on November 10th 93

LMR400 vs RG8 Coaxial Cable Comparison Guide

This article explores the features, uses, and comparisons of LMR400 and RG8 coaxial cables, helping you understand which cable might be the best fit for your needs. You'll find clear information on each cable’s characteristics, applications, and performance differences to make choosing the right one easier.

Catalog

Introduction to LMR400 Coaxial Cable

Times Microwave's LMR®-400 coaxial cable brings together flexibility, low signal loss, and durable RF shielding, designed for reliable performance. Its narrow bend radius makes it easy to maneuver, especially in areas where space is tight. This cable minimizes signal loss more effectively than other cables of similar size, offering about 90 dB of RF shielding, which reduces interference in environments where electromagnetic signals might cause issues. Suitable for both indoor and outdoor applications, the LMR-400 cable fits into a variety of setups requiring a low-loss, flexible RF cable, including WLL, GPS, LMR, WLAN, WISP, WiMax, SCADA, and mobile antennas. It also serves as a replacement for the RG-8 cable, making it a versatile choice across multiple applications.

Note: LMR® is a registered trademark of Times Microwave Systems.

Overview of RG8 Coaxial Cable

Pasternack’s RG8 coaxial cable is designed to be flexible and reliable. This 50-ohm cable features a polyethylene (PE) dielectric and a PVC jacket with a thickness of 0.405 inches. It operates efficiently up to frequencies of 1 GHz, providing an attenuation of 8 dB at this level and a maximum power rating of 190 watts. With its durable build, the RG8 cable can handle various RF and microwave needs, making it a practical option for transmitting radio signals or other RF applications. Pasternack offers this cable as part of a broad range of RF, microwave, and millimeter-wave components, with options for same-day shipping. Custom cable assemblies can also be built and shipped quickly, allowing users to get tailored solutions with speed and ease.

Key Features Comparison: RG8 vs LMR400

Main Characteristics of LMR400

• Pricing

Priced per foot, LMR400 gives flexibility to purchase only what you need for your setup, minimizing waste and cost.

• Cable Type

LMR400 is designed as a low-loss, flexible coaxial cable, making it suitable for both indoor and outdoor applications.

• Impedance

With a 50-ohm impedance, LMR400 ensures stable signal flow, fitting the requirements of most RF applications.

• Center Conductor

The center conductor is made of Bare Copper Covered Aluminum (BCCAI), giving a balance between performance and durability.

• Jacket Material

Made of Polyethylene (PE), the jacket protects the cable from environmental elements, making it suitable for various conditions.

• Outer Diameter

The cable has an outer diameter of .405 inches, which makes it compatible with many standard connectors.

• Indoor/Outdoor Use

LMR400 is designed for both indoor and outdoor use, allowing it to handle different installation needs without performance loss.

• RG-8 Replacement

It serves as a drop-in replacement for RG-8 cables, offering better flexibility and lower signal loss in the same applications.

• Attenuation at Different Frequencies

At 900 MHz, attenuation is 3.9 dB per 100 feet, and at 2.4 GHz, it is 6.65 dB per 100 feet, ensuring low signal loss.

• Applications

Ideal for WLL, GPS, LMR, WLAN, WISP, WiMax, SCADA, and mobile antennas, LMR400 suits a wide range of wireless systems.

• Maximum Length

Available in continuous lengths up to 1000 feet, LMR400 can handle extended runs without needing additional connectors.

Main Characteristics of RG8

• Conductor Material

RG8 features a bare copper conductor, known for its ability to provide reliable signal transmission.

• Insulation

Solid low-density polyethylene is used for insulation, adding durability to the cable while maintaining flexibility.

• Shielding

The cable has a bare copper shield, which reduces external interference, keeping your signal stable.

• Jacket Material

The jacket is made of contaminating PVC, Type 1 per MIL-C-17, offering basic protection, but not ideal for harsh outdoor environments.

• Jacket Color

The black jacket provides a simple, neutral appearance suitable for most installations.

