LMR-300 Coaxial Cable – 50 Ohm Low Loss RF Cable for Wireless Communication
LMR-300 Coaxial Cable is a high-performance 50 Ohm low-loss RF cable designed for reliable signal transmission in wireless communication, antenna, networking and RF applications. With a compact 7.62 mm outer diameter, flexible construction and effective double shielding, LMR-300 offers an excellent balance between low signal loss, flexibility, durability and easy installation.
LMR-300 coaxial cable is widely used for antenna feeder connections, jumper assemblies, wireless communication equipment, GPS systems, WLAN, WISP, WiMAX, SCADA and mobile antenna installations. The cable is particularly suitable for applications where a reliable RF connection and easy cable routing are important.
According to the manufacturer’s specifications, standard LMR-300 has a 50 Ohm impedance, solid bare copper center conductor, foam polyethylene dielectric, aluminum tape shielding and tinned copper braid. It provides shielding effectiveness of more than 90 dB and operates from approximately -40°C to +85°C.
What is LMR-300 Coaxial Cable?
LMR-300 is a flexible, low-loss RF coaxial cable developed for wireless and communication applications. The “300” designation corresponds approximately to its 0.300-inch (7.62 mm) outside diameter.
Unlike ordinary coaxial cables that may be intended for general-purpose applications, LMR-300 is designed specifically for RF signal transmission. Its 50 Ohm impedance makes it suitable for many antenna and wireless communication systems.
The cable construction combines a solid bare copper center conductor with a low-loss foam polyethylene dielectric and a combination of aluminum foil and tinned copper braid shielding. This construction helps maintain signal integrity while providing strong protection against electromagnetic interference.
Key Features of LMR-300 Cable
- 50 Ohm RF impedance
- Low-loss coaxial cable construction
- Approx. 7.62 mm outer diameter
- Solid bare copper center conductor
- Foam polyethylene dielectric
- Aluminum foil shielding
- Tinned copper braid
- More than 90 dB shielding effectiveness
- Flexible and easy to route
- Suitable for indoor and outdoor RF installations depending on jacket type
- Operating temperature approximately -40°C to +85°C
- Suitable for antenna feeder and jumper applications
- Available with various RF connector configurations
The standard LMR-300 construction has a velocity of propagation of approximately 82%, with the manufacturer’s datasheet listing attenuation values across frequencies from 30 MHz through 8 GHz.
LMR-300 Coaxial Cable Construction
The performance of LMR-300 comes from its carefully designed internal construction.
1. Solid Copper Center Conductor
The center conductor provides the primary path for RF signal transmission. The standard construction uses solid bare copper, helping provide good electrical conductivity and low DC resistance.
2. Foam Polyethylene Dielectric
A foam polyethylene dielectric surrounds the center conductor. This low-density dielectric helps reduce dielectric losses and provides an approximately 82% velocity of propagation in the standard cable.
3. Aluminum Foil Shield
An aluminum tape shield provides an additional barrier against unwanted electromagnetic interference and helps maintain RF signal integrity.
4. Tinned Copper Braid
A tinned copper braid is added over the foil shield, providing additional shielding and mechanical protection.
5. Protective Outer Jacket
The outer jacket protects the cable from environmental exposure and mechanical damage. Different LMR-300 versions are available for particular indoor, outdoor, riser and other installation requirements.
Applications of LMR-300 Coaxial Cable
LMR-300 is suitable for a wide range of RF and wireless communication applications, including:
- 4G LTE antenna systems
- 5G wireless communication systems
- Cellular antennas
- Mobile network equipment
- WiFi and WLAN systems
- GPS antenna installations
- WISP networks
- WiMAX systems
- SCADA communication
- Wireless LAN
- RF equipment connections
- Antenna feeder systems
- RF jumper assemblies
- Outdoor wireless installations
- Telecom and networking equipment
Why Choose LMR-300 Cable?
Choosing the correct coaxial cable is important because cable loss directly affects the amount of RF signal reaching an antenna or radio system.
LMR-300 provides a useful balance between cable size, flexibility and RF performance. Its 7.62 mm diameter makes it more substantial than smaller flexible coaxial cables while remaining easier to route than many larger feeder cables.
The cable also provides strong shielding performance, with the standard specification listing greater than 90 dB shielding effectiveness.
For short and medium RF connections where installation flexibility is important, LMR-300 can be an excellent choice.
