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Product

industrial data rf cable series4 × 28 AWG (19×40) Ag-Cu-AlloyØ 2.92 mm (.115") Sub-Miniature> 25 dB Magnetic Hum Cancel

Miniature Star-Quad Double-Shielded Low-Noise Microphone & Bio-Signal CableØ 2.92 mm (.115") 4×28 AWG silver-plated copper-alloy miniature Star-Quad low-noise cable

Sub-miniature Ø 2.92 mm double-shielded Star-Quad low-noise microphone and bio-signal cable (1804A) with 4×28 AWG (19×40) silver-plated copper-alloy cores, polypropylene insulation, and dual ≥ 90 % SPC braids (> 95 dB shielding) under a PVC jacket.

Low-EMC design
EMC screen
Flame-retardant
Oil-resistant
Order designation
1804A Sub-Mini Star-Quad
Outer Ø ≈
2.92 mm
Wall thickness
0.42 mm
Total weight ≈
14.9 kg/km
Min. bend R (fixed)
29 mm
All sizes (8)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Outer diameter
2.92 mm (.115")
Ultra-thin miniature Star-Quad
Conductors
4 × 28 AWG
19×40 AWG Ag-plated Cu-alloy
Impedance
42 Ω (Quad)
157.5 pF/m (48 pF/ft) quad mode
Hum rejection
> 25 dB vs 2-C
Diagonal Star-Quad cancellation
Shielding
95 % French/Sp
Double-spiral / French-braid Cu
Temperature
-30…+75 °C
300 V RMS · 29 mm bend radius

Typical values for this cable type, based on UL AWM Style 2094 / IEC 60268-11 (Sub-Miniature 4×28 AWG Star-Quad) — confirmed in the datasheet and quotation for your order.

Application fit

Is Star-Quad Low-Noise Mic right for your machine?

Specify Star-Quad 1804A for miniature lavalier/podium/boom microphones, EMG/EEG/ECG neurophysiology leads, micro-strain-gauge bridges, and low-level millivolt/microvolt transducers.

Switchgear & control cabinet wiring

Suitable

Sub-miniature Ø 2.92 mm OD and 19×40 AWG Cu-alloy strands fit TA3F/TA4F mini-XLR, LEMO 00/0B, and micro-medical plugs.

VFD inverter to AC motor screened feeder

Suitable

Diagonal Star-Quad pairing places both signal legs on the same magnetic center, cancelling 50/60 Hz magnetic hum by > 25 dB.

Self-supporting pendant & push-button drop

Suitable

French-braid (double-spiral) 95 % tinned copper shield + 30 AWG drain wire stays limp and non-kinking under wearable and boom-pole flexing.

Motorised monospiral reel

Not suitable

Sub-miniature 28 AWG cable is designed for studio, wearable bio-signal, and sensor harnesses—not heavy outdoor reeling drums.

Use TWISTCOAX Balanced Coax
Typical machinesBroadcast, Film & Theatre Lavalier MicsEMG / EEG / ECG Neurophysiology SystemsAerospace & Wind-Tunnel Strain GaugesPrecision Load Cells & Bridge SensorsAcoustic Array & Hydrophone Pre-Amps

Construction

Layer by layer

1804A miniature Star-Quad build: 4 × 28 AWG (19×40 AWG) silver-plated copper-alloy cores (black, white, red, green) twisted around a central filler, 95 % French-braid/double-spiral Sn-Cu shield + drain wire, and Ø 2.92 mm matte jacket.

