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Bridge the gap between legacy UHF equipment and modern TNC devices with our 50 Ohm LMR-400 / KMR-400 RF Cable Assembly. Featuring a classic UHF PL-259 Male plug on one end and a precision TNC Male plug on the other, this low-loss jumper is engineered for demanding applications where signal integrity is critical. Built with premium LMR-400 equivalent (KMR-400) foam-dielectric coaxial cable, it delivers up to 40% lower attenuation than standard RG-8, making it the professional choice for long cable runs, base stations, and high-performance antenna systems. Factory-direct pricing, fully customizable lengths, and 100% QC tested.
Parameter | Specification Details | ||
Cable Type | LMR-400 / KMR-400 (Low Loss Foam PE Coax) | ||
End A | UHF PL-259 Male (Plug) – Threaded Coupling | ||
End B | TNC Male (Plug) – Threaded Coupling | ||
Impedance | 50 Ohms | ||
Frequency Range | DC – 6 GHz (TNC) / DC – 300 MHz (PL-259) | ||
VSWR | ≤ 1.25 (Up to 3 GHz) | ||
Attenuation | ~5.9 dB/100ft @ 1 GHz / ~9.0 dB/100ft @ 2.4 GHz | ||
Connector Material | Brass with Silver/Tri-metal Plating | ||
Center Contact | Silver-Plated Brass / Beryllium Copper | ||
Dielectric | Foam PE (F-PE) | ||
Cable Jacket | PE (Polyethylene) – UV & Weather Resistant | ||
Shielding | Aluminum Tape + Tinned Copper Braid (>90 dB) | ||
Temperature Range | -40°C to +85°C | ||
Bend Radius (Min) | 25mm (Single Bend) | ||
Certifications | RoHS, REACH, CE, ISO9001 Factory Audited | ||
● Ultra-Low Loss LMR-400 / KMR-400 Cable: The foam PE dielectric and dual-shield construction deliver significantly lower attenuation than RG-8 or RG-213, preserving your signal strength over long cable runs at HF, VHF, UHF, and even 2.4 GHz frequencies.
● Versatile PL-259 to TNC Interface: Seamlessly connect legacy Ham radio transceivers, antenna tuners, and SWR meters (SO-239 ports) to modern TNC-equipped devices such as Wi-Fi access points, cellular modems, and RF test equipment.
● Dual Shielding for Maximum Isolation: The combination of aluminum tape and tinned copper braid provides >90 dB shielding effectiveness, blocking EMI/RFI interference in congested RF environments.
● Precision TNC Male Connector: The threaded TNC interface offers a secure, vibration-resistant connection with excellent performance up to 6 GHz, making it ideal for Wi-Fi (2.4/5.8 GHz), GPS, and microwave applications.
● Rugged & Weather-Ready: The black PE outer jacket is UV-stabilized and waterproof, designed for permanent outdoor installations on towers, rooftops, and marine vessels.
● Customizable Lengths: Available from short 1ft pigtails to 50ft+ extension cables, fully tailored to your installation requirements.
● 100% Factory QC: Every assembly is individually tested for VSWR, insertion loss, and mechanical integrity before shipping.
● Ham Radio & Amateur Stations: Connecting HF/VHF/UHF transceivers (with SO-239 ports) to external TNC-equipped antenna tuners, digital mode interfaces, or remote antenna switches.
● Wi-Fi & Wireless Networking: Bridging TNC-equipped Wi-Fi access points, repeaters, or outdoor CPEs to high-gain antennas with UHF connectors.
● Cellular & LTE/4G Boosters: Interconnecting signal amplifiers, donor antennas, and indoor distribution antennas in commercial building coverage systems.
● GPS & GNSS Systems: Low-loss jumper cables for connecting GPS receivers to active external antennas on vehicles, ships, or base stations.
● RF Test & Measurement: Patch cables for spectrum analyzers, signal generators, and network analyzers in lab and field environments.
● Broadcast & Public Safety: Jumper cables for FM/TV broadcast chains, repeater systems, and emergency communication networks.
As a direct RF cable assembly manufacturer, we offer comprehensive customization:
● Custom Lengths: From 6-inch pigtails to 100ft+ runs, cut to your exact specifications.
● Cable Options: LMR-240, LMR-600, RG-8X, or RG-213 alternatives for different loss/power requirements.
● Connector Alternatives: Swap to N-Type, BNC, SMA, RP-SMA, or 7/16 DIN for specific equipment interfaces.
● Right-Angle Options: Right-angle TNC or PL-259 connectors for tight-space installations.
● Weatherproofing: Pre-installed heat shrink boots or self-amalgamating tape for outdoor connections.
● Private Labeling: Custom logos on connectors, branded packaging, and retail-ready polybags.
● Fast Lead Times: Standard orders ship in 5-7 days; custom OEM orders in 15-20 days.
Q1: What is the difference between LMR-400 and KMR-400?
A: LMR-400 is the original Times Microwave brand name, while KMR-400 is a high-quality equivalent manufactured to the same electrical and mechanical specifications. Both offer identical attenuation, impedance, and power handling characteristics. We supply both options based on customer preference and budget.
Q2: Can I use this cable for 2.4 GHz Wi-Fi?
A: Yes! The TNC connector is rated up to 6 GHz and performs excellently at 2.4 GHz and 5.8 GHz. The LMR-400 cable has low loss at these frequencies (~9 dB/100ft @ 2.4 GHz). However, note that the PL-259 connector is only recommended up to 300 MHz. If your application requires UHF frequencies above 300 MHz on both ends, consider an N-Type to TNC configuration.
Q3: Is this cable suitable for outdoor and tower installations?
A: Absolutely. The LMR-400/KMR-400 cable features a UV-resistant PE jacket and is designed for long-term outdoor use. We also offer optional weatherproofing kits (heat shrink, cold shrink, or self-amalgamating tape) to protect the connectors from moisture ingress on towers and rooftops.
Q4: Do you offer bulk pricing for distributors and installers?
A: Yes! We provide tiered volume discounts for B2B buyers, telecom installers, and retail distributors. Contact our sales team for a custom quote based on your order quantity.
Q5: Are the connectors crimped or soldered?
A: We use crimp-on connectors for LMR-400 cable, which is the industry standard for this cable type. Crimping provides a consistent, reliable connection that matches the cable's impedance profile, ensuring low VSWR and long-term durability.
Need low-loss, field-ready RF jumpers that connect your legacy and modern equipment?
Partner with a trusted factory for consistent quality, competitive pricing, and full customization. Whether you need 10 cables for a repeater site or 5,000 cables for a national rollout, we deliver on time, every time.
👉 Request a Quote & Free Sample Today!
● Email: minna_liao@bjdz.top
● WhatsApp / WeChat: +86 186 2128 3578
● Contact our RF engineering team now for custom lengths, connector options, and OEM packaging!
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