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industrial data rf cable series100 Ω Balanced (2 × 50 Ω Coax)< 1 nT Stray Magnetic Signature> 100 dB CMRR & Shielding

TWISTCOAX Balanced Twin-Coaxial Low-Magnetic-Signature Precision100 Ω balanced (2 × 50 Ω) twin-coaxial low-magnetic-signature precision measurement cable

Balanced twin-coaxial low-magnetic-signature precision measurement cable (TWISTCOAX) combining two matched 50 Ω coaxial lines (100 Ω differential) twisted inside an overall non-magnetic silver-plated OFHC copper braid (μr < 1.0005) for fusion and MRI sensors.

Low-EMC design
EMC screen
Approved
Flame-retardant
Order designation
TWISTCOAX-26L Low-Loss
Outer Ø ≈
5.10 mm
Wall thickness
0.45 mm
Total weight ≈
52.0 kg/km
Min. bend R (fixed)
31 mm
All sizes (8)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Impedance
100 Ω ± 2 Ω
Differential (2 × 50 Ω ± 1 Ω)
Phase match
< 5 ps/m skew
Matched dual coaxial cores
Shielding
> 105 dB
Individual + overall SPC braids
Magnetic sig.
μr < 1.0005
100 % non-magnetic OFHC/SPC
Temperature
-65…+200 °C
PTFE/FEP · -40…+105 °C LSZH
Velocity (VoP)
70 % – 80 %
Solid PTFE or microporous ePTFE

Typical values for this cable type, based on IEC 61196-1 / IEEE Tokamak & Magnetometer Balanced Twin-Coaxial Spec — confirmed in the datasheet and quotation for your order.

Application fit

Is TWISTCOAX right for your machine?

Specify TWISTCOAX for tokamak fusion magnetic pickup coils (Mirnov / Rogowski loops), particle-accelerator beam position monitors (BPMs), SQUID/fluxgate magnetometers, and ultra-low-noise differential ADC/DAC links.

VFD inverter to AC motor screened feeder

Suitable

Two twisted 50 Ω coaxial lines inside an overall shield combine GHz bandwidth with > 100 dB magnetic loop cancellation.

Switchgear & control cabinet wiring

Suitable

Eliminates ground loops by isolating both inner coaxial shields from the outer chassis shield (differential twin-coax).

Fixed installation

Suitable

Built with 100 % non-magnetic OFHC silver-plated copper (μr < 1.0005) so tokamak, MRI, and SQUID fields are undistorted.

Motorised monospiral reel

Not suitable

Precision phase-matched twin-coax is engineered for fusion, aerospace, and lab instrumentation rather than reeling drums.

Use DH+ 9463F Industrial Twinax
Typical machinesTokamak & Stellarator Fusion DiagnosticsParticle Accelerator Beam Monitors (BPM)SQUID, Fluxgate & MRI MagnetometryNaval Minehunting & Acoustic ArraysHigh-Speed Differential ADC / DAC Test

Construction

Layer by layer

TWISTCOAX balanced twin-coax build: 2 × phase-matched 50 Ω coaxial sub-cables (SPC center + PTFE/ePTFE + individual SPC braid + FEP jacket) twisted with short lay, overall Al/PI tape + SPC braid, and outer sheath.

12345
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
12 × non-magnetic silver-plated OFHC copper conductorsTwo matched solid or 19-strand oxygen-free silver-plated copper conductors (26, 24, or 22 AWG, μr < 1.0005)Zero ferromagnetic distortion and identical DC/RF resistance across both legs
2Phase-matched PTFE or ePTFE coaxial dielectricsEach conductor concentrically insulated with virgin PTFE (70 % VoP) or microporous ePTFE (80 % VoP)Co-manufactured from the same extrusion lot for < 5 ps/m intra-pair delay skew
32 × individual coaxial shields + inner FEP jacketsEach 50 Ω sub-coax carries its own ≥ 92 % silver-plated copper braid and colour-coded thin FEP jacket, twisted togetherMaintains constant 50 Ω single-ended / 100 Ω differential impedance and cancels magnetic flux loops
4Overall silver-plated copper braid + foil screen100 % metallized polyimide/PET tape + ≥ 92 % overall silver-plated copper wire braidProvides > 105 dB triaxial isolation between chassis ground and signal reference shields
5FEP fluoropolymer, PEEK or LSZH outer jacketExtruded FEP (-65 to +200 °C), radiation-hardened PEEK/PI (tokamak vacuum), or naval LSZH jacketVacuum-compatible, radiation-resistant, and flame-retardant outer protection

TWISTCOAX-24 / -26 (100 Ω Differential · 2×50 Ω FEP)

Phase-matched twisted dual 50 Ω micro-coax with isolated inner shields and overall SPC braid (-65 to +200 °C)

TWISTCOAX-VAC / -RAD (PEEK / Polyimide)

Ultra-high-vacuum (< 10⁻⁹ mbar) and radiation-hardened balanced twin-coax for tokamak & accelerator vessels

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on IEC 61196-1 / IEEE Tokamak & Magnetometer Balanced Twin-Coaxial Spec. Values for your order are confirmed in the datasheet and quotation.