12345
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
128 AWG silver-plated high-strength copper-alloy4 × 28 AWG (19×40 AWG, 0.09 mm²) ASTM B624 silver-coated high-strength copper-alloy conductorsWithstands > 130 N cable pull tension despite sub-miniature 28 AWG cross-section
2Thin-wall CADP / Polypropylene Star-Quad coresLow-permittivity conductive-acrylic-dispersion-polymer / PP insulation (Black, White, Red, Green, Ø 0.69 mm)Tight concentric wall tolerance ensures < 1 % geometric unbalance across diagonal pairs
3Central yarn spline & low-friction tissue wrapMicro-denier central tensile filler + non-hygroscopic separator wrapPreserves exact 4-core diamond symmetry and minimizes triboelectric handling noise
495 % French-braid / double-spiral tinned copper shield42 AWG tinned copper French braid / counter-wrapped double spiral shield (95 % coverage) + 30 AWG drain wireCombines braid coverage with spiral flexibility and fast drain-wire soldering
5Matte flexible PVC or bio-compatible PUR jacketNon-reflective matte grey/black PVC (Ø 2.92 mm) or USP Class VI / ISO 10993 medical PURSupple, non-glare drape for on-camera talent and patient electrode leads

1804A Standard (Ø 2.92 mm · Matte Grey/Black PVC)

4×28 AWG (19×40) silver-plated copper-alloy Star-Quad for miniature microphones and sensors

1804A-PUR (Bio-Signal Medical / Drag-Flex)

Halogen-free alcohol-resistant PUR jacket for EMG/EEG patient leads and wearable telemetry

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on UL AWM Style 2094 / IEC 60268-11 (Sub-Miniature 4×28 AWG Star-Quad). Values for your order are confirmed in the datasheet and quotation.

Electrical

Characteristic impedance
42 Ω (Star-Quad paired) · 76 Ω (single pair)
Quad capacitance (Hi to Lo)
157.5 pF/m (48.0 pF/ft) with diagonal cores tied
Conductor-to-shield cap.
295.3 pF/m (90.0 pF/ft) quad-to-shield
Conductor DC resistance @ 20 °C
223 Ω/km single core · 111.5 Ω/km diagonal quad pair
Shield DC resistance @ 20 °C
44.0 Ω/km (95 % Sn-Cu shield + 30 AWG drain)
Velocity of propagation
66 % nominal (inductance 0.49 µH/m)

Thermal

Operating temperature range
-30 °C to +75 °C (PVC) · -40 to +80 °C (PUR)
Max. operating voltage
300 V RMS (100 mA max current per core at +25 °C)
Dielectric withstand voltage
1,000 V AC rms

Mechanical

Conductor stranding
4 × 28 AWG (19×40 AWG, 0.09 mm²) Ag-Cu-alloy
Overall cable diameter
2.92 mm (0.115 in) · Weight 14.9 kg/km
Min. bending radius
29 mm (1.15 in) installation · 15 mm static loop
Max. pulling tension
131 N (29.5 lbf)

Resistance

Magnetic hum rejection
> 25 dB improvement over standard 2-conductor shielded
Handling & triboelectric noise
Low-noise separator & tight quad lay reduce microphonics
Disinfectant resistance (PUR)
Resists IPA alcohol & quaternary ammonium wipes

Reference standards

Conductor alloy standard
ASTM B624 High-Strength Silver-Coated Copper Alloy
Audio / instrumentation ref.
IEC 60268-11 Star-Quad Balanced Interconnect
RoHS & REACH
RoHS 3 & REACH SVHC compliant

Identification

Core colour code
Black + Red (Phase+) · White + Green (Phase-)
Outer jacket colour
Matte Grey (RAL 7037) or Matte Black
Customs tariff (HS)
8544.49

Sizes

8 standard configurations (Star-Quad 1804A)

Engineering dimensions, impedance, propagation velocity, and electrical ratings for Star-Quad 1804A per UL AWM Style 2094 / IEC 60268-11 (Sub-Miniature 4×28 AWG Star-Quad).

