0.250" Low Loss Semi‑Rigid Coaxial Cable 50 Ohm SR-250C-LL Feeder Cable for RF System

SR‑250C‑LL is a 0.250" (RG401‑class) 50‑ohm semi‑rigid coaxial cable engineered for applications where low attenuation, stable phase, and robust mechanical performance are all critical. It typically employs a silver plated copper inner conductor, surrounded by a low‑loss dielectric formulated to reduce attenuation while preserving mechanical stability, designed as a low‑loss option within the 0.250" family, giving RF engineers more margin on long runs and higher power links than smaller semi‑rigid sizes can provide. The solid copper tube outer conductor and low density PTFE dielectric deliver excellent shielding and impedance control, helping maintain consistent VSWR and minimizing reflections across the operating band. SR‑250C‑LL is well suited to production assemblies, test infrastructure, and high‑reliability RF systems where repeatable routing and predictable electrical behavior are essential.

• 0.250" (RG401‑class) 50‑ohm semi‑rigid coaxial cable designed specifically as a low‑loss variant for demanding RF paths.
• Reduced insertion loss compared with smaller‑diameter semi‑rigid cables, improving link budgets and easing amplifier requirements on longer runs.
• Solid copper tube outer conductor providing high shielding effectiveness and low radiation, ideal for dense RF environments and sensitive instrumentation.
• Precision PTFE dielectric for stable electrical properties, predictable phase response, and good return loss across the intended frequency range.
• Semi‑rigid construction that supports accurate pre‑forming, cable runs can be bent to defined shapes and held in place without additional supports in many layouts.
• Higher power handling than 0.086" and 0.120" semi‑rigid cables, making SR‑250C‑LL suitable for medium‑ to high‑power transmit or distribution lines.
• Compatible with a broad ecosystem of 0.250" semi‑rigid connectors and hardware, simplifying integration into existing designs and test setups.
• Robust mechanical design suitable for fixed installations that experience vibration, moderate shock, or repeated thermal cycling.

• High‑performance RF and microwave modules – Use SR‑250C‑LL to connect high‑power stages, filters, and combiners inside rack‑mount or cabinet‑based systems where low loss and stable impedance are key.
• Longer internal RF runs in transmitters and distribution systems – Ideal for interconnecting subsystems across a rack, shelter, or equipment room without excessive attenuation.
• Laboratory and production test environments – Employed as semi‑rigid interconnects between signal sources, power amplifiers, loads, and fixtures where repeatability and measurement confidence are required.
• Industrial and scientific RF equipment – Suitable for plasma generators, RF heating units, and experimental setups that demand robust, low‑loss feeder cable with defined routing.
• Custom pre‑formed cable assemblies – Frequently supplied as pre‑bent harnesses with documented lengths, bend angles, and connector orientations to support quick, error‑resistant assembly in production.
• Upgrade paths from smaller semi‑rigid sizes – A practical choice when existing systems based on 0.086"/0.120" coax need lower loss or higher power capability without moving to bulky rigid line.

A: SR‑250C‑LL combines a 0.250" diameter with a low density PTFE dielectric and silver plated copper conductor design optimized to reduce attenuation. In practice, this yields noticeably lower dB of loss over the same distance than smaller semi‑rigid coaxial cables.

A: Check mechanical clearances for the 0.250" diameter, verify connector compatibility, and evaluate your layout for the larger minimum bend radius. Electrically, confirm that the lower loss and higher power handling meet your design goals and that the operating frequency range of SR‑250C‑LL covers your application.

A: For best results and to maintain impedance control, SR‑250C‑LL should be formed using appropriate bending tools or formers designed for 0.250" semi‑rigid coaxial cable. While small adjustments might be possible by hand, relying on proper tooling helps avoid kinks, micro‑cracks in the outer conductor, and unexpected changes in VSWR.

A: Yes. One of the advantages of semi‑rigid construction is its mechanical stability once formed. SR‑250C‑LL’s solid outer conductor and fixed geometry help maintain electrical performance under vibration and repeated temperature changes.

A: When requesting a quote, include the cable type (SR‑250C‑LL), required assembly lengths, connector series and gender on each end, target frequency range, approximate power levels, and environmental requirements (temperature range, vibration, indoor/outdoor use). If you need pre‑formed assemblies, supply drawings or 3D models showing bend radii, angles, and connector orientation. You can also specify test requirements such as VSWR limits, insertion loss plots, or phase matching between multiple assemblies.