In the world of RF systems and low-voltage electronics, coaxial cables are most commonly associated with high-frequency signal transmission. But a growing number of engineers and system integrators are asking:
“Can I use a coaxial cable to transmit DC power?”
Whether you’re building a surveillance system, powering a remote antenna amplifier, or simplifying cable runs in a control cabinet, this question comes up more often than you’d think. In this article, I’ll walk you through the technical feasibility, risks, practical examples, and our professional recommendations — including when coaxial cable is a smart choice and when it’s not.
Understanding the Structure of a Coaxial Cable
Before discussing power transmission, let’s briefly look at how coaxial cable is built.
| Component | Function |
|---|---|
| Center Conductor | Carries the signal (or DC in our case) |
| Dielectric | Insulates and maintains spacing |
| Shield (braid/foil) | Blocks EMI, can serve as ground path |
| Outer Jacket | Protects against physical damage |
Coax is optimized for impedance matching and RF shielding, not for high current. But under specific conditions, it can carry DC power.
Is It Technically Possible to Use Coax for DC?
Yes — you can transmit DC through a coaxial cable, but there are important limits.
How DC Flows in Coax
In most cases:
- +VDC (positive) goes through the center conductor
- Ground (GND) returns through the outer shield
Key Parameters to Consider
| Parameter | What It Affects |
|---|---|
| Conductor Gauge (AWG) | Determines max current capacity (ampacity) |
| DC Resistance (Ω/km) | Influences voltage drop over long runs |
| Dielectric Rating | Prevents internal breakdown or arcing |
| Shield Structure | Impacts reliability under load |
Example: RG58 (20 AWG) is typically safe for 0.5A–1.0A at 12V DC over 10 meters.
Real-World Examples: Where DC Over Coax Works
1. CCTV Systems – Power Over Coax (PoC)
- Analog cameras can receive video + DC power via RG59 or RG6
- Voltage: 12V DC, Current: up to 1.5A
- Some systems use baluns to combine video and power
2. Bias-T Circuits for RF Systems
- Used to inject DC into the same coax that carries RF (e.g., antenna preamps)
- Often used in GPS antennas, active TV antennas
3. Industrial Sensors
- Short-distance, low-current sensors can share coaxial cable with signal and power, especially in space-constrained cabinets
When Using Coax for DC is a Bad Idea
Despite some flexibility, there are critical risks if used improperly:
- Overheating if current exceeds cable’s rating
- Voltage Drop over long distances
- Short Circuit risk from worn shielding
- Not suitable for high-current (>2A) applications
Always verify power requirements vs. cable specs before deploying.
Can I Use My Existing Coax for Low-Power DC?
Let’s test some scenarios:
| Use Case | Coax Type | Safe for DC? | Comments |
|---|---|---|---|
| 12V 1A power to camera (15m) | RG59 | ✅ Yes | Standard PoC application |
| GPS active antenna (5V, 0.05A) | RG174 | ✅ Yes | Very low power, Bias-T recommended |
| 24V 3A LED strip (20m) | RG58 | ❌ No | Excessive voltage drop + overheating |
| Remote radio amplifier (24V, 1.2A) | RG213 | ⚠️ Limited | Use only if high-quality cable used |
Interactive Question:
Would you trust a coaxial cable to power your critical field equipment for 10+ hours per day?
If not — it’s time to consider better options.
Bafitop’s Recommended Solutions for DC + Signal Transmission
At Bafitop, we understand that integrators and OEMs often need a simple, rugged, and dual-purpose solution. That’s why we offer:
1. Hybrid Coax-Power Cables
- One jacket, two systems: Coaxial core + DC power pair
- Ideal for:
- Surveillance systems
- Cellular DAS installations
- AV equipment runs
- Customizable lengths and connector types
2. PoC-Ready RG213-XL and LMR200-Flex
- Enhanced shielding and thicker conductors
- Verified dielectric strength for 12–24V DC
- N-Type / SMA / BNC terminated options
Available with sample kits and OEM volume pricing
FAQ: DC Over Coaxial Cables
Q1. Can coax cables carry both power and signal at the same time?
Yes, through Bias-T or hybrid cable construction.
Q2. Is there a voltage limit for coaxial cables?
Yes. Most are rated up to 30V–60V DC, depending on dielectric.
Q3. Will DC damage the shielding over time?
Not inherently, but heat from overcurrent can degrade the braid.
Conclusion: Should You Use Coax for DC?
If you’re transmitting low-voltage, low-current DC in controlled, short-run applications, coaxial cable can work — especially with purpose-built designs.
But for high-power, mission-critical, or long-distance DC delivery, choose a dedicated power cable or a hybrid solution that’s engineered for the task.
Let’s Find the Right Cable for Your Application
Whether you need:
- PoC-ready coax cables
- Hybrid signal + DC line
- Custom-engineered coax assemblies
Bafitop offers tailored solutions for RF, video, and power integration.
📧 Email us: sales@bafitop.com
📞 Phone / WhatsApp: +86-15817341810
🌐 Website: www.bafitop.com
Let’s optimize your signal and power delivery — together.
