LMR-400 Coaxial Cable is a high-performance 50 Ohm low-loss RF cable designed for reliable signal transmission in wireless communication, telecom, antenna, GPS, WiFi, 4G LTE, 5G and other RF applications. With its robust construction, excellent shielding and low signal attenuation, LMR-400 is widely used for antenna feeder runs and RF jumper assemblies.
The standard LMR-400 has an overall diameter of approximately 10.29 mm (0.405 inch) and is designed for operation up to 8 GHz. It is also available with UV-resistant outdoor jackets, making it suitable for demanding outdoor RF installations.
What is LMR-400 Coaxial Cable?
LMR-400 is a 50 Ohm RF coaxial cable developed for high-performance signal transmission. It provides lower attenuation than many smaller-diameter flexible coaxial cables, making it particularly useful when cable runs are longer and minimizing RF signal loss is important.
The cable is designed for applications such as antenna feeder systems, wireless communication equipment, GPS systems and RF jumper connections. The standard version is suitable for both indoor and outdoor applications, depending on the jacket construction.
Key Features of LMR-400 Cable
- 50 Ohm impedance
- Low-loss RF coaxial cable
- Approx. 10.29 mm outer diameter
- Maximum specified frequency: 8 GHz
- Excellent RF shielding of more than 90 dB
- UV- and weather-resistant outdoor jacket available
- Flexible construction for easier installation
- Suitable for antenna feeder applications
- Suitable for RF jumper assemblies
- Operating temperature approximately -40°C to +85°C
- Minimum bend radius approximately 25.4 mm
- Suitable for a wide range of wireless and RF systems
LMR-400 Coaxial Cable Construction
LMR-400 uses a multi-layer coaxial construction designed to provide good RF performance and mechanical durability.
1. Center Conductor
The center conductor carries the RF signal through the cable. Depending on the exact LMR-400 variant, conductor construction can differ, so the specific product datasheet should be checked before specifying the cable.
2. Foam Polyethylene Dielectric
The dielectric separates the center conductor from the outer shielding and helps maintain the electrical characteristics required for RF transmission.
3. Aluminum Tape Shield
An aluminum tape layer provides a continuous shield around the dielectric and helps reduce electromagnetic interference.
4. Tinned Copper Braid
The braid provides additional shielding and mechanical protection. Together, the foil and braid provide shielding effectiveness greater than 90 dB for the standard LMR-400 specification.
5. Protective Outer Jacket
The outer jacket protects the cable against environmental exposure and mechanical stress. Standard LMR-400 uses a PE jacket designed for outdoor applications and UV resistance.
LMR-400 Cable Attenuation
One of the major advantages of LMR-400 is its relatively low attenuation for a flexible coaxial cable of its size.
Typical attenuation values from the manufacturer’s datasheet include:
| Frequency | Typical Attenuation |
|---|---|
| 450 MHz | 8.9 dB/100 m |
| 900 MHz | 12.8 dB/100 m |
| 1500 MHz | 16.8 dB/100 m |
| 1800 MHz | 18.6 dB/100 m |
| 2000 MHz | 19.6 dB/100 m |
| 2500 MHz | 22.2 dB/100 m |
| 5800 MHz | 35.5 dB/100 m |
| 8000 MHz | 42.7 dB/100 m |
Actual system loss depends on operating frequency, cable length, connectors, installation conditions and the specific cable variant.
Applications of LMR-400 Coaxial Cable
LMR-400 is suitable for many professional RF and wireless communication applications, including:
- 4G LTE antenna systems
- 5G antenna systems
- Cellular communication
- Mobile network installations
- WiFi and WLAN
- GPS antenna systems
- WISP networks
- Wireless communication equipment
- RF equipment interconnections
- Antenna feeder systems
- RF jumper assemblies
- Telecom infrastructure
- Outdoor wireless networks
- Radio communication systems
- SCADA and industrial communication
The manufacturer’s listed applications include antenna feeder runs, inter/intra-cabinet jumpers, internal equipment wiring and GPS system wiring.
LMR-400 for 4G and 5G Antenna Systems
For cellular installations, RF cable quality can have a significant effect on overall system performance. Cable loss increases with both cable length and frequency, so selecting an appropriate low-loss cable is important.
LMR-400 is commonly used for antenna feeder and jumper applications where a combination of low loss, flexibility and mechanical durability is required.
For 4G LTE and 5G installations, LMR-400 can be used between compatible RF equipment and antennas when its electrical specifications meet the requirements of the particular system.
LMR-400 for WiFi and Wireless Networks
LMR-400 can also be used in WiFi, WLAN, WISP and other wireless network installations. Its 50 Ohm impedance makes it compatible with many RF antenna systems and wireless communication devices.
It is especially useful where a longer RF connection is required and lower cable loss is preferred over smaller flexible coaxial cables.
Why Choose LMR-400 Coaxial Cable?
There are several reasons LMR-400 is widely used for professional RF installations:
Low Signal Loss
LMR-400 is designed to provide low attenuation compared with many smaller flexible coaxial cables, helping maintain RF signal strength over the cable run.
