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Bridging the gap between rugged, high-power outdoor infrastructure and high-density, rapid-deployment indoor systems, this Factory N Type Male to QMA Male Plug RF Coaxial Cable Assembly offers unparalleled versatility. By combining the robust, weather-resistant threaded coupling of the N-Type connector with the quick-lock, tool-free installation of the QMA interface, this assembly provides a seamless transition between macro and micro RF environments.
Supported by an exhaustive matrix of industry-standard coaxial cables—including the ultra-flexible RG58/RG223, the heavy-duty RG8/RG213/RG214, and the premium low-loss LMR series (LMR100 to LMR400)—this pigtail can be precisely tailored to your exact attenuation, power handling, and routing requirements. Manufactured directly by our facility, it guarantees strict 50-ohm impedance control, superior shielding, and factory-direct pricing for telecommunications, aerospace, and advanced test & measurement applications.
Parameter | Specification |
Impedance | 50 Ohm |
Connector A | N Type Male Plug• Threaded coupling (5/8"-24 UNEF)• Brass body, nickel/ternary alloy plated• PTFE dielectric, gold-plated center pin |
Connector B | QMA Male Plug• Quick-lock snap-on coupling• Brass body, nickel/gold-plated• PTFE dielectric |
Frequency Range | DC to 11 GHz (Standard N-Type) / DC to 18 GHz (Precision N-Type & QMA) |
VSWR | ≤ 1.20:1 (DC to 3 GHz) / ≤ 1.35:1 (DC to 11 GHz) Varies slightly by cable type |
Power Handling | Up to 1500W @ 1 GHz (with LMR400/RG8/RG213) |
Mating Cycles | N-Type: 500 min / QMA: 100 min |
Temperature Rating | -55°C to +155°C (PTFE/FEP cables) / -40°C to +85°C (PE/PVC cables) |
Compliance | RoHS 2.0, REACH |
Cable Series | Type & Shielding | Outer Diameter (OD) | Best Application Profile |
LMR100 / LMR195 / LMR200 | Ultra-Low Loss, Flexible, Double Shield | 2.79mm / 4.95mm / 5.08mm | Compact routing, Wi-Fi, short jumpers, IoT devices. |
LMR240 / LMR400 | Ultra-Low Loss, Thick, Double Shield | 6.35mm / 10.29mm | Long-distance runs, base station main feeds, high power. |
RG58 / RG223 | Standard Loss, Flexible (RG223 is Double Shield) | 4.95mm / 5.10mm | General purpose, cost-effective test leads, lab routing. |
RG8 / RG213 / RG214 | Low Loss, Heavy Duty (RG214 is Double Shield) | 10.30mm / 10.80mm | High power transmission, broadcast, heavy industrial. |
1. Strategic Interface Transition (N-Type to QMA)
This assembly solves a common system integration challenge: connecting rugged, outdoor-rated N-Type ports (common on amplifiers, antennas, and base stations) to high-density, indoor QMA panels or test equipment. The N-Type provides a secure, weather-sealed threaded lock, while the QMA allows for rapid, blind-mate installation on the equipment side.
2. Broad Spectrum Low-Loss Cable Integration
Unlike standard jumpers limited to one or two cable types, our factory supports the entire spectrum of 50-ohm coaxial cables. Whether you need the extreme flexibility of LMR100 for tight enclosures, or the ultra-low attenuation of LMR400 for 50-meter tower runs, we crimp and solder the exact cable your system demands.
3. Precision CNC Machined Connectors
Both the N-Type and QMA connectors are CNC-machined from high-grade brass. The N-Type features a robust captive contact and weatherproof gasket (on specific models), while the QMA utilizes a beryllium copper internal spring mechanism for reliable, vibration-proof quick-locking.
4. Optimized Impedance Matching
Transitioning between different connector sizes (N-Type to QMA) and varying cable diameters can cause signal reflections. Our engineering team utilizes precision-machined internal transition pins and optimized solder joints to maintain a constant 50-ohm impedance throughout the assembly, minimizing VSWR.
