1. Introduction
The Harvest BC200 is an omnidirectional UHF base antenna specifically designed for GMRS (General Mobile Radio Service) applications. It operates within the 460-470 MHz frequency range, providing 6.5 dBi gain and capable of handling up to 200W of power. This manual provides essential information for the safe and proper installation, operation, and maintenance of your BC200 antenna.
2. Safety Information
WARNING:
- Installation of this antenna near power lines is dangerous. For your safety, follow all installation instructions carefully.
- Ensure the antenna is mounted securely to withstand wind and environmental conditions.
- Do not operate the antenna during lightning storms. Disconnect the antenna from your radio equipment during such conditions.
- Always wear appropriate safety gear, including gloves and eye protection, during installation.
3. Package Contents
The Harvest BC200 antenna package typically includes the following components:
- One (1) main antenna mast section (white fiberglass).
- One (1) antenna base with UHF (SO-239) connector.
- Mounting hardware: U-bolts, clamps, nuts, and washers for mast attachment.
- Radial elements (if applicable, as shown in some configurations).
Figure 3.1: Harvest BC200 GMRS UHF Base Antenna components including mast, base, and mounting hardware.
4. Specifications
| Feature | Specification |
|---|---|
| Antenna Type | Omnidirectional 3×5/8λ, FRP outer shell |
| Frequency Range | 450 - 470 MHz (Tunable) |
| Gain | 6.5 dBi |
| Maximum Power Rating | 200W |
| Impedance | 50 ohms |
| VSWR | Less than 1.5:1 |
| Rated Wind Velocity | 60 m/sec |
| Accepted Mast Diameter | 30-62 mm |
| Connector Type | UHF (SO-239) |
| Antenna Length | 1.7 meters (approx. 67 inches) |
| Antenna Weight | 0.9 kg (approx. 1.98 lbs) |
| Product Dimensions (L x W x H) | 79"L x 5"W x 5"H (Shipping/Packaged) |
Figure 4.1: Overall dimensions of the Harvest BC200 antenna.
5. Setup and Installation
5.1 Site Selection
Choose a mounting location that provides a clear line of sight in all directions, free from obstructions such as buildings, trees, or other antennas. The higher the antenna, the better its performance. Ensure the location is safely away from power lines and other electrical hazards.
5.2 Antenna Assembly
- Carefully unpack all components and verify against the package contents list.
- Attach any radial elements to the antenna base if they are separate components. Ensure they are securely fastened.
- Connect the main antenna mast section to the antenna base. Ensure a firm connection.
5.3 Mounting the Antenna
The BC200 antenna is designed for mast mounting. The accepted mast diameter is 30-62 mm.
- Use the provided U-bolts, clamps, nuts, and washers to secure the antenna base to a sturdy mast.
- Tighten all hardware firmly to prevent movement, especially in high winds.
- Ensure the antenna is mounted vertically for optimal omnidirectional performance.
Figure 5.1: Harvest BC200 antenna assembled and mounted, showing mounting hardware.
5.4 Coaxial Cable Connection
The BC200 antenna features a UHF (SO-239) connector.
- Use a high-quality 50-ohm coaxial cable terminated with a UHF (PL-259) connector.
- Connect the coaxial cable securely to the antenna's SO-239 connector. Ensure the connection is tight to prevent moisture ingress and signal loss.
- Route the coaxial cable away from sharp edges and potential pinch points. Use drip loops to prevent water from running down the cable into the connector or your radio equipment.
Figure 5.2: Close-up of the antenna's UHF (SO-239) connector.
5.5 Grounding
For lightning protection and optimal performance, proper grounding of the antenna mast and coaxial cable is highly recommended. Consult local electrical codes and best practices for antenna grounding.
6. Operating Instructions
6.1 Initial SWR Check
Although the Harvest BC200 antenna is pre-tuned for the 450-470 MHz GMRS band, it is crucial to perform an SWR (Standing Wave Ratio) check after installation. An SWR of less than 1.5:1 is ideal for efficient power transfer and to prevent damage to your radio.
- Connect an SWR meter between your radio and the antenna.
- Transmit at a low power setting and measure the SWR across the desired operating frequencies within the 450-470 MHz range.
- If the SWR is higher than 2.0:1, re-check all connections, cable integrity, and antenna assembly.
6.2 Tuning (Optional)
The BC200 is tunable. If fine-tuning is required to achieve a lower SWR at a specific frequency within its range, refer to advanced antenna tuning guides or consult with an experienced radio technician. Improper tuning can degrade performance or damage equipment.
6.3 Connecting to Your Radio
Once the antenna is installed and SWR checked, connect the coaxial cable from the antenna directly to the antenna port on your GMRS radio. Ensure your radio is set to operate within the 460-470 MHz frequency range.
7. Maintenance
Regular maintenance will ensure the longevity and optimal performance of your Harvest BC200 antenna.
- Periodic Inspection: Annually inspect the antenna, mast, and mounting hardware for any signs of physical damage, corrosion, or loose connections.
- Cleaning: Keep the antenna free from dirt, ice, and debris. A gentle wipe with a damp cloth is usually sufficient. Avoid abrasive cleaners.
- Connector Check: Ensure the coaxial cable connector remains tight and free from moisture. Apply dielectric grease to the connector threads to prevent corrosion.
- Cable Integrity: Check the coaxial cable for cracks, fraying, or damage, especially where it enters connectors or passes through entry points.
8. Troubleshooting
8.1 High SWR Readings
- Loose Connections: Check all coaxial cable connections at the antenna and radio.
- Damaged Cable: Inspect the coaxial cable for kinks, cuts, or water ingress. Replace if damaged.
- Antenna Assembly: Verify that all antenna components are correctly assembled and securely fastened.
- Proximity to Metal: Ensure the antenna is not too close to large metal objects (e.g., metal roofs, other antennas) that could detune it.
8.2 Poor Transmission/Reception
- Antenna Height/Location: Ensure the antenna is mounted as high as possible with a clear line of sight.
- Radio Settings: Verify your radio is operating on the correct frequency and power settings.
- Coaxial Cable Quality: Long runs of low-quality or thin coaxial cable can lead to significant signal loss. Consider upgrading to a lower-loss cable.
- Interference: Check for local sources of electrical interference.
9. Warranty and Support
For technical support, troubleshooting assistance, or warranty inquiries regarding your Harvest BC200 antenna, please contact Harvest Wireless customer service. Refer to your purchase documentation or the Harvest Wireless website for specific warranty terms and contact information.