Product Description
RG178 is a miniature, high-frequency 50-ohm coaxial cable designed for applications where space is extremely limited and flexibility is paramount. It features a FEP (Fluorinated Ethylene Propylene) outer jacket, which provides superior thermal resistance and chemical stability compared to standard PVC.
This cable is primarily used inside electronic equipment, such as GPS receivers, wireless modems, and military radios, to connect internal circuit boards and components where standard-sized cables cannot fit.
Key Specifications
| Parameter |
Details |
| Impedance |
50 Ohms |
| Nominal Velocity of Propagation (VP) |
66% |
| Capacitance |
29.5 pF/ft (96.8 pF/m) |
| Center Conductor |
26 AWG Solid Silver or Tinned Copper |
| Dielectric |
Solid PTFE (Polytetrafluoroethylene) |
| Shielding |
95% Tinned Copper Braid (High density for its size) |
| Outer Jacket |
FEP (Fluorinated Ethylene Propylene) |
| Max Operating Voltage |
1,500 V RMS |
| Operating Temperature |
-200°C to +200°C (Wide temperature range due to FEP) |
| Attenuation (Loss) |
~1.2 dB per 10 meters at 400 MHz (Higher loss due to small size) |
| Weight |
Approx. 0.9 kg per 100 meters |
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Physical Characteristics
- Nominal OD (Outer Diameter): 1.95 mm (0.077 inches) — Extremely small.
- Bending Radius: 10 mm (0.4 inches) static; 20 mm (0.8 inches) dynamic.
- Flexibility: Exceptionally flexible due to its tiny profile, allowing routing through the tightest gaps inside devices.
Common Connector Types
Due to its small diameter, RG178 requires specialized connectors or adapters:
- SMA (SubMiniature version A): Most common for wireless modules and GPS antennas.
- MCX / MMCX: Very small push-on connectors often used in cellular modems and GPS receivers.
- U.FL (IPEX): Ultra-miniature surface-mount connectors found on Wi-Fi and Bluetooth PCBs.
- SSMB: A microminiature connector used in some military and aerospace applications.
Key Features
- Ultra-Small Profile: One of the smallest standard 50-ohm cables available, making it ideal for internal wiring in compact devices.
- High-Temperature Resistance: The FEP jacket allows the cable to withstand extreme heat (up to 200°C) without melting or degrading, unlike PVC.
- Chemical Resistance: FEP is highly resistant to solvents, oils, and most chemicals, making it suitable for harsh industrial or aerospace environments.
- High-Frequency Performance: Utilizes PTFE dielectric, which has low loss at high frequencies (up to 18 GHz), making it suitable for GPS and microwave signals.
Applications
- GPS Antennas: Commonly used as the pigtail cable connecting the GPS patch antenna to the receiver module inside a device.
- Internal RF Interconnects: Used inside laptops, routers, and handheld radios to connect the main board to antennas.
- Test & Measurement: Used as "probes" or short jumpers inside high-frequency test equipment.
- Aerospace & Defense: Utilized in avionics and military radios where weight, size, and temperature resistance are critical.
Important Note
High Loss Warning: Because RG178 is very thin, it has high signal attenuation. It should only be used for very short cable runs (typically 1 meter or less). It is not suitable for long-distance transmission between buildings or antennas.
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