RG58 cable is a type of 50-ohm coaxial cable commonly used for radio frequency (RF) communication, data transmission, and low-power signal applications. It's widely recognized in both amateur radio and legacy networking setups.
RG58 Coaxial Cable
If you’re working with antennas, CB radios, or early Ethernet systems, understanding when and why to use RG58 is key to ensuring signal integrity and reliable performance.
What Is RG58 Cable?
RG58 is a flexible 50-ohm coaxial cable designed for transmitting RF signals at moderate distances and frequencies. It's thinner and more flexible than many other coax cables, making it ideal for patch cords, test equipment, or setups where space is limited.
✅ RG58 Cable Specifications:
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Impedance: 50 ohms
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Outer diameter: ~4.95 mm (0.195 inches)
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Conductor: Solid or stranded copper (usually 20 or 18 AWG)
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Shielding: Single braid or braid + foil (varies by type)
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Frequency range: Up to ~1 GHz (best below 500 MHz)
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Typical attenuation: ~20 dB per 100 feet at 100 MHz
What Is RG58 Cable Used For?
📡 1. Two-Way Radio and CB Radio Systems
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Used to connect transceivers to antennas
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Ideal for short to medium runs in amateur radio (ham), VHF, UHF setups
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Popular with CB radios in vehicles
🔧 2. RF Test Equipment and Lab Use
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RG58 patch cords are common for oscilloscopes, signal generators, and RF testing tools
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BNC connectors often used with RG58 for quick connect/disconnect
💾 3. Legacy Ethernet Networks (10BASE2)
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Once used for thin Ethernet (coaxial) computer networks
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10BASE2 networks are obsolete but RG58 remains in use for specific setups
🛰️ 4. Low-Power Antenna Feeds
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For GPS antennas, low-power transmitters, or control antennas where cable length is short
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Also used in telemetry, remote sensors, and small wireless systems
RG58 vs RG6 vs RG174: What’s the Difference?
| Feature | RG58 (50Ω) | RG6 (75Ω) | RG174 (50Ω) |
|---|---|---|---|
| Impedance | 50 ohms | 75 ohms | 50 ohms |
| Diameter | ~5 mm | ~7 mm | ~2.5 mm |
| Flexibility | Flexible | Less flexible | Very flexible |
| Frequency support | Up to 1 GHz (short runs) | Up to 3 GHz | Limited (~500 MHz) |
| Typical uses | RF comms, radios, test gear | Cable TV, satellite, broadband | Short patch cables, GPS |
Use RG58 for RF and radio.
Use RG6 for TV and broadband.
Use RG174 for tight spaces or mobile antennas.
Tips for Using RG58 Cable
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Keep runs short—less than 50 feet is ideal for minimal signal loss
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Use quality BNC or PL-259 connectors
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Avoid tight bends; maintain a gentle bend radius
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If needed for outdoor use, ensure the jacket is UV-resistant or rated for direct burial
Conclusion
RG58 coaxial cable is a versatile 50-ohm cable ideal for radio communications, RF testing, and legacy networking. Its compact size, flexibility, and ease of termination make it a staple in labs, vehicles, and amateur radio stations around the world.
Need RG58 Cable or Accessories?
We offer pre-terminated RG58 cables, BNC connectors, and custom lengths for RF projects, antennas, and lab use. Contact us to get expert support on your exact cable needs.