Electrical

Characteristic impedance
100 Ω ± 2 Ω differential (2 × 50 Ω ± 1 Ω single-ended)
Intra-pair propagation skew
< 5.0 ps/m (< 0.15° phase skew at 100 MHz)
Velocity of propagation
70 % (solid PTFE, 95 pF/m) · 80 % (ePTFE, 82 pF/m)
Operating bandwidth
DC to 6 GHz (24/22 AWG) · DC to 12 GHz (26 AWG ePTFE)
Shielding & CMRR
> 105 dB RF shielding · > 100 dB common-mode rejection

Thermal

Operating temperature (FEP)
-65 °C to +200 °C continuous
Cryogenic / UHV version
4 K (-269 °C) to +260 °C (PTFE/Polyimide)
Dielectric withstand voltage
1,500 V RMS (core/inner shield) · 1,000 V (shield/shield)

Mechanical

Sub-coax conductor gauges
2 × 28 AWG, 2 × 26 AWG, 2 × 24 AWG, or 2 × 22 AWG
Overall cable diameter
4.2 mm (2×28 AWG) to 6.8 mm (2×22 AWG)
Min. bending radius
6 × OD (static) · 10 × OD (dynamic)

Resistance

Magnetic permeability
μr < 1.0005 (strictly non-magnetic OFHC/SPC)
Vacuum & radiation rating
UHV compatible · up to 10 MGy (PEEK/PI version)
Flammability & fluids
FAR 25.869 / UL VW-1 & solvent/acid immune

Reference standards

EMC & coaxial standards
IEC 61196-1, IEC 62153-4-9, MIL-STD-461 RE101/RS101
Connector compatibility
Dual SMA, Dual BNC, LEMO 1B/2B Twinax/Triax, D38999
RoHS & REACH
RoHS 3 & REACH SVHC compliant

Identification

Outer jacket colour
Translucent Blue FEP, Amber PI, or Black LSZH
Surface legend
TEBAOFLEX TWISTCOAX 2x50 OHM (100 OHM BALANCED) LOW-MAGNETIC
Customs tariff (HS)
8544.20

Sizes

8 standard configurations (TWISTCOAX)

Engineering dimensions, impedance, propagation velocity, and electrical ratings for TWISTCOAX per IEC 61196-1 / IEEE Tokamak & Magnetometer Balanced Twin-Coaxial Spec.

Dimensions & weights
Order designationImpedance / sizeConductor & dielectricWall ≈
mm		Outer Ø ≈
mm		Metal
kg/km		Weight ≈
kg/km		Min. bend R
fixed mm		Enquiry
Standard TWISTCOAX configurations
TWISTCOAX-28 Sub-Mini100 Ω (2×50 Ω · 28 AWG)2×(19×40 SPC + PTFE) + Braid0.404.2022.036.025
TWISTCOAX-26 Standard100 Ω (2×50 Ω · 26 AWG)2×(19×38 SPC + PTFE) + Braid0.454.8531.051.029
TWISTCOAX-26L Low-Loss100 Ω (2×50 Ω · 26 AWG ePTFE)2×(19×38 SPC + ePTFE) + Braid0.455.1032.052.031
TWISTCOAX-24 Precision100 Ω (2×50 Ω · 24 AWG)2×(19×36 SPC + ePTFE) + Braid0.505.8044.072.035
TWISTCOAX-22 Long-Run100 Ω (2×50 Ω · 22 AWG)2×(19×34 SPC + ePTFE) + Braid0.556.8062.098.041
TWISTCOAX-150 (2×75 Ω)150 Ω (2×75 Ω · 26 AWG)2×75 Ω Twisted Coax + Braid0.505.9038.064.036
TWISTCOAX-UHV Tokamak100 Ω (2×50 Ω · Polyimide)Non-Magnetic OFHC + PI/PEEK0.354.6030.047.028
TWISTCOAX-LSZH Naval100 Ω (2×50 Ω · 24 AWG LSZH)Non-Magnetic + Low-Smoke Jacket0.706.4046.082.039
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Outer diameters and weights are nominal engineering values for TWISTCOAX subject to standard manufacturing tolerances per IEC 61196-1 / IEEE Tokamak & Magnetometer Balanced Twin-Coaxial Spec.

