AirheadStorm AT-14 4-Way Coaxial Remote Antenna Switch Kit User Manual

1. Introduction

The AirheadStorm AT-14 is a 4-way coaxial remote antenna switch designed to simplify antenna management for amateur radio and broadcasting setups. It allows for remote switching between up to four antennas using a +12V control voltage, making it ideal for antennas mounted in elevated or remote locations such as rooftops or towers. This device supports high-power transmission environments with a continuous power handling capability of up to 500W PEP and operates across a frequency range of 1.8MHz to 60MHz. Its low-loss design ensures efficient signal transmission and clear communications.

Figure 1: AirheadStorm AT-14 4-Way Coaxial Remote Antenna Switch and Controller Kit.

2. Safety Information

• Always disconnect power before making any connections or disconnections to prevent electrical shock or damage to equipment.
• Ensure all coaxial cable connections are secure and properly shielded to prevent signal leakage and interference.
• Do not exceed the specified power rating of 500W PEP to avoid damaging the switch or connected equipment.
• Install the antenna switch in a location protected from extreme weather conditions, moisture, and direct sunlight.
• Use appropriate grounding techniques for your antenna system to protect against lightning strikes and static discharge.

3. Package Contents

Verify that all components are present in the package:

• 1 x AT-14 4-Way Coaxial Remote Antenna Switch Unit
• 1 x Controller Kit (includes control board with rotary switch)

4. Setup and Installation

Follow these steps for proper installation of your AT-14 antenna switch:

1. Mounting the Switch Unit: Select a suitable location for the AT-14 switch unit, preferably near your antennas. This could be on a mast, tower, or other elevated structure. Ensure the mounting surface is stable and secure. The unit is designed for outdoor use but should be protected from direct heavy precipitation if possible.
2. Connecting Antennas: Connect your four antennas to the SO-239 input connectors labeled 1, 2, 3, and 4 on the switch unit. Use high-quality 50 Ohm coaxial cables with PL-259 connectors.
3. Connecting to Radio: Connect your radio transceiver to the SO-239 output connector labeled TX on the switch unit. Again, use a high-quality 50 Ohm coaxial cable with PL-259 connectors.
4. Connecting the Control Cable: Connect the control cable from the switch unit's CONTROL CABLE port to the corresponding terminals on the controller kit. Ensure correct polarity if specified (refer to controller kit documentation for specific wiring). The control cable transmits the +12V switching signal.
5. Powering the Controller: Connect a stable +12V DC power supply to the controller kit. Ensure the power supply can provide sufficient current for the controller's operation.

Figure 2: Detailed view of the AT-14 switch unit and the controller kit, showing connection points.

Figure 3: Close-up of the controller board, showing the +12V power input and control cable terminals.

5. Operating Instructions

Once the AT-14 switch and controller are properly installed and powered, operating the unit is straightforward:

1. Power On: Ensure the +12V power supply to the controller is active.
2. Antenna Selection: Use the rotary switch on the controller to select the desired antenna. The controller sends a +12V signal to the corresponding input on the switch unit, activating that antenna.
3. Verification: Some controllers may have LED indicators to show which antenna is currently active. Confirm the correct antenna is selected before transmitting.
4. Transmission: You can now transmit or receive using the selected antenna. The switch ensures only one antenna is connected to your radio at a time.

Figure 4: The compact design of the AT-14 switch unit for easy integration into existing setups.

6. Maintenance

The AT-14 antenna switch is designed for reliable operation with minimal maintenance. However, periodic checks can ensure optimal performance:

• Inspect Connections: Periodically check all coaxial and control cable connections for tightness and corrosion. Loose connections can lead to signal loss or intermittent operation.
• Clean Connectors: If necessary, clean the SO-239 connectors on the switch unit and your coaxial cables to remove dirt or oxidation. Use a non-abrasive cleaner suitable for electronic components.
• Environmental Check: Ensure the switch unit remains protected from excessive moisture or extreme temperatures. While robust, prolonged exposure to harsh conditions can affect longevity.
• Cable Integrity: Inspect all cables for signs of wear, damage, or kinks. Replace damaged cables promptly.

7. Troubleshooting

If you encounter issues with your AT-14 antenna switch, consider the following troubleshooting steps:

• No Antenna Switching:
  • Verify the +12V power supply to the controller is active and providing the correct voltage.
  • Check the control cable connections between the controller and the switch unit for proper wiring and continuity.
  • Ensure the rotary switch on the controller is functioning correctly.
• High SWR or Signal Loss:
  • Inspect all coaxial cable connections for tightness and proper seating.
  • Check the coaxial cables themselves for damage or shorts.
  • Ensure the selected antenna is properly tuned for the operating frequency.
  • Verify that the switch unit's connectors are clean and free of corrosion.
• Intermittent Operation:
  • Check for loose connections on both the switch unit and the controller.
  • Ensure the +12V power supply is stable and not fluctuating.

8. Specifications

9. Warranty Information

This product is covered by a standard manufacturer's warranty against defects in materials and workmanship. Please refer to the product packaging or contact AirheadStorm customer support for specific warranty terms and conditions. Keep your proof of purchase for warranty claims.

10. Support

For technical assistance, troubleshooting, or any questions regarding the AirheadStorm AT-14 4-Way Coaxial Remote Antenna Switch Kit, please contact AirheadStorm customer support. Contact information can typically be found on the product packaging or the official AirheadStorm website.