1. Important Safety Information & Warnings
- This product is not suitable for children under 14 years old.
- This product is electronic; do not disassemble it without permission.
- Avoid humid, high temperature, and corrosive environments.
- Do not soak or wash the antenna.
- Keep the antenna out of the reach of children.
2. Product Overview
The GP4 is a short-wave 4-band (7/14/21/29 MHz) 1/4-wavelength Vertical GP Antenna designed for outdoor and rooftop use. It features quick installation and does not require coil replacement to switch frequencies, thanks to its exquisite notch technology.
3. Setup and Installation
- Unpacking Inspection: Check all components for completeness after unpacking.
- Ground Net Installation:
- The ground net should be laid in a fan-shaped flat configuration.
- Use more than 7 ground nets for optimal performance.
- Reference lengths for ground nets: 2.5 meters (6 wires) and 5 meters (1 wire). In principle, more ground nets yield better results.
- The recommended installation height for the antenna is 0.3-0.5 meters from the ground net.
- The antenna is equipped with a dedicated mounting plate for installation.
- Alternative Balcony Installation: The GP4 can also be installed horizontally on a balcony. In this configuration, a metal guardrail can be used as the ground net. This setup has shown good performance with a small standing wave.
4. Operating Instructions
- Power Connection: Before connecting the antenna, ensure that the circuit is powered off and that the positive and negative poles are correctly connected.
- Power Limits: Do not exceed the rated voltage/current during use to avoid burning out the antenna.
- Frequency Switching: The GP4 antenna does not require manual coil replacement to switch between its operating frequencies (7, 14, 21, 28/29 MHz).
- Electrostatic Sensitivity: Operate electrostatic sensitive devices in an anti-static environment.
5. Maintenance
- Regularly inspect the antenna for any physical damage or loose connections.
- Keep the antenna clean and free from debris.
- Avoid exposing the antenna to extreme weather conditions for prolonged periods if possible, despite its wind resistance rating.
6. Troubleshooting
- Cosmetic Damage (Scratches): If you notice scratches on the product, please contact the seller for assistance.
- Operational Issues: If the product cannot be used or is not functioning as expected, contact the seller for support.
- Abnormal Heat or Smoke: In case of abnormal heat or smoke, immediately cut off the power supply and inspect the antenna for any faults. Do not attempt to operate it until the issue is resolved.
7. Specifications
| Feature | Specification |
|---|---|
| Antenna Type | Short-wave 4-band 1/4-wavelength Vertical GP Antenna |
| Operating Frequencies | 7 MHz, 14 MHz, 21 MHz, 28/29 MHz |
| Center Frequencies & Bandwidths |
|
| Antenna Length | 5.65 meters |
| Antenna Weight | 2.3 kg |
| Power Handling (PEP) | 1000W |
| Wind Resistance | Level 12 |
| Standing Wave Ratio (SWR) | < 1.5 (typically < 1.2 with optimized ground net) |
| Recommended Installation Height | 0.3 - 0.5 meters (from ground net) |
| Origin | Mainland China |
| Condition | New |
For more detailed information, you may refer to the official user manual PDF: GP4 Antenna User Manual (PDF)
8. User Tips
- Ground Net Optimization: To achieve an SWR below 1.2, consider using multiple strands of network cable for your ground net. For example, 10 lines of 2.5 meters and 4 lines of 5 meters have been reported to be effective. Experiment with the form and length of your ground network to coordinate standing waves.
- Balcony Setup: If rooftop installation is not feasible, the GP4 performs well when installed horizontally on a balcony, utilizing a metal guardrail as the ground net.
- Ease of Use: Users have consistently praised the GP4 antenna for its simplicity, ease of setup, and overall user-friendliness.
9. Support
For any questions, technical support, or issues with your GP4 antenna, please contact the seller directly through the AliExpress platform.