1. Introduction
The Xiegu VG4 is a high-performance 4-band Ground Plane (GP) type vertical antenna designed for HF transceivers. Constructed from durable aluminum alloy with an anti-oxidation surface, it offers a lightweight, solid, and easy-to-install solution for amateur radio enthusiasts. This antenna is engineered for excellent outdoor weather resistance, capable of withstanding significant wind conditions after proper installation.
The VG4 covers the 40, 20, 15, and 10-meter bands, providing automatic band switching through a single coaxial cable feed. Its design incorporates an effective counterpoise, eliminating the need for external radial wires or ground pegs. The antenna's top-loading and parallel resonator design ensure efficient operation even with a reduced physical height.
Figure 1.1: Overview of the Xiegu VG4 4-Band Vertical Antenna.
2. Key Features
- 4-Band Operation: Covers 40, 20, 15, and 10 meters, allowing users to trim the antenna for optimal performance within desired band segments.
- Automatic Band Switching: Utilizes a single coaxial cable feed, with each band individually tuned for low VSWR. Band selection is automatic, requiring only a band switch on the radio.
- Integrated Counterpoise: Features an effective built-in counterpoise, eliminating the need for external ground pegs or radial wires.
- Durable and Lightweight Construction: Made from aluminum alloy with an anti-oxidation coating, ensuring longevity and ease of installation.
- Compact Design: Suitable for installations in areas with limited space, such as roofs, patios, small backyards, condos, and motorhomes.
- Efficient Top Loading: Employs parallel resonators and capacitive hats for end loading of lower HF band sections, optimizing vertical-element efficiency even with reduced height.
- High Wind Resistance: Rated for high wind environments, capable of resisting a Category One Hurricane after normal installation without guying. Note: Actual wind resistance depends on installation method and firmness.
3. Setup and Installation
The Xiegu VG4 antenna is designed for straightforward assembly and installation. Ensure all components are present before beginning. Refer to the component overview image below.
Figure 3.1: All components of the Xiegu VG4 antenna laid out.
3.1 Component Identification
Familiarize yourself with the main parts of the antenna:
- Vertical radiating elements
- Horizontal counterpoise elements (radials)
- Base mounting bracket with SO239 connector
- Resonator sections
- Mounting hardware (U-bolts, nuts, washers)
Figure 3.2: Close-up view of the antenna base and SO239 connector.
Figure 3.3: Diagram illustrating the different sections and connection points of the antenna.
3.2 Assembly Steps
- Carefully unpack all components and verify against the parts list (refer to Figure 3.1).
- Assemble the vertical elements according to the provided diagram, ensuring all sections are securely connected.
- Attach the horizontal counterpoise elements to the base section. These elements serve as the antenna's effective ground plane.
- Mount the assembled antenna to a sturdy mast or pole using the supplied U-bolts and mounting hardware. Ensure the mounting location provides clear line-of-sight and is free from obstructions.
- Connect your 50-ohm coaxial cable to the SO239 connector at the base of the antenna.
- For optimal performance, the user may need to trim the antenna elements to achieve the desired frequency within each band. This fine-tuning process is crucial for achieving the lowest possible VSWR.
3.3 Site Considerations
Choose an installation site that is:
- Structurally sound to support the antenna's weight and withstand wind loads.
- As high as practically possible to maximize signal propagation.
- Away from power lines, large metal objects, and other potential sources of interference.
- Consider lightning protection measures, such as a lightning arrestor and proper grounding, as the antenna is exposed to outdoor elements.
Figure 3.4: The Xiegu VG4 antenna installed outdoors against a sky background.
4. Operating Instructions
The Xiegu VG4 antenna simplifies multi-band operation with its automatic band switching capability.
4.1 Band Selection
The antenna is designed to automatically switch between the 40, 20, 15, and 10-meter bands. Simply change the operating band on your HF transceiver, and the antenna will automatically adjust. No manual tuning or switching at the antenna itself is required.
4.2 Fine-Tuning for VSWR
While the antenna provides low VSWR across each band, optimal performance (rock-bottom SWR) can be achieved by fine-tuning the antenna to your preferred frequency within the band. This typically involves minor adjustments to the length of the radiating elements as per the assembly instructions. Use an antenna analyzer or the SWR meter on your transceiver to monitor and optimize the VSWR.
5. Maintenance
The Xiegu VG4 antenna is built for durability and requires minimal maintenance due to its robust construction and anti-oxidation surface treatment.
- Periodic Inspection: Annually inspect all connections, mounting hardware, and antenna elements for signs of wear, corrosion, or loosening. Tighten any loose bolts or clamps.
- Cleaning: If necessary, gently clean the antenna elements with a soft cloth and mild detergent to remove dirt or grime. Avoid abrasive cleaners.
- Lightning Protection: Ensure your lightning protection system (e.g., lightning arrestor, proper grounding) is in good working order. Regular checks of ground connections are recommended.
- Environmental Considerations: While designed for high wind environments, extreme weather conditions may necessitate additional inspection after the event.
6. Troubleshooting
This section provides guidance for common issues you might encounter with your Xiegu VG4 antenna.
| Problem | Possible Cause | Solution |
|---|---|---|
| High VSWR on all bands |
|
|
| High VSWR on a specific band |
|
|
| Poor signal reception/transmission |
|
|
If problems persist, consult a qualified amateur radio technician or contact Xiegu customer support.
7. Specifications
The following are the technical specifications for the Xiegu VG4 4-Band Vertical Antenna:
| Attribute | Value |
|---|---|
| Model | VG4 |
| Antenna Type | 4-Band Ground Plane (GP) Vertical Antenna |
| Bands Covered | 40m, 20m, 15m, 10m |
| Connector Type | SO239 |
| Material | Aluminum Alloy with Anti-Oxidation Surface |
| Color | Silver |
| Dimensions (Assembled) | Approx. 307 inches (25.6 ft) height |
| Weight | 7.28 kg (approx. 16 lbs) |
| Wind Resistance | Rated to resist Category One Hurricane (with proper installation) |
| Counterpoise | Integrated, no external radials needed |
Figure 7.1: Approximate dimensions of the Xiegu VG4 antenna.
8. Warranty and Support
Specific warranty details for the Xiegu VG4 antenna are not provided in this manual. For information regarding warranty coverage, terms, and conditions, please refer to the documentation included with your purchase or contact Xiegu directly through their official website or authorized distributors.
For technical support, product inquiries, or assistance with troubleshooting beyond the scope of this manual, please reach out to Xiegu customer service. Contact information can typically be found on the manufacturer's website or on your purchase receipt.