Lectrosonics ALP620 LPDA Antenna User Manual

Introduction

The Lectrosonics ALP620 is a lightweight, shark fin style Log Periodic Dipole Array (LPDA) antenna designed for professional wireless microphone systems. It offers a wide frequency range of 450-862 MHz and features a 50 Ohm BNC connector. Its unique design minimizes wind loading, making it suitable for various outdoor and indoor applications where reliable signal reception is crucial.

Figure 1: Lectrosonics ALP620 LPDA Antenna. This image shows the black, shark fin shaped antenna with a grid-like pattern, and a mounting bracket at the bottom. The Lectrosonics logo and frequency range "450-850 MHz" are visible on the left side.

Important Safety Information

Read all instructions before using the product.
Do not expose the antenna to extreme temperatures or direct sunlight for prolonged periods.
Ensure all connections are secure to prevent signal loss or damage.
Use only specified cables and accessories.
Keep the antenna away from strong electromagnetic fields.
Do not attempt to disassemble or modify the antenna. Refer all servicing to qualified personnel.

Package Contents

Verify that all items are present in the package:

Lectrosonics ALP620 LPDA Antenna
Mounting Bracket (pre-attached or separate)
User Manual (this document)

Setup and Installation

Follow these steps to properly set up your ALP620 antenna:

Choose a Location: Select a location that provides a clear line of sight to the wireless transmitters and is free from obstructions like large metal objects or walls that could block RF signals. Higher positions are generally better.
Mounting:
- The ALP620 comes with an integrated mounting bracket.
- Attach the antenna securely to a microphone stand, truss, or other suitable mounting hardware using the provided bracket. Ensure it is stable and will not fall.
- Orient the antenna towards the area where the wireless transmitters will be used. The wider end of the "shark fin" should generally face the coverage area.
Connect RF Cable: Connect a high-quality 50 Ohm coaxial cable (e.g., RG-8X, RG-213, or equivalent) with BNC connectors from the ALP620's BNC output to the antenna input of your wireless receiver or distribution amplifier.
Cable Management: Route the coaxial cable neatly and securely to prevent tripping hazards and to protect the cable from damage. Avoid sharp bends in the cable.
System Check: Once connected, power on your wireless receiver and perform an RF scan to confirm proper signal reception and identify any potential interference.

Operating Guidelines

The ALP620 is a passive antenna and does not require external power for operation. Its performance is optimized by proper placement and orientation.

Orientation: For optimal performance, point the antenna directly towards the area where the wireless transmitters will be operating. The LPDA design provides a directional pattern, enhancing reception from the front and rejecting signals from the sides and rear.
Frequency Range: The ALP620 is designed for use within the 450-862 MHz frequency range. Ensure your wireless system operates within this range for best results.
Line of Sight: Maintain a clear line of sight between the antenna and the transmitters whenever possible. Obstructions like people, walls, or furniture can significantly degrade signal quality.
Antenna Diversity: For systems utilizing antenna diversity, use two ALP620 antennas spaced appropriately (typically 1/2 to 1 wavelength apart) to minimize dropouts caused by multipath interference.

Care and Maintenance

To ensure the longevity and optimal performance of your ALP620 antenna, follow these maintenance guidelines:

Cleaning: Clean the antenna periodically with a soft, dry cloth. Do not use abrasive cleaners, solvents, or harsh chemicals.
Storage: When not in use, store the antenna in a clean, dry environment, away from extreme temperatures and direct sunlight.
Inspection: Regularly inspect the antenna for any physical damage, especially to the BNC connector and mounting bracket. Ensure all connections are tight.
Environmental Protection: While designed for durability, avoid prolonged exposure to heavy rain or snow if possible, especially when not in active use.

Troubleshooting

Problem	Possible Cause	Solution
Poor signal reception / Dropouts	Antenna not pointed correctly. Obstructions in line of sight. Long or poor quality coaxial cable. Interference from other RF sources. Antenna damage.	Re-orient antenna towards transmitters. Relocate antenna to a clear line of sight. Use shorter, higher-quality 50 Ohm coaxial cable. Perform an RF scan to identify and avoid interfering frequencies. Inspect antenna for damage; replace if necessary.
No signal detected	Loose or incorrect BNC connection. Damaged coaxial cable. Antenna connected to wrong input.	Check and secure all BNC connections. Test cable continuity; replace if damaged. Ensure antenna is connected to the receiver's antenna input.

Specifications

Feature	Detail
Model Number	ALP620
Frequency Range	450-862 MHz
Impedance	50 Ohms
Connector Type	BNC
Antenna Type	Log Periodic Dipole Array (LPDA)
Product Dimensions	10 x 7.3 x 2.3 inches
Item Weight	12.8 ounces
Manufacturer	Lectrosonics
Date First Available	August 19, 2012
UPC	840014190379

Warranty and Support

For warranty information and technical support, please refer to the official Lectrosonics website or contact their customer service department. Keep your purchase receipt as proof of purchase for warranty claims.

Lectrosonics Official Website: www.lectrosonics.com

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