Product Description
RG179 is a miniature, high-frequency 75-ohm coaxial cable specifically designed for high-definition video and RF signal transmission in confined spaces. It is essentially the 75-ohm counterpart to the popular RG178 (50-ohm) cable.
Featuring a FEP (Fluorinated Ethylene Propylene) outer jacket and a solid PTFE dielectric, it is engineered to deliver superior electrical performance and thermal stability compared to standard PVC-jacketed cables. It is the standard choice for internal wiring in high-end video equipment, cameras, and broadcast systems where space is limited and signal integrity is critical.
Key Specifications
| Parameter |
Details |
| Impedance |
75 Ohms (Standard for Video & High-Definition Signals) |
| Nominal Velocity of Propagation (VP) |
69% |
| Capacitance |
21.4 pF/ft (70.2 pF/m) |
| Center Conductor |
Solid Silver or Tinned Copper (30 AWG) |
| Dielectric |
Solid PTFE (Polytetrafluoroethylene) |
| Shielding |
95% Tinned Copper Braid (High density for low noise) |
| Outer Jacket |
FEP (Fluorinated Ethylene Propylene) |
| Max Operating Voltage |
1,000 V RMS |
| Operating Temperature |
-200°C to +200°C (Exceptional thermal range) |
| Attenuation (Loss) |
~2.2 dB per 10 meters at 200 MHz |
| Weight |
Approx. 0.5 kg per 100 meters |
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Physical Characteristics
- Nominal OD (Outer Diameter): 1.95 mm (0.077 inches) — Ultra-thin.
- Bending Radius: 10 mm (0.4 inches) static; 20 mm (0.8 inches) dynamic.
- Flexibility: High. Its tiny profile allows it to be routed through the smallest gaps inside cameras and electronic enclosures.
Common Connector Types
Due to its small size and 75-ohm impedance, RG179 is typically terminated with:
- SMA (75 Ohm Version): Used for high-frequency video and data links.
- MCX / MMCX: Common in compact video devices and modems.
- U.FL (IPEX): Surface-mount connectors found on mini-PCIe cards and HD video modules.
- BNC (Mini): Used in specialized test equipment.
Key Features
- 75-Ohm Impedance: Optimized for video bandwidth, ensuring compatibility with HD-SDI, HDMI internal wiring, and other video standards.
- Ultra-Low Loss Dielectric: The solid PTFE core ensures consistent impedance and low signal loss up to microwave frequencies (10 GHz+).
- High-Temperature FEP Jacket: Resists extreme heat, solvents, and chemicals, making it suitable for professional broadcast environments.
- High Shielding: The 95% braid provides excellent immunity to electromagnetic interference (EMI), crucial for clean video signals.
Applications
- HD Video Equipment: Used internally in professional video cameras, monitors, and recorders (e.g., connecting sensors to processing boards).
- Broadcast & SDI: Internal wiring for HD-SDI and 3G-SDI signal routing inside racks and gear.
- Medical Imaging: Used in endoscopes and ultrasound equipment where a small diameter and high image quality are required.
- GPS & Antennas: Used as a pigtail for 75-ohm GPS antennas or DAB/DVB-T tuners.
Important Note: RG179 vs. RG178
- RG178: 50 Ohms. Used for RF, Wi-Fi, and data communications.
- RG179: 75 Ohms. Used for Video, CATV, and high-frequency analog signals.
- Warning: These cables are physically identical in size and appearance, but electrically incompatible. Using a 50-ohm cable (RG178) in a 75-ohm video system will cause signal reflections and poor picture quality. Always verify the impedance before installation.
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