Dimensions & weights
Order designationImpedance / sizeConductor & dielectricWall ≈
mm		Outer Ø ≈
mm		Metal
kg/km		Weight ≈
kg/km		Min. bend R
fixed mm		Enquiry
Standard Star-Quad 1804A configurations
1804A Sub-Mini Star-Quad4×28 AWG (Ø 2.92 mm)19×40 SPC Alloy + 95% Braid0.422.926.814.929
1804A-PUR Bio-Signal4×28 AWG (Ø 2.95 mm)19×40 SPC Alloy + PUR0.432.956.814.525
1804A-DS Double-Shield4×28 AWG (Ø 3.25 mm)19×40 SPC + 2×Spiral Shield0.453.259.518.528
Star-Quad Nano 4×30 AWG4×30 AWG (Ø 2.35 mm)19×42 SPC Alloy + Spiral0.352.354.59.820
Star-Quad Mini 4×26 AWG4×26 AWG (Ø 3.80 mm)19×38 Tinned Cu + 95% Braid0.553.8011.224.035
1192A-M Compact 4×24 AWG4×24 AWG (Ø 4.85 mm)42×40 Bare Cu + 95% Braid0.704.8518.538.045
1192A Standard 4×24 AWG4×24 AWG (Ø 6.15 mm)42×40 Bare Cu + PE + PVC0.956.1523.055.055
1804A-FEP Cryo/Vacuum4×28 AWG (Ø 2.75 mm)19×40 SPC Alloy + FEP0.352.756.815.228
  • 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 Star-Quad 1804A subject to standard manufacturing tolerances per UL AWM Style 2094 / IEC 60268-11 (Sub-Miniature 4×28 AWG Star-Quad).

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 UL AWM Style 2094 / IEC 60268-11 (Sub-Miniature 4×28 AWG Star-Quad)Every manufactured length
Dielectric spark & high-voltage withstand test100 % in-line spark and AC/DC dielectric withstand per UL AWM Style 2094 / IEC 60268-11 (Sub-Miniature 4×28 AWG Star-Quad)Every spool or drum length
Sample tests
Insertion loss (attenuation), velocity & capacitance checkAttenuation (dB/100m), VoP (%), and capacitance within UL AWM Style 2094 / IEC 60268-11 (Sub-Miniature 4×28 AWG Star-Quad) limitsPer production batch
Screening attenuation, transfer impedance & environmental qualificationQualified to UL AWM Style 2094 / IEC 60268-11 (Sub-Miniature 4×28 AWG Star-Quad) EMC shielding, thermal, and flame/fluid criteriaType qualification

Inspection certificate

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

Product approvals

UL AWM Style 2094 / IEC 60268-11 (Sub-Miniature 4×28 AWG Star-Quad)CE (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 1804A 4C28 MINIATURE STAR-QUAD LOW-NOISE SHIELDED 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

PDFMiniature Star-Quad Double-Shielded Low-Noise Microphone & Bio-Signal Cable – technical datasheet8 sizes · construction, technical data, approvalsXLSXStar-Quad Low-Noise Mic 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.

How should the four conductors of Star-Quad 1804A be wired for maximum magnetic hum cancellation?
In a balanced 2-signal circuit (such as an XLR microphone or differential bio-amplifier), tie the two diagonally opposite conductors together at both ends: connect Black + Red to Signal High (Pin 2 / Non-Inverting) and White + Green to Signal Low (Pin 3 / Inverting), with the shield + drain wire on Pin 1. Because both pairs share the exact geometric center of the quad, external 50/60 Hz magnetic fields induce equal voltages in both legs that cancel by > 25 dB.
Can 1804A also be wired as 4 independent conductors (e.g., for a 4-wire Wheatstone strain-gauge bridge)?
Yes. When used for 4-wire full-bridge strain gauges, load cells, or 4-channel EEG/EMG active electrodes, each of the four 28 AWG conductors (Black, White, Red, Green) can carry an independent excitation or sense line inside the 95 % shield.
Why does 1804A use 19×40 AWG silver-plated high-strength copper alloy instead of standard annealed copper?
A 2.92 mm miniature cable worn by stage performers, patients, or test rigs experiences frequent tugs and tight bends; high-strength silver-plated copper alloy delivers 131 N (29.5 lbf) pull strength and millions of flex cycles without conductor breakage.
What is a 'French braid' (double-spiral) shield?
A French braid interweaves two opposing spiral wire serves so the cable bends as effortlessly and limply as a spiral-shielded microphone cord while resisting shield windowing like a conventional woven braid.

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Miniature Star-Quad 4×28 AWG Miniature Star-Quad Double-Shielded Low-Noise Microphone & Bio-Signal Cable

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