Quick Answer / Summary: RG174 (RG-174/U) is an ultra-flexible, miniature 50-ohm radio frequency coaxial cable featuring a 26 AWG (7×34 AWG) stranded center conductor and an outer diameter of approximately 2.8mm (0.11 inches). Widely used for short-run RF antenna pigtails, GPS automotive tracking modules, Wi-Fi router internal links, and oscilloscope test leads, it provides superior bendability in tight enclosures.
In automotive telematics, portable radio communications, and high-density electronic instrumentation, routing rigid, thick coaxial lines inside cramped dashboards or compact chassis enclosures is mechanically impossible. Specifying precision rg174 coaxial cable—engineered with an ultra-compact 2.79mm (0.110 inch) outer diameter, 26 AWG stranded copper-clad steel conductor, and solid polyethylene dielectric—ensures extreme flexural endurance, true 50-ohm characteristic impedance, and dependable RF signal routing up to 3 GHz.
Physical Architecture: 26 AWG Stranded Conductor and Miniature Dielectric
Analyzing the micro-coaxial construction of RG174: 1. 26 AWG Stranded Conductor (7×34 AWG Stranding): Unlike solid center pins that fatigue and snap under continuous vibration, RG174 incorporates 7 strands of 34 AWG copper-clad steel (CCS) or bare copper. This multi-strand geometry delivers high mechanical tensile strength and flexibility, surviving repeated 180-degree flexing around tight 0.5-inch bend radiuses; 2. Solid Polyethylene (PE) Dielectric: The 1.52mm (0.060″) solid polyethylene insulating core maintains precise concentric spacing between the center conductor and the outer shield, establishing a uniform 50-ohm (± 2 Ω) characteristic impedance and 66% velocity of propagation (VoP); 3. 88% to 90% Tinned Copper Braid Shield: A dense woven tinned copper braid provides RF shielding (>60 dB isolation) while resisting chemical corrosion in high-humidity automotive and marine engine compartments.
High-Frequency Attenuation Profile and Distance Limits
Due to its miniature 26 AWG conductor, RG174 exhibits higher attenuation than thicker cables (approx. 28 dB per 100 ft at 1 GHz, and 50 dB per 100 ft at 2.4 GHz); hence, it is strictly specified for short-distance jumpers (< 2 meters / 6 feet) where flexibility is paramount.
Automotive FAKRA and SMB Interconnects
RG174 is the global automotive standard for wiring GPS antennas, satellite radio (SDARS), and cellular telematics modules using color-coded, mechanically keyed FAKRA SMB connectors.
RG174 vs. High-Temperature RG316
While standard RG174 utilizes a PVC jacket rated from -20°C to +80°C, extreme aerospace environments require RG316, which utilizes identical physical dimensions but upgrades to silver-plated conductors and a fluoropolymer (FEP) jacket rated to +200°C.
RG174 Attenuation Curve and Technical Parameter Benchmark
| Frequency (MHz) | Application Domain | RG174 Loss (dB / 100 ft) | RG174 Loss (dB / 10 m) |
|---|---|---|---|
| 100 MHz | FM Radio & Low-Band VHF | 8.4 dB / 100 ft | 2.75 dB / 10 m |
| 400 MHz | UHF Two-Way Radio / Land Mobile | 17.5 dB / 100 ft | 5.74 dB / 10 m |
| 900 MHz | GSM / ISM / LoRa Wireless | 27.2 dB / 100 ft | 8.92 dB / 10 m |
| 1,575 MHz | GPS L1 Navigation Satellite | 36.8 dB / 100 ft | 12.07 dB / 10 m |
| 2,400 MHz (2.4 GHz) | Wi-Fi / Bluetooth / Zigbee | 49.5 dB / 100 ft | 16.24 dB / 10 m |
| 3,000 MHz (3.0 GHz) | 5G Sub-6 / Microwave Test | 56.0 dB / 100 ft | 18.37 dB / 10 m |
Real-World Application Scenarios
Automotive GPS navigation and telematics antenna cabling, internal Wi-Fi router antenna pigtails (SMA to U.FL), portable oscilloscope probe leads, and amateur handheld radio antenna adapters.
Recommended Internal Resources
Editorial Note: Suggested internal links (verify against sitemap before publishing): Link to commercial RF coaxial cabling at https://zh-zong.com/productlist/ (Anchor: 'explore factory-certified RG174 spools, miniature 50-ohm RF pigtails, and FAKRA jumpers'), link to video and audio adapter guidelines at https://zh-zong.com/video-usb-adapter-converter-guide/ (Anchor: 'analog audio and adapter converter guide'), and link to technical support at https://zh-zong.com/contact/ (Anchor: 'contact sales engineering team').
Frequently Asked Questions (FAQ)
Q: Can I run an RG174 cable for a 50-foot Wi-Fi antenna extension?
A: No; at 2.4 GHz, RG174 loses nearly 25 dB of signal power over 50 feet (reducing signal by over 99%), leaving virtually no usable Wi-Fi; for long antenna runs, use heavy low-loss LMR-400 or RG8 cable, reserving RG174 for 1-to-3 foot flexible jumpers.
Q: Why is RG174 preferred for automotive GPS antennas?
A: RG174 is thin and ultra-flexible (2.8mm diameter), allowing technicians to route it effortlessly through vehicle door pillars, headliners, and dashboard crevices into compact FAKRA radio jacks without kink damage.