LMR-300 Cable Attenuation
RF cable attenuation increases as frequency increases. For example, the manufacturer’s typical specifications list approximately:
| Frequency | Typical Attenuation |
|---|---|
| 450 MHz | 13.8 dB/100 m |
| 900 MHz | 19.9 dB/100 m |
| 1800 MHz | 28.7 dB/100 m |
| 2000 MHz | 30.3 dB/100 m |
| 2500 MHz | 34.2 dB/100 m |
| 5800 MHz | 54.2 dB/100 m |
| 8000 MHz | 65.0 dB/100 m |
LMR-300 for 4G and 5G Antenna Systems
Modern cellular networks require good-quality RF connections between radios, boosters, antennas and other RF equipment. LMR-300 can be used in suitable 4G LTE and 5G RF installations, particularly where cable lengths are controlled to minimize signal loss.
For cellular antenna installations, selecting the correct connector, maintaining proper cable routing and avoiding excessive bending are just as important as selecting the cable itself.
LMR-300 RF Cable Connectors
LMR-300 can be terminated with different RF connectors depending on the equipment being connected.
Common connector options include:
- N Male
- N Female
- SMA Male
- SMA Female
- TNC
- BNC
- Other customized RF connectors
The connector should always be selected according to the RF equipment and antenna interface.
LMR-300 Cable for Antenna Feeder Applications
A coaxial feeder cable connects RF equipment to an antenna and carries the RF signal between the two points. Using a low-loss cable helps reduce unnecessary signal attenuation.
LMR-300 is designed for short antenna feeder runs and RF jumper assemblies, making it useful for wireless communication installations where flexibility and manageable cable size are important.
LMR-300 vs Standard Coaxial Cable
Not all coaxial cables provide the same RF performance. Cable diameter, conductor material, dielectric construction, shielding and frequency range all affect performance.
LMR-300 uses a solid copper conductor, foam polyethylene dielectric and dual shielding construction. This makes it a specialized RF cable rather than simply a general-purpose coaxial wire.
When selecting between LMR-300 and other cables such as LMR-195, LMR-240 or LMR-400, consider:
- Required cable length
- Operating frequency
- Acceptable signal loss
- Installation space
- Required flexibility
- Connector type
- Indoor or outdoor installation
- Mechanical requirements
How to Select the Right LMR-300 Cable
1. Cable length:
Longer cables generally produce greater signal loss, so calculate the expected attenuation for your operating frequency.
2. Frequency:
Cable attenuation varies with frequency. Always check the cable specification for your required frequency.
3. Connector:
Make sure both ends have the correct connector type for your antenna and RF equipment.
4. Installation environment:
Choose the appropriate jacket construction for indoor or outdoor use.
5. Bending requirements:
Avoid unnecessarily tight bends. The manufacturer’s specifications list an installation bend radius of approximately 22.2 mm and a repeated bend radius of approximately 76.2 mm.
Buy LMR-300 Coaxial Cable
If you are looking for a reliable 50 Ohm LMR-300 coaxial cable for RF, telecom, antenna, WiFi, cellular or wireless communication applications, choose a cable with verified specifications and suitable connectors for your system.
LMR-300 offers an effective combination of low-loss RF performance, flexible construction, strong shielding and easy installation, making it a practical choice for antenna feeder and RF jumper applications.
Whether you need LMR-300 for a 4G/5G antenna, WiFi system, GPS installation, wireless network, RF equipment or telecom project, selecting the correct cable length and connector configuration will help achieve reliable RF performance.
Order LMR-300 Coaxial Cable
Contact us for LMR-300 coaxial cable in required lengths and connector configurations for your RF and wireless communication requirements.
Is LMR-300 a 50 Ohm cable?
Yes. Standard LMR-300 is a 50 Ohm coaxial RF cable.
What is the diameter of LMR-300?
The standard LMR-300 has an overall diameter of approximately 7.62 mm (0.300 inch).
What is LMR-300 used for?
LMR-300 is used for antenna feeder runs, RF jumper assemblies, wireless communication, GPS, WLAN, WISP, WiMAX, SCADA and mobile antenna systems.
Is LMR-300 suitable for 4G and 5G?
It can be used for suitable 4G LTE and 5G RF installations, provided the cable length and attenuation are appropriate for the operating frequency.
What connectors can be used with LMR-300?
LMR-300 cable assemblies can be supplied with different RF connectors such as N-type, SMA, TNC and other connector types depending on the equipment.
Is LMR-300 suitable for outdoor use?
Outdoor-rated LMR-300 versions are available with appropriate PE jackets. The exact cable construction should be selected according to the installation environment.
What is the operating temperature of LMR-300?
The standard specification lists an operating temperature range of approximately -40°C to +85°C.