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High-performance 75Ω RF pigtail featuring BNC Female Bulkhead to MCX Male Right Angle plug. Built with high-temp RG179 PTFE coax for video, broadcast, and compact RF routing.
This specialized 75-ohm RF cable assembly is engineered for high-frequency video, broadcast, and telecommunications applications where impedance matching is critical. It features a BNC Female Bulkhead jack for secure panel or enclosure mounting, transitioning to an MCX Male 90-degree (right angle) plug designed for space-constrained PCB or module connections.
Utilizing RG179 PTFE coaxial cable, this pigtail jumper provides excellent signal integrity, high-temperature resistance, and a flexible, micro-thin profile. The 75Ω impedance ensures minimal signal reflection and optimal return loss for standard video and broadcast frequency bands.
Parameter | Specification |
Impedance | 75 Ohm (Strictly matched for video/broadcast standards) |
Connector A | BNC Female Bulkhead Jack Panel mount with hex nut and D-washer Nickel/Gold-plated brass, PTFE dielectric |
Connector B | MCX Male 90° Plug (Right Angle) Snap-on coupling mechanism Gold-plated brass body, PTFE dielectric |
Cable Type | RG179/U (75Ω, ultra-thin, high-temp) |
Cable Construction | Center: Silver-plated copper-clad steel (7/0.102mm) Dielectric: Extruded PTFE (0.84mm OD) Shield: Silver-plated copper braid (>95% coverage) Jacket: FEP (Teflon) |
Outer Diameter (OD) | ~1.80 mm (0.071 inches) |
Temperature Rating | -55°C to +200°C (FEP/PTFE construction) |
Capacitance | 64 pF/m (Lower capacitance optimized for 75Ω video signals) |
Voltage Rating | 150 VAC max |
VSWR | ≤ 1.25:1 (DC to 3 GHz) |
Frequency Range | DC to 6 GHz (Optimized performance up to 3 GHz for SDI/HD video) |
Standard Lengths | 15cm, 30cm, 50cm, 1m (Custom lengths available) |
1. True 75-Ohm Impedance Matching
Unlike standard 50-ohm RF assemblies, this cable is strictly engineered to 75 ohms. Using a 50-ohm cable in a 75-ohm video system (like SDI or broadcast routing) causes impedance mismatches, leading to signal reflections, ghosting, and data errors. The RG179 cable and precision-machined connectors ensure a continuous 75Ω pathway.
2. Bulkhead BNC for Secure Panel Integration
The BNC Female Bulkhead connector includes a threaded barrel, hex nut, and lock washer. This allows the connector to be permanently and securely mounted to equipment chassis, rear I/O panels, or patch bays, providing a robust external interface.
3. 90-Degree MCX for High-Density Routing
The MCX Male right-angle plug minimizes the vertical clearance required above the PCB or connection point. This 90-degree geometry is critical in compact enclosures, multi-channel video multiplexers, and dense RF modules where straight connectors would interfere with chassis lids or adjacent components.
4. High-Temperature PTFE/FEP Materials
The solid PTFE dielectric and FEP outer jacket allow the RG179 cable to withstand reflow soldering temperatures and continuous operating temperatures up to 200°C. This prevents the dielectric from melting or deforming during assembly or in high-heat equipment environments.
Industry / Field | Specific Use Case |
Broadcast & Pro Video | Internal routing of SDI (Serial Digital Interface) signals between PCBs and rear-panel BNC I/O in video switchers and routers. |
Telecommunications | Connecting 75-ohm GPS timing receivers or synchronization modules to external bulkhead antennas. |
Test & Measurement | Patch cables for video analyzers, waveform monitors, and broadcast testing equipment. |
Medical Imaging | Routing high-frequency video signals inside endoscopy towers and ultrasound machines. |
Aerospace & Avionics | In-flight entertainment (IFE) system video distribution and cabin camera routing. |
1. Impedance & TDR Testing
Time Domain Reflectometry (TDR) is used to verify the continuous 75-ohm impedance across the entire assembly, ensuring no impedance spikes at the connector-to-cable transition points.
2. MCX Retention Force Testing
The snap-on mechanism of the MCX connector is tested for axial pull-off force to ensure it meets MIL-PRF-39012 standards, guaranteeing a secure connection that will not easily detach under vibration.
3. High-Potential (Hi-Pot) Testing
Each assembly is tested at 500VDC to verify the integrity of the PTFE dielectric and ensure there is no electrical leakage between the center conductor and the outer shield.
4. Visual & Mechanical Inspection
Connectors are inspected under magnification to verify gold plating quality, proper center pin alignment, and the absence of solder wicking into the mating areas.
Standard Packaging: Individually coiled and sealed in anti-static, moisture-barrier bags.
Labeling: Tagged with "75Ω BNC(F) Bulkhead to MCX(M) RA | RG179 | [Length]".
Lead Time: Standard lengths ship within 24 hours. Custom lengths require 3–5 days.
MOQ: 1 piece for stock lengths; 50 pieces for custom lengths.
Q1: Can I use this 75-ohm cable for standard Wi-Fi or cellular antennas?
A: No. Wi-Fi, cellular, and most two-way radio systems use 50-ohm impedance. Using a 75-ohm cable in a 50-ohm system will cause an impedance mismatch, resulting in signal reflection and degraded performance. This cable is strictly for 75-ohm systems (video, broadcast, GPS timing).
Q2: What is the advantage of the Bulkhead BNC connector?
A: A standard BNC connector is designed to mate at the end of a cable. A Bulkhead BNC features a threaded barrel and mounting hardware, allowing it to be securely fastened through a hole in a metal or plastic panel. This provides a fixed, durable connection point on the exterior of equipment.
Q3: How much clearance does the 90-degree MCX plug require?
A: The right-angle MCX plug typically requires only about 8mm to 10mm of vertical clearance from the PCB surface, compared to 15mm+ for a straight plug. This makes it ideal for slim enclosures.
Q4: Is RG179 the same as RG178?
A: They have similar physical dimensions (both ~1.8mm OD), but different electrical properties. RG178 is a 50-ohm cable, while RG179 is a 75-ohm cable. They are not interchangeable in impedance-sensitive applications.
Panel Mounting the Bulkhead BNC: When installing the BNC Female Bulkhead connector into a panel, use the provided D-washer (anti-rotation washer) to prevent the connector from spinning when mating or un-mating the external BNC plug. Torque the hex nut to 1.5 N·m.
MCX Snap-On Connection: To connect the MCX plug, align it squarely with the MCX jack and push straight down until you feel and hear a distinct "click." Do not twist or force it. To disconnect, use an MCX extraction tool or pull the outer sleeve straight back; never pull by the cable itself.
Bend Radius Limitation: Although RG179 is highly flexible, maintain a minimum static bend radius of 10mm to prevent deformation of the PTFE dielectric, which could alter the local 75-ohm impedance.
Soldering Precautions: If re-terminating or modifying the assembly, use a temperature-controlled soldering iron. The PTFE dielectric has a very high melting point, but the FEP outer jacket can melt if exposed to excessive heat for prolonged periods.
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