Quality & approvals

Testing & inspection

Routine tests on every production length, sample and type tests per batch — documented on an EN 10204 3.1 inspection certificate.

  1. ConductorClass 5 stranding
  2. Spark test100 % in-line
  3. Lay-upCores, earth, fillers
  4. SheathingInner, braid / screen, outer
  5. Electrical testsAC voltage, resistance
  6. DimensionsOD, wall thickness
  7. Inspection documents & dispatchDrum & dispatch
Testing & inspectionTest value / referenceFrequency
Routine tests
Characteristic impedance, return loss (VSWR) & TDR sweep100 % frequency-domain return loss and TDR impedance verification per IEC 61196-1 / IEEE Tokamak & Magnetometer Balanced Twin-Coaxial SpecEvery manufactured length
Dielectric spark & high-voltage withstand test100 % in-line spark and AC/DC dielectric withstand per IEC 61196-1 / IEEE Tokamak & Magnetometer Balanced Twin-Coaxial SpecEvery spool or drum length
Sample tests
Insertion loss (attenuation), velocity & capacitance checkAttenuation (dB/100m), VoP (%), and capacitance within IEC 61196-1 / IEEE Tokamak & Magnetometer Balanced Twin-Coaxial Spec limitsPer production batch
Screening attenuation, transfer impedance & environmental qualificationQualified to IEC 61196-1 / IEEE Tokamak & Magnetometer Balanced Twin-Coaxial Spec EMC shielding, thermal, and flame/fluid criteriaType qualification

Inspection certificate

Issued with every drum, listing the routine test results for that length.

Product approvals

IEC 61196-1 / IEEE Tokamak & Magnetometer Balanced Twin-Coaxial SpecCE (2014/35/EU) & RoHS 3 (2015/863/EU) CompliantREACH SVHC Compliance Verified

Company certificates

ISO 9001ISO 14001ISO 45001VDE marks approvalUL / cULCE · LVD / EMC

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX TWISTCOAX 2x50 OHM (100 OHM BALANCED) LOW-MAGNETIC PRECISION CABLE
Delivery form
Export wooden drums, flange reels or precision coils
Standard lengths
100 m · 305 m · 500 m · 1000 m (or custom cut lengths)
MOQ
100 m (stock sizes) · 300–500 m (custom build)
Lead time
2–4 weeks ex-works
Incoterms
EXW, FOB, CIF, DAP

Technical documents

Downloads

PDFTWISTCOAX Balanced Twin-Coaxial Low-Magnetic-Signature Precision – technical datasheet8 sizes · construction, technical data, approvalsXLSXTWISTCOAX spec data (Excel)All 8 sizes with dimensions and data, for your BOM or quotation
Revision
2026-10-20
Updated
2026-10-20

FAQ

Questions engineers ask first

Not covered here? Send your drawing — an engineer replies within 2 business hours.

Why use TWISTCOAX (two twisted 50 Ω coaxial cables inside an overall shield) instead of a single coaxial cable or a standard twisted pair?
A single coaxial cable suffers from low-frequency ground-loop currents on its shield and cannot cancel magnetic flux penetrating the coax loop; a standard shielded twisted pair cancels low-frequency magnetic hum but suffers impedance discontinuity and crosstalk at GHz frequencies. By twisting two phase-matched 50 Ω coaxial sub-cables inside an overall shield, TWISTCOAX achieves both < 5 ps/m microwave bandwidth and > 100 dB low-frequency magnetic dB/dt rejection.
Why must copper-clad steel (CCS) and nickel-plated connectors be avoided in tokamak, MRI, and magnetometer cables?
Steel cores and nickel underplatings are ferromagnetic (μr >> 1), distorting local static magnetic fields and generating magneto-mechanical noise under vibration. TWISTCOAX uses strictly non-magnetic oxygen-free silver-plated copper (μr < 1.0005) throughout its conductors and shields.
How are the three shields (2 inner coaxial shields + 1 outer overall shield) grounded?
The two inner 50 Ω coaxial shields provide the continuous return paths for the differential 100 Ω signal (connected to the differential SMA/BNC/triax shells), while the outer overall braid acts as an electrostatic/Faraday guard connected to the instrument chassis or vacuum vessel wall.
What is the typical phase skew between the two 50 Ω channels in TWISTCOAX?
Because both coaxial sub-elements are extruded in the same production run and twisted with symmetrical back-twist tension, propagation delay skew between the two channels is held below 5 ps/m.

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TWISTCOAX Balanced Twin-Coaxial Low-Magnetic-Signature Precision

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