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LMR-400 is the cornerstone of 50 ohm coaxial cables, achieving an excellent balance between low loss and relatively easy installation. If you need lower losses than thin cables (such as LMR-195, LMR-240) and don't want to use bulky and expensive thick cables (such as LMR-600 or feed tubes), then LMR-400 is a very reliable and universally applicable choice. It is a highly respected model in amateur radio, professional wireless communication, and radio frequency engineering.
| Structure parameters | ||
| Item | Material | Diamenter (mm) |
| Inner Conductor | Copper clad aluminum wire | 2.74 |
| Dielectric | PTFE | 7.24 |
| Outer Conductor | Tin plated copper wire weaving | 8.1 |
| Sheath | PE | 10.16 |
| Performance parameters | ||
| Capacitor | 78.4pF/m | |
| Impedance | 50ohm | |
| Transmission rate | 85% | |
| Internal conductor DC resistance | 4.91 OHM/m | |
| Outer conductor DC resistance | 5.41 OHM/m | |
| Maximum operating voltage | 8000Vrms | |
| Maximum operating frequency | 16000W | |
| Working temperature range | -40～+80℃ | |
| Bending radius | 51mm | |
| ROHS/CE/FCC | YES | |
| Frequency | 30MHz | 2.2dB/m |
| 50MHz | 2.9dB/m | |
| 150MHz | 5.0dB/m | |
LMR400 coaxial cable - the king of low loss, with high frequency signal transmission efficiency surpassing thin cables: at 2.4GHz (WiFi/5G frequency band), the loss is only 60% of LMR-240, and the signal strength is increased by 40% for the same distance transmission.
Long distance preferred: Transmitting 5GHz signals within 30 meters can still maintain usable strength, while regular cables may have failed Ultimate anti-interference ability with dual shielding structure and dual guarantee: the aluminum foil layer covers 100% of the conductor, completely blocking high-frequency interference; High density copper mesh shields low-frequency noise and is suitable for high interference scenarios such as airports and substations.
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