Industry / Field | Specific Use Case |
Telecommunications | Transitioning from outdoor macro cell N-Type antennas to indoor QMA distribution panels or RRH (Remote Radio Head) testing. |
Test & Measurement | Custom test leads connecting high-power RF amplifiers (N-Type) to dense switch matrices or VNA ports (QMA). |
Aerospace & Defense | Ground support equipment (GSE), radar test benches, and avionics harnesses requiring mixed-interface connectivity. |
Broadcasting | Connecting high-power FM/TV transmitters (N-Type/RG8) to studio routing and monitoring equipment (QMA). |
Marine & GPS | Shipboard communication systems, connecting mast-mounted N-Type GPS/VHF antennas to below-deck QMA receivers. |
1. Advanced Crimping & Soldering Techniques
We utilize hex-crimp tooling for braided cables (RG58, LMR series) and precision solder-crimp methods for large-diameter cables (RG8, LMR400, RG213). Center pins are silver-soldered to ensure maximum power handling and minimal contact resistance.
2. 100% VNA Electrical Verification
Every cable assembly is swept on a calibrated Vector Network Analyzer. We generate and provide a test report verifying Insertion Loss and Return Loss (VSWR) across the requested frequency band before shipping.
3. Mechanical Integrity Testing
Samples from every production batch undergo rigorous pull-testing to ensure the crimp ferrules and solder joints exceed the tensile strength of the cable itself. N-Type connectors are also torque-tested to ensure thread durability.
Packaging & Logistics
• Standard Packaging: Cables are coiled respecting their specific minimum bend radius (especially critical for LMR400 and RG8) and sealed in heavy-duty, anti-static PE bags.
• Labeling: Each bag features a detailed label including Part Number, Connector types, Exact Cable Type (e.g., LMR240), Length, and Batch Number.
• Lead Time: Standard RG58/LMR195 configurations ship in 3-5 days. Heavy-duty (LMR400/RG8) or custom lengths require 7-10 business days.
• MOQ: 5 pieces for standard cables; 50 pieces for specialized heavy-duty or custom-length runs.
Q1: How do I choose between the LMR series and the RG series cables?
A: The LMR series (e.g., LMR195, LMR400) uses foam PE dielectric, offering significantly lower signal loss (attenuation) and better flexibility than the solid PE dielectric used in traditional RG cables (e.g., RG58, RG8). We highly recommend the LMR series for any application where signal loss over distance is a critical factor. Choose RG214 or RG223 if your military or aerospace spec specifically mandates double-shielded MIL-C-17 standard cables.
Q2: Can the N-Type connector be used outdoors?
A: Yes, the N-Type connector is inherently weather-resistant. However, for long-term outdoor exposure, we recommend adding a waterproof heat-shrink tube over the connector-to-cable boot, or using our optional IP67-rated N-Type variant with an integrated O-ring seal.
Q3: What is the maximum power this assembly can handle?
A: Power handling is dictated by the cable and the N-Type connector. With heavy-duty cables like LMR400, RG8, or RG213, this assembly can handle up to 1500W CW at 1 GHz. For thinner cables like RG58 or LMR100, power handling is limited to roughly 100W-200W. Please specify your power requirements when ordering.
Q4: Is the QMA connector compatible with SMA?
A: No. While QMA is based on the SMA interface dimensions, it uses a push-on quick-lock mechanism instead of threads. You cannot plug a QMA male into an SMA female without a specific QMA-to-SMA adapter.
1. Torque the N-Type: When mating the N-Type male connector, hand-tighten first, then use a torque wrench to tighten to the recommended 5-8 in-lbs (0.56-0.90 N·m). Do not overtighten, as this can damage the internal dielectric.
2. Snap the QMA: For the QMA male, simply push it straight into the female jack until it clicks. To remove, pull back the outer sliding sleeve and pull straight out. Never pull by the cable.
3. Respect Bend Radii: Thick cables like LMR400 and RG8 have a large minimum bend radius (typically 50mm to 100mm). Bending them too sharply will crush the foam dielectric, permanently altering the impedance and causing high VSWR.
4. Weatherproofing: For outdoor N-Type connections, wrap the mated interface with UV-resistant self-amalgamating tape or apply a weatherproofing boot to prevent moisture ingress.
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