50 Ohm Coax Cable Types: A Guide to Making the Right Choice – Professional B2B Guide for Automotive & RF Applications (2026)

LEADSIGN-AUTO

·November 15, 2024

·5 min read

Intro: One Wrong Coax Can Kill Your GPS, Camera, or Radio Signal

Choosing the correct 50Ω coaxial cable is critical – especially in automotive applications where long cable runs (5‑20 metres) and high frequencies (GPS at 1.5 GHz, 4K cameras at 6+ GHz, 5G at 6 GHz) demand low loss and stable impedance. The wrong cable can cause excessive attenuation, leading to flickering camera images, slow GPS lock, or poor radio reception. This guide explains the key components of 50Ω coax, compares popular types (RG‑58, RG‑213, LMR‑400, RG‑214), and provides selection criteria for automotive RF systems.

50 Ohm Coax Cable Types: A Guide to Making the Right Choice — Image Source: LEADSIGN

1. Anatomy of a 50Ω Coaxial Cable – Why Each Layer Matters

Component	Material / Construction	Impact on performance
Centre conductor	Solid or stranded copper (or copper‑clad steel)	Lower resistance = less loss; solid is better for long fixed runs, stranded for flexibility.
Dielectric (insulation)	Solid PE or low‑loss foam (e.g., cellular PE)	Foam dielectric reduces attenuation – critical for high frequencies (≥1 GHz).
Shielding	Single / double braid, foil, or combination	Double shielding (braid + foil) rejects EMI from alternators, wipers, EV inverters.
Outer jacket	PVC, PE, or UV‑resistant materials	Protects against moisture, chemicals, abrasion, and UV (for roof‑mounted antennas).

Key takeaway for automotive: Use double‑shielded, low‑loss foam dielectric cable for camera and GPS extensions – especially in electric vehicles where EMI is high.

2. Common 50Ω Coax Types – Comparison Table

Cable type	Centre conductor	Shielding	Outer jacket	Attenuation (dB/100m @ 1 GHz)	Flexibility	Typical automotive use
RG‑58	Stranded copper	Single braid (95%)	PVC	≈25‑30 dB	High	Short (<3m) interior GPS or radio extensions (low loss not critical)
RG‑213	Solid copper	Double braid	PVC	≈12‑15 dB	Low	Longer fixed runs (roof antenna to head unit in large vehicles)
LMR‑400 (ultra low‑loss)	Copper‑clad aluminium (solid)	Double (foil + braid)	UV‑resistant PE	≈6‑8 dB	Medium	Long runs (>10m) for 4K cameras, 5G antennas, base stations
RG‑214	Solid copper	Double braid (silver‑plated)	PVC	≈10‑12 dB	Low	High‑power RF, extreme EMI environments (military, heavy‑duty)

For most automotive aftermarket applications (GPS, 1080p camera, 4G antenna up to 5‑10 metres), RG‑58 or low‑loss flexible coax is sufficient. For 4K cameras or 5G telematics over 10 metres, use LMR‑400 or LEADSIGN low‑loss Mini FAKRA cables.

Types of 50 Ohm Coax Cables — Image Source: LEADSIGN

3. Key Selection Criteria – What to Check Before You Buy

Criterion	What to look for	Why it matters
Attenuation (signal loss)	Low dB/100m at your operating frequency (e.g., 1.5 GHz for GPS)	Prevents weak signals and image degradation.
Frequency range	Cable must support up to 6 GHz (standard FAKRA) or 20 GHz (Mini FAKRA)	4K cameras and 5G require higher bandwidth.
Shielding effectiveness	Double shielding (foil + braid) for high‑EMI environments (EVs, near alternators)	Avoids noise ingress that corrupts data.
Flexibility	Stranded centre conductor and flexible jacket for tight bends	Easier routing behind dashboards, along chassis.
Connector compatibility	Must mate with FAKRA, SMA, or other automotive connectors	Use pre‑terminated FAKRA cables (LEADSIGN) to avoid field‑crimp errors.

Pro tip: For permanent installations (under carpet, behind trim), avoid cable that is too stiff (RG‑213, RG‑214) – use RG‑58 or low‑loss flexible equivalents.

