1. Introduction
This manual provides instructions for the proper installation, operation, and maintenance of your Radioddity CBL-561 Dual Band HF Antenna. Please read this manual thoroughly before using the antenna to ensure optimal performance and safety.
Image 1.1: Radioddity CBL-561 Dual Band HF Antenna, showcasing its full assembly.
2. Key Features
- Wide Frequency Support: Operates across a 25-30MHz range, compatible with 10-meter and 11-meter bands.
- Exceptional SWR Performance: Achieves an SWR of ≤1.3:1 for minimal signal loss and efficient transmission.
- High Power Capacity: Designed to handle up to 1000W, suitable for demanding communication setups. Compatible with Radioddity mobile radios including QT80, QT60, QT40, CB-900 PRO, CS-47, and CB-500.
- Sturdy Construction: Made from high-quality aluminum alloy for durability and weather resistance.
- Adjustable Design: Features a three-section adjustable design for fine-tuning length across different frequencies. Includes an Allen key for adjustments.
3. Setup and Installation
Proper installation is critical for optimal antenna performance. Follow these steps carefully.
3.1 Component Overview
Image 3.1: Detailed views of the antenna's base, coil, and adjustable tip, showing the PL-259 connector and Allen key adjustment point.
The CBL-561 antenna consists of several sections: the base with a PL-259 connector, a loading coil, and an adjustable telescopic whip. An Allen key is provided for tuning.
3.2 Assembly
- Connect to Mount: Securely attach the antenna's PL-259 connector to a compatible antenna mount (e.g., magnetic mount, trunk lip mount). Ensure a good electrical connection.
- Connect to Radio: Connect the antenna mount's coaxial cable to your mobile radio's antenna input.
- Grounding: Ensure your antenna mount and radio system have a proper ground connection. A good ground plane is essential for optimal performance, especially for mobile installations.
Image 3.2: Close-up of the PL-259 connector at the base of the antenna, ready for connection to a mount.
Image 3.3: The CBL-561 antenna mounted on a vehicle with a magnetic base, connected to a Radioddity mobile radio.
4. Operation and SWR Tuning
The CBL-561 antenna is designed for adjustable performance across its frequency range. Proper SWR (Standing Wave Ratio) tuning is crucial for efficient operation and to prevent damage to your radio.
4.1 Understanding SWR
SWR measures how efficiently radio frequency power is transmitted from the radio, through the feed line, into the antenna. An SWR of 1:1 is ideal, meaning all power is transmitted. An SWR of ≤1.3:1 is considered excellent for this antenna. High SWR indicates reflected power, which can reduce transmission range and potentially damage your radio's final amplifier stage.
4.2 SWR Tuning Procedure
- Initial Setup: Connect an SWR meter between your radio and the antenna.
- Select Frequency: Choose the center frequency of the band you intend to operate on (e.g., 27.000 MHz for 11-meter band).
- Measure SWR: Transmit a low-power signal (e.g., 5W) and measure the SWR.
- Adjust Antenna Length:
- If the SWR is high and lower on higher frequencies, the antenna is too long. Shorten the adjustable whip using the provided Allen key.
- If the SWR is high and lower on lower frequencies, the antenna is too short. Lengthen the adjustable whip using the provided Allen key.
Image 4.1: SWR adjustment chart illustrating the relationship between antenna length (L/MM) and frequency (MHz) for optimal SWR.
- Repeat: Make small adjustments and re-measure SWR until the lowest possible SWR is achieved at your desired operating frequency. Aim for ≤1.3:1.
Note: The optimal length for the adjustable whip will vary depending on your specific installation, ground plane, and operating frequency. Always tune for the lowest SWR.
5. Maintenance
The Radioddity CBL-561 antenna is designed for durability. Regular maintenance will ensure its longevity and performance.
- Cleaning: Periodically clean the antenna with a soft, damp cloth to remove dirt and grime. Avoid abrasive cleaners.
- Connection Check: Regularly inspect all connections (PL-259, coaxial cable) for corrosion or looseness. Ensure they are clean and tight.
- Physical Inspection: Check the antenna for any signs of physical damage, such as bends, cracks, or frayed wires, especially after exposure to harsh weather conditions.
- Weather Protection: While weather-resistant, extreme weather conditions (e.g., heavy ice, strong winds) can still affect the antenna. Consider removing or securing the antenna during severe weather.
6. Troubleshooting
If you experience issues with your CBL-561 antenna, refer to the following common problems and solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| High SWR readings |
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| Poor transmission/reception range |
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| Antenna components feel loose |
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7. Specifications
| Feature | Detail |
|---|---|
| Model | CBL-561 |
| Frequency Range | 25-30 MHz |
| SWR | ≤1.3:1 |
| Max Power | 1000W |
| Connector Type | PL-259 |
| Material | Aluminum Alloy |
| Adjustable Sections | Three-section telescopic design |
| Item Weight | 1.35 pounds (approx. 0.61 kg) |
| Package Dimensions | 31.75 x 2.5 x 2.3 inches (approx. 80.6 x 6.35 x 5.84 cm) |
Image 7.1: Diagram showing the approximate dimensions of the antenna's main components: 74cm (29.1") for the top whip, 44.5cm (17.5") for the coil section, and 32cm (12.6") for the base section.
8. Customer Support and Warranty
For technical assistance, warranty information, or any questions regarding your Radioddity CBL-561 antenna, please contact Radioddity customer support.
You can typically find support contact details on the official Radioddity website or through your purchase platform.
Please retain your proof of purchase for warranty claims.
