

  • A rotator controller unit, which is the device that controls the rotation of the antenna.

  • A rotator cable, which connects the rotator controller unit to the rotator motor unit.

  • A power supply, which provides 12V DC to the rotator controller unit.

  • A compass, which helps you align the antenna to the desired direction.

How to Install the Kenpro KR-450XL Aerial Rotator

Before you install the Kenpro KR-450XL aerial rotator, you should read the instruction manual carefully and follow the safety precautions. Here are the basic steps for installing the rotator:

  • Mount the rotator motor unit on the mast or the tower, and secure it with bolts and nuts. Make sure that the motor unit is level and aligned with the north direction.

  • Attach the antenna to the rotator motor unit, and adjust it to the desired elevation angle. Tighten the clamps and bolts to fix the antenna in place.

  • Connect one end of the rotator cable to the rotator motor unit, and run the other end to the rotator controller unit. Use cable ties or clips to secure the cable along the way.

  • Connect the power supply to the rotator controller unit, and plug it into a wall outlet. Turn on the power switch and check if the indicator lights are on.

  • Calibrate the rotator controller unit by following the instructions in the manual. This will set the zero point and the end points of the rotation range.

How to Operate the Kenpro KR-450XL Aerial Rotator

Once you have installed and calibrated the Kenpro KR-450XL aerial rotator, you can start using it to rotate your antenna. Here are some basic operations:

  • To rotate your antenna clockwise, press and hold the CW button on the rotator controller unit. To rotate your antenna counterclockwise, press and hold the CCW button. Release the button when you reach your desired direction.

  • To stop your antenna from rotating, press and release either button. The brake will automatically engage and lock your antenna in place.

  • To check your current direction, look at the digital display on the rotator controller unit. It will show you your azimuth angle in degrees from 0 to 360.

  • To preset a direction, press and hold either button until you hear a beep. Then enter your desired angle using the numeric keypad on the rotator controller unit. Press ENTER to confirm your preset.

  • To recall a preset direction, press RECALL and then enter your preset number using the numeric keypad. Press ENTER to confirm your recall. The antenna will automatically rotate to your preset direction.

Tips and Tricks for Getting the Best Performance from Your Rotator

The Kenpro KR-450XL aerial rotator is a reliable and durable device that can handle most weather conditions and loads. However, there are some tips and tricks that can help you get the best performance from your rotator:

  • Maintain your rotator regularly by lubricating it with grease or oil according to the manual. This will prevent rust and corrosion, and extend its lifespan.

  • Protect your rotator from lightning strikes by installing a lightning arrester or a surge protector on your rotator cable. This will prevent damage to your rotator and your radio equipment.

  • Avoid rotating your antenna too fast or too frequently, as this will cause wear and tear on your rotator and reduce its accuracy. Rotate your antenna only when necessary, and use the slowest speed possible.

  • Use a compass or a map to align your antenna to the correct direction. Do not rely on the digital display alone, as it may have some errors due to magnetic interference or calibration errors.

  • Test your rotator before using it for important communications, such as contests or emergencies. Make sure that it works properly and that your antenna is pointing to the right direction.


The Kenpro KR-450XL aerial rotator is a great device that can help you improve your amateur radio communications. By following the instructions in this article, you can install, operate, and maintain your rotator easily and safely. If you have any questions or problems with your rotator, you can contact the manufacturer or the dealer for support. Happy rotating!

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