4. Common Applications – Which Coax for Which Job?

Application	Frequency	Typical run length	Recommended cable	Notes
GPS antenna	1.575 GHz	2‑5 m	RG‑58 or low‑loss FAKRA amber	Loss must be low – keep cable short.
1080p backup camera (AHD)	~1.5 GHz	3‑10 m	Low‑loss flexible coax (e.g., RG‑58/U) or FAKRA blue	Acceptable loss up to 6 dB total.
4K camera (truck/bus)	6‑12 GHz	10‑20 m	LMR‑400 or LEADSIGN Mini FAKRA low‑loss	Standard RG‑58 loss too high.
4G/5G telematics antenna	0.7‑6 GHz	3‑15 m	LMR‑400 or RG‑214 (double‑shielded)	High EMI environment requires good shielding.
AM/FM radio antenna	0.1‑108 MHz	Any	RG‑58 or RG‑174	Low frequency, any quality 50Ω works.

5. 2026 Trends – Why Coax Choice Is More Critical Than Ever

Trend	Implication
4K surround cameras on commercial vehicles	Require Mini FAKRA (20 GHz, low loss). Standard RG‑58 will cause image loss over long runs.
5G C‑V2X (cellular vehicle‑to‑everything)	5G antennas need low‑loss, double‑shielded coax – use LMR‑400 or LEADSIGN Mini FAKRA violet.
EV / hybrid (high EMI)	Double shielding mandatory to reject motor and inverter noise. RG‑58 single braid insufficient.
Pre‑terminated FAKRA cables	Shops increasingly use LEADSIGN pre‑terminated cables – no field crimping, guaranteed impedance.

6. Connector Compatibility – Matching Coax to Automotive Connectors

Connector family	Impedance	Typical cable	Use
FAKRA (standard & Mini)	50Ω	Any 50Ω coax (RG‑174, RG‑58, low‑loss)	GPS, camera, 5G antenna – colour‑coded
SMA	50Ω	RG‑58, RG‑174	Test ports, external antennas (non‑automotive)
BNC	50Ω (or 75Ω)	RG‑58, RG‑213	Lab equipment, older radios (not common in modern cars)

Best practice for automotive: Use pre‑terminated FAKRA cables (LEADSIGN) – they come with the correct connector already attached, colour‑coded for the application (amber=GPS, blue=camera, violet=5G). No field crimping, no impedance mismatch.

7. Why LEADSIGN – Pre‑Terminated Low‑Loss Coaxial Cables for Automotive

LEADSIGN specialises in FAKRA (standard & Mini) pre‑terminated cables for automotive GPS, camera, and telematics applications. We offer low‑loss, double‑shielded coax in custom lengths – eliminating the need to field‑crimp connectors.

What LEADSIGN provides:

✅ FAKRA (standard & Mini) – all 14 colours, 50Ω, up to 20 GHz, IP67 optional
✅ Pre‑terminated cables – any length 0.3m – 20m, no field crimping
✅ Low‑loss, double‑shielded coax – suitable for long runs and EV environments
✅ Bulk pricing – for shops, fleets, and distributors

For your business: When you install a backup camera or GPS antenna, use a LEADSIGN pre‑terminated FAKRA cable – correct length, correct impedance, ready to install. No signal loss, no callback.

Final Recommendations – 50Ω Coax Selection for Automotive

Scenario	Recommended cable	Source
GPS antenna (short, <3m)	RG‑58 or LEADSIGN FAKRA amber	LEADSIGN for pre‑terminated
1080p camera (5‑10m)	Low‑loss flexible coax (e.g., RG‑58/U)	LEADSIGN FAKRA blue
4K camera (10‑20m, truck/bus)	LMR‑400 or LEADSIGN Mini FAKRA blue low‑loss	LEADSIGN
5G telematics (any length)	Double‑shielded low‑loss (LMR‑400 or Mini FAKRA violet)	LEADSIGN
AM/FM radio	Any 50Ω coax (RG‑58)	Any

Remember: A 10‑metre cable with 0.5 dB/m loss will lose 5 dB – over half your signal power. For critical systems, invest in low‑loss coax and pre‑terminated assemblies.

Ready to simplify your coaxial cable inventory with pre‑terminated FAKRA solutions?

[Request a free LEADSIGN FAKRA sample kit] | [China Shenzhen Leadsign Automotive Electronics Co,.Ltd Contact Info]