Strong Shielding
The standard construction provides greater than 90 dB shielding effectiveness, helping protect the RF signal from unwanted electromagnetic interference. Much better than lmr 300
Outdoor Durability
The standard outdoor version features a UV-resistant PE jacket, making it suitable for outdoor antenna and wireless installations.
Flexible Installation
Despite its larger diameter compared with smaller coaxial cables, LMR-400 remains flexible enough for many antenna feeder and jumper installations.
Wide Frequency Capability
The standard LMR-400 is specified up to 8 GHz, making it suitable for a broad range of RF and wireless applications.
LMR-400 Cable Connectors
LMR-400 can be manufactured into cable assemblies with different RF connectors depending on the equipment and antenna interface.
Common connector options include:
- N Male
- N Female
- SMA Male
- SMA Female
- TNC
- BNC
- 7/16 DIN
- Other customized RF connectors
The connector should be selected according to the equipment interface, frequency and required RF performance.
LMR-400 vs LMR-300
Both LMR-300 and LMR-400 are 50 Ohm RF coaxial cables, but LMR-400 has a larger diameter and generally provides lower attenuation.
| Feature | LMR-300 | LMR-400 |
|---|---|---|
| Impedance | 50 Ohm | 50 Ohm |
| Approx. Diameter | 7.62 mm | 10.29 mm |
| Typical Use | Shorter RF runs & jumpers | Antenna feeders & longer RF runs |
| Flexibility | Higher | High |
| Signal Loss | Higher than LMR-400 | Lower than LMR-300 |
| Outdoor Versions | Available | Available |
The best cable depends on the required frequency, cable length, available installation space and acceptable RF loss.
LMR-400 vs RG-8
LMR-400 is often considered when replacing or upgrading older RG-8/9913-type coaxial cable installations. The manufacturer describes LMR-400 as a drop-in replacement for RG-8/9913 cables in suitable applications.
However, cable replacement should always be checked for impedance, connector compatibility, installation requirements and system specifications before installation.
LMR-400 Cable for Antenna Feeder Applications
An antenna feeder cable carries RF energy between an antenna and radio, booster, access point or other RF equipment.
For longer cable runs, reducing cable attenuation becomes increasingly important. LMR-400 provides a practical combination of low RF loss, shielding, flexibility and outdoor durability, making it suitable for many antenna feeder applications.
How to Select the Right LMR-400 Cable
Before purchasing LMR-400 coaxial cable, consider the following:
1. Frequency:
Determine the operating frequency of your RF system and check the cable attenuation at that frequency.
2. Cable Length:
Longer cables produce greater total signal loss. Calculate the expected loss before installation.
3. Connector Type:
Select connectors that match the antenna and RF equipment.
4. Installation Environment:
For outdoor installations, use an appropriate outdoor-rated cable and weatherproof the connections.
5. Bending Radius:
Avoid excessive bending. The standard LMR-400 specification lists a minimum bend radius of approximately 25.4 mm.
Buy LMR-400 Coaxial Cable
If you are looking for LMR-400 coaxial cable in India, choose a reliable RF cable supplier that can provide consistent specifications, appropriate cable lengths and compatible RF connectors.
LMR-400 is an excellent choice for applications requiring a 50 Ohm low-loss coaxial cable for antenna, telecom, cellular, WiFi, GPS and wireless communication systems.
Whether you need cable for a 4G/5G antenna, cellular booster, WiFi access point, GPS system, RF equipment or telecom project, LMR-400 can provide the combination of low attenuation, strong shielding and durable construction required for professional RF installations.
Order LMR-400 Coaxial Cable
We supply LMR-400 coaxial cable in required lengths and connector configurations for antenna, RF, telecom, wireless communication and networking applications.
Contact us for LMR-400 cable, RF cable assemblies and customized connector options according to your project requirements.
Frequently Asked Questions About LMR-400
Is LMR-400 a 50 Ohm cable?
Yes. Standard LMR-400 is a 50 Ohm coaxial RF cable.
What is the diameter of LMR-400?
The standard LMR-400 has an overall diameter of approximately 10.287 mm (0.405 inch).
What is LMR-400 used for?
LMR-400 is used for antenna feeder runs, RF jumper assemblies, GPS systems, wireless communication equipment and other RF applications.
Is LMR-400 suitable for 4G and 5G?
Yes, LMR-400 can be used in suitable 4G LTE and 5G RF installations where its electrical specifications, attenuation and cable length meet the system requirement.
Is LMR-400 suitable for outdoor use?
Yes. The standard LMR-400 is offered with a PE jacket for outdoor applications and UV resistance.
What is the maximum frequency of LMR-400?
The standard LMR-400 is specified for frequencies up to 8 GHz.
What is the operating temperature of LMR-400?
The standard specification lists an operating temperature range of approximately -40°C to +85°C.
Can LMR-400 be supplied with connectors?
Yes. LMR-400 can be supplied as cable assemblies with suitable RF connectors such as N-type, SMA, TNC and other connector configurations depending on the application.