1. Introduction
This manual provides essential instructions for the proper installation, operation, and maintenance of the Trimble GCP05 Base Antenna Radio Cable. This coaxial cable (Part Number 51980) is designed for connecting Trimble GPS base antennas to compatible radio systems, including SPS855, SNB900, and SNB850 models. Adhering to these guidelines will ensure optimal performance and longevity of the product.
2. Safety Information
- Handle with Care: Avoid sharp bends, kinks, or excessive pulling on the cable, as this can damage internal conductors and shielding.
- Environmental Conditions: Ensure the cable is not exposed to extreme temperatures, direct sunlight for prolonged periods, or corrosive substances unless specifically rated for such conditions.
- Secure Connections: Always ensure connectors are securely fastened to prevent signal loss or damage from environmental factors.
- Electrical Safety: While this is a passive cable, always disconnect power from connected devices before attaching or detaching the cable to prevent accidental short circuits or damage to equipment.
3. Package Contents
Verify that your package contains the following item:
- One (1) Trimble GCP05 Base Antenna Radio Cable (Part Number 51980)

Figure 1: The Trimble GCP05 Base Antenna Radio Cable, showing both male-to-male connectors. This coaxial cable is designed for robust signal transmission between GPS base antennas and radio systems.
4. Product Overview
The Trimble GCP05 cable is a high-quality coaxial cable designed for reliable data and signal transmission in GPS and radio communication systems. It features male-to-male connectors, ensuring compatibility with various Trimble base antennas and radio units. Its robust construction is intended for field use, providing a stable connection for critical applications.

Figure 2: A coiled view of the Trimble GCP05 Base Antenna Radio Cable, highlighting the durable outer jacket and one of its male connectors. The cable is designed for flexibility and resilience in various operational environments.
5. Setup and Installation
Follow these steps to properly connect the Trimble GCP05 Base Antenna Radio Cable:
- Identify Ports: Locate the antenna output port on your Trimble GPS base antenna and the radio input port on your compatible radio system (e.g., SPS855, SNB900, SNB850). Both ports should be designed for male coaxial connectors.
- Connect to Antenna: Carefully align one end of the GCP05 cable's male connector with the antenna output port. Gently push and then twist the connector clockwise until it is finger-tight. Avoid over-tightening.
- Connect to Radio: Align the other end of the GCP05 cable's male connector with the radio input port. Gently push and twist clockwise until it is finger-tight.
- Secure Cable: Route the cable in a manner that avoids tripping hazards, sharp edges, or areas where it might be pinched or damaged. Use cable ties or appropriate fasteners if necessary to secure the cable path.
- Verify Connection: After installation, visually inspect both connections to ensure they are secure and that the cable is not under undue strain.
6. Operating Guidelines
Once the cable is properly installed, ensure the following for optimal operation:
- Maintain Connection Integrity: Periodically check that both ends of the cable remain securely connected to the antenna and radio. Loose connections can lead to signal degradation or intermittent operation.
- Avoid Interference: Route the cable away from sources of electromagnetic interference (EMI) such as power lines, motors, or other high-frequency transmitting devices, if possible.
- Environmental Protection: If operating in harsh weather conditions, ensure that the cable and its connections are protected from moisture and extreme temperatures as much as possible.
7. Maintenance
Proper maintenance extends the life and performance of your cable:
- Cleaning: Use a soft, dry cloth to wipe down the cable and connectors. For stubborn dirt, a slightly damp cloth with mild soap can be used, ensuring connectors are completely dry before re-connecting. Do not use harsh chemicals or abrasive cleaners.
- Inspection: Regularly inspect the cable for any signs of wear, cuts, abrasions, or damage to the outer jacket. Check connectors for corrosion or bent pins. Replace the cable if significant damage is observed.
- Storage: When not in use, coil the cable loosely (avoiding tight bends) and store it in a clean, dry environment, away from direct sunlight and extreme temperatures.
8. Troubleshooting
If you experience issues with your Trimble GCP05 cable, consider the following:
- No Signal or Intermittent Signal:
- Ensure both ends of the cable are securely connected and finger-tight.
- Inspect the cable for visible damage (cuts, kinks, severe bends).
- Check the connectors for bent pins or corrosion.
- Test with a known working cable if available, to rule out issues with the antenna or radio unit.
- Poor Signal Quality:
- Verify that the cable is not routed near strong sources of electromagnetic interference.
- Ensure the cable length is appropriate for the application and does not exceed recommended limits for signal integrity.
9. Specifications
| Feature | Detail |
|---|---|
| Brand | TRIMBLE |
| Model Number | GCP05 |
| Part Number | 51980 |
| Cable Type | Coaxial |
| Color | Black |
| Connector Gender | Male-to-Male |
| Shape | Round |
| Compatibility | Trimble GPS SPS855, SNB900, SNB850 systems |
| Item Weight | 5.7 ounces (approx. 162 grams) |
| Package Dimensions | 10.08 x 7.72 x 1.14 inches (approx. 25.6 x 19.6 x 2.9 cm) |
10. Warranty Information
This product is covered by a standard manufacturer's warranty against defects in materials and workmanship. For specific warranty terms and conditions, please refer to the documentation provided with your original purchase or contact Trimble customer support. The warranty typically covers normal use and does not extend to damage caused by misuse, accident, unauthorized modification, or improper installation.
11. Customer Support
For technical assistance, troubleshooting, or inquiries regarding your Trimble GCP05 Base Antenna Radio Cable, please contact Trimble customer support through their official website or the contact information provided with your Trimble equipment. When contacting support, please have your product model number (GCP05) and part number (51980) available.