Robust Bel Fuse 2151-DKF-0024 coaxial cable assembly for commercial and military airframe applications

About Semflex

For over 40 years, Semflex has been a leading manufacturer of high-quality coaxial cable, offering expertise in rapid design and manufacturing of cable solutions for diverse environmental, mechanical, and electrical conditions. As a vertically integrated company, Semflex produces high-performance RF/Microwave cables, cable assemblies, and connectors for a global clientele of high-technology firms. Semflex is committed to customer success by providing cost-effective, one-stop shopping solutions, reducing time to market with rapid turnaround for new designs, and increasing system reliability through high-quality products that exceed specifications.

Industries Served

• Missile Guidance Systems
• Communication Systems
• High Power Applications
• Phased Array Radars
• Professional Audio
• Industrial Lasers
• Medical MRI
• Land, Sea, and Airborne Military Weapons Platforms
• Electronic Counter Measures and Jammers
• Cellular Antennas and Base Stations
• Satellite Antennas and Earth Stations
• Commercial and Military Airframes
• Precision Test and Measurement
• Semiconductor Sputtering

Product Series Overview

HPI/LAI Series

The HPI/LAI Series offers the most customer-configurable cable assemblies, with options for phase matching and custom marking available upon request. These assemblies can be configured with high-performance HP cable series or low-attenuation LA cable series, featuring a wide selection of interfaces and cable jackets. All connectors are designed to meet MIL-C-39012 standards and ensure optimal cable fit and transition. Applications extend up to 50GHz.

HPT Series

The HPT Series is available with high-performance HP cable series and features a heavy-duty, hot-molded rubber boot for exceptional strain relief and extended lifespan. Connectors are specially designed for excellent adhesion to the boot, and all interfaces meet MIL-C-39012 standards. This series is ideal for lab and production testing and high flexure applications up to 50GHz.

DKF Series

The DKF Series is available with high-performance HP190S cable and features a heavy-duty slip-on rubber boot for strain relief. Connectors are designed for excellent adhesion to the boot, and all interfaces meet MIL-C-39012 standards. Available in standard lengths with straight male connectors, this series is stocked by distributors for lab and production applications up to 18GHz.

SWI Series

The SWI Series offers a higher performance alternative to RG series cable assemblies, available with SW series cable. All interfaces meet MIL-C-39012 standards. This series is ideal for in-box or in-cabinet applications up to 18GHz.

KW Series

The KW Series offers ultra-low attenuation comparable to rigid, corrugated, air-dielectric cables, combined with higher power ratings and exceptional flexibility. Featuring a copper clad aluminum conductor and a pliable polyurethane jacket, these cables are suitable for tight installation spaces like cabinets and airframes, reducing system integration costs. Applications include those requiring improved flexibility over corrugated cables, tight installation spaces, ultra-low loss, and high power, up to 14GHz.

SW Series

The SW Series provides low-loss cable solutions that bridge the gap between lower-performance RG cables and high-performance options. Utilizing microporous PTFE dielectrics and a simple double braid construction, this series offers exceptional electrical performance and simplified connector attachments for cost reduction. Cable sizes SW060, SW086, and SW150 can be assembled with standard semi-rigid or RG style crimp-on connectors. Ideal for RF and MW applications requiring interconnects for racks, cabinets, enclosures, miniature flex cable diameters, broad temperature extremes, and tight bends.

SM Series

The SM Series offers a flexible alternative to semi-rigid cable, utilizing the same connectors and assembly tooling as 0.086 and 0.141 versions. This eliminates the need for complex 3D drawings, leading to cost savings and accelerated time to market. It is ideal for applications such as military ECM and guidance systems, commercial antennas, and communication systems where compact or densely-spaced coaxial interconnects are required. Applications include semi-rigid replacement, military and commercial applications, densely packed cable systems, communication systems, and commercial antennas.