• Center Conductor Size

The 12 AWG stranded copper center conductor is durable and capable of handling higher power levels.

• Shielding Quality

With 95% bare copper braid shielding, it provides decent interference protection for audio and radio frequency applications.

• Impedance

RG8 is a 50-ohm cable, making it compatible with standard RF applications and most commercial radio equipment.

• Certification

UL Listed, this cable meets safety standards, giving confidence in installations that require regulatory compliance.

• Availability

Sold per foot, you can purchase RG8 in the exact length needed for your project.

• Maximum Length

RG8 is available in lengths up to 1000 feet, making it suitable for installations that require longer cable runs.

Applications: RG8 vs LMR400

Use Cases of LMR400

• Wireless Communication Systems

LMR400 is commonly used in wireless communication systems for transmitting data over long distances without signal degradation.

• RG8/9913 Replacement

Designed as a drop-in replacement for RG8/9913 air-dielectric cables, LMR400 offers similar form factor but with enhanced performance.

• Short Antenna Connections

This cable is ideal for connecting to short antennas, helping to maintain signal strength over short to medium runs.

• Feeder Runs

It’s often used as a feeder cable, which is the line that carries the signal to and from the antenna in communication systems.

• Low-Loss Routing

LMR400 is easy to route in confined spaces, making it an excellent choice for installations where flexible but low-loss cable is required.

Use Cases of RG8

• Radio Transmission

RG8 is suitable for carrying radio transmission signals, widely used in commercial and amateur radio setups.

• Audio Control Rooms

In audio control rooms, RG8 is often chosen for its shielding capabilities, helping to prevent unwanted interference in audio signals.

• Radio Stations

Used in radio stations, RG8 handles the high-frequency transmission required for broadcasting.

• External Antenna Connections

RG8 is commonly used for connecting external radio antennas, providing a reliable link between the radio and antenna systems.

Comparison of Attenuation vs Frequency: LMR400 and RG8

LMR400 Attenuation vs Frequency

RG8 Attenuation vs Frequency

Specifications for LMR400 vs RG8

Parameter	LMR-400	RG8
Flex Type	Flexible	Flexible
Impedance	50 Ohm	50 Ohm
Dielectric Type	PE (F)	PE
Velocity of Propagation	85%	66%
Jacket Diameter	0.405 in	0.405 in
Jacket Material	PE	PVC (NC)
No. of Shields	2	1
Attenuation at 1 GHz	4.25 dB	8 dB
Frequency, Max	6 GHz	1 GHz
Max Operating Temperature	85°C	80°C
Center Conductor Type	Solid	Stranded
Inner Conductor, Number of Strands	1	7
Coax Type	Coax	Coax

LMR400 and RG8 Comparison

When comparing LMR400 and RG8 cables, both have a 50-ohm impedance, but they differ significantly in performance attributes such as attenuation and frequency range. The LMR400 cable stands out with a lower attenuation rate—4.25 dB at 1 GHz compared to RG8’s 8 dB—which means it loses less signal strength over distance. Additionally, LMR400 can operate at frequencies up to 6 GHz, whereas RG8 is limited to 1 GHz. Temperature-wise, LMR400 can handle up to 85°C, while RG8 can operate up to 80°C. Designed to replace lower-quality RG-8 cables, LMR400 offers increased flexibility, simpler installation, and minimal signal loss, making it an optimal choice for setups where maintaining signal quality over distance is essential.

LMR400 Manufacturer Information

Times Microwave Systems is a well-established provider of coaxial transmission lines, serving various industries, including military, aerospace, wireless communications, and industrial applications. They offer a broad range of RF and microwave transmission solutions designed to meet both high-performance requirements and commercial volume needs. With production facilities in the United States and China, Times Microwave Systems can cater to applications ranging from a few kHz up to 110 GHz. Since 2009, Times Microwave has been a part of Amphenol Corporation, one of the largest interconnect component manufacturers worldwide. This connection has further enabled them to offer advanced solutions in electrical, electronic, and fiber-optic connectors, as well as specialized coaxial and other cabling solutions.