Cable Constants & Insertion Loss Calculation

Cable Insertion Loss (dB/in) = L x [(k1 x F) + (k2 x F)] / 1200

Connector Loss (dB) = k3 x F

Total Insertion Loss (IL) = Cable Loss + Connector Loss

Where: IL = Insertion Loss (dB), L = Length (in), F = Frequency (GHz)

Technical Specifications

Connector Constants (k3)

VSWR Guide (Max)

Cable Assembly Construction Details

• HPI/LAI Series: Heat Shrink Interface 2, Heat Shrink Interface 1
• HPT Series: Hot Molded Rubber Boot Interface 2, Hot Molded Rubber Boot Interface 1
• DKF Series: Slip On Rubber Boot Interface 2, Slip On Rubber Boot Interface 1
• SWI Series: Interface 1, Interface 2
• KW Series: Extruded Black Polyurethane Jacket
• SW Series: Extruded FEP Jacket
• SM Series: Extruded FEP Jacket - Blue Tint

Cable Construction Materials

• LA Series: Silver Plated Copper (Inner & Outer Conductors), Ultra Low Density Microporous PTFE (Dielectric), Silver Plated Copper Braid (Helical & Round), Extruded FEP Jacket
• HP Series: Silver Plated Copper (Inner & Outer Conductors), Low Density Microporous PTFE (Dielectric), Silver Plated Copper Flat Braid, Metalized Foil, Silver Plated Copper Round Braid, Extruded FEP Jacket
• SW Series: Silver Plated Copper (Inner & Outer Conductors), Low Density Microporous PTFE (Dielectric), Silver Plated Copper Flat Braid, Silver Plated Copper Round Braid, Extruded FEP Jacket
• KW Series: Copper Clad Aluminum (Center Conductor), Low Density Microporous PTFE (Dielectric), Silver Plated Copper Flat Braid, Silver Plated Copper Round Braid, Extruded Black Polyurethane Jacket
• SM Series: Silver Plated Copper Clad Steel (Center Conductor), Solid PTFE Core (Dielectric), Silver Plated Copper Flat Braid, Silver Plated Copper Round Braid, Extruded FEP Jacket - Blue Tint

Jacket Materials

• Polyurethane: Low temperature rating, UV resistant, Abrasion resistant, Flexible (-65 to 85C)
• FEP: High temperature rating, Chemical resistant, Moisture resistant, Low smoke, Low outgassing (-65 to 200C)

Shielding Options

• Triple Shield: Woven flat braid, polyimide foil, round braid (>90 dB shielding effectiveness)
• Double Shield: Helical flat braid, round braid (>100 dB shielding effectiveness)
• Double Shield: Woven flat braid, round braid (>85 dB shielding effectiveness)
• Double Shield: Polyester foil, round braid (>85 dB shielding effectiveness)
• Double Shield: Round braid, round braid (>60 dB shielding effectiveness)
• Single Shield: Round braid (>40 dB shielding effectiveness)

Dielectric Materials

• Polyethylene: Temp (-40 to 85C), VP (66-85%)
• Solid PTFE: Temp (-65 to 125C), VP (70%)
• Low Density PTFE: Temp (-65 to 200C), VP (74-78%)
• Ultra Low Density PTFE: Temp (-65 to 200C), VP (82-85%)

Center Conductor Materials

• Solid Conductors: Less resistance, Lower loss, Higher power
• Stranded Conductors: More flexible
• Silver Plating: Lowest loss, Solderable
• Copper Clad: Cost effective, Solderable

Assembly Lengths

Minimum length: 6 inches. Maximum length: 480 inches.

Standard Length Tolerance:

• 6~119: -0, +0.5
• 120~179: -0, +1
• 180~480: -0, +4

*Contact factory for lengths over 480.

Power Handling

Average power ratings are based on VSWR of 1.0:1, at sea level and an ambient temperature of 25 C. Ratings can be adjusted based on temperature and altitude derating factors.

Connector Types Offered

• SMA Male / Right Angle Male / Bulkhead Female
• TNC Male / Right Angle Male / Bulkhead Female
• N Male / Right Angle Male / Bulkhead Female
• 2.4mm Male / Right Angle Male
• 2.92mm Male / Right Angle Male / Bulkhead Female
• 3.5mm Male / Right Angle Male / Bulkhead Female
• MCX Male / Right Angle Male / Bulkhead Female

Product Attributes

• Brand: Semflex (by Cinch Connectivity Solutions)
• Impedance: 50 Ohms
• Jacket Materials: FEP, Polyurethane
• Dielectric Materials: Polyethylene, PTFE (Solid, Low Density, Ultra Low Density)
• Center Conductor Materials: Silver Plated Copper, Copper Clad Aluminum, Silver Plated Copper Clad Steel
• Shielding: Various braid and foil combinations