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Product

industrial data rf cable seriesIEC 61196-4 · Leaky Feeder50 Ω · 75–2700 MHz BroadbandCPR B2ca LSZH · RCF12 & RCF78

RADIAFLEX RCF12-50 / RCF78 Radiating Leaky Feeder Cable50 Ω 1/2-inch & 7/8-inch slotted-copper broadband radiating leaky feeder (75–2700 MHz)

50 Ω broadband slotted-copper radiating ('leaky feeder') RF coaxial cable (RCF12-50 / RCF78-50 / RLKU158-50) per IEC 61196-4 with a copper tube core, foam PE dielectric (88 % VoP), milled slotted copper outer tube, and EN 45545-2 HL3 LSZH jacket.

Approved
Flame-retardant
Low-EMC design
Water-resistant
Order designation
RADIAFLEX RCF78-50JFN
Outer Ø ≈
28.50 mm
Wall thickness
1.60 mm
Total weight ≈
520.0 kg/km
Min. bend R (fixed)
350 mm
All sizes (8)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Impedance
50 Ω ± 2 Ω
IEC 61196-4 radiating cable
Frequency band
75–2700 MHz
TETRA, GSM-R, LTE & 5G NR
Velocity (VoP)
88 % – 89 %
Low-loss closed-cell foam PE
Coupling loss
55 to 68 dB
95% probability @ 2 m (IEC 61196)
Outer sheath
LSZH B2ca/Cca
Halogen-free tunnel fire safety
Sizes
1/2" & 7/8"
RCF12 (15.8 mm) · RCF78 (28.5 mm)

Typical values for this cable type, based on IEC 61196-4 / EN 50575 B2ca (Slotted-Outer-Conductor Radiating Leaky Feeder) — confirmed in the datasheet and quotation for your order.

Application fit

Is RADIAFLEX RCF12-50 / RCF78 right for your machine?

Deploy RADIAFLEX RCF12-50 and RCF78-50 as continuous distributed linear antennas inside high-speed rail tunnels, metro subways, highway tunnels, and underground mines.

TBM gantry & advancing tunnel reel

Suitable

Periodic milled slots in the copper outer conductor radiate uniform RF coverage along curved rail, metro, and road tunnels.

Mine roadway & tunnel wall hangers

Suitable

Carries VHF/UHF mine radio, TETRA/P25, GSM-R/FRMCS train control, and 4G/5G cellular on a single broadband cable.

Fixed installation

Suitable

Low-smoke zero-halogen (LSZH) jacket certified to EN 50575 CPR B2ca-s1a,d0,a1 and IEC 60332-3-24 protects passenger evacuation routes.

Motorised monospiral reel

Not suitable

Radiating leaky feeder cables are suspended on fixed tunnel wall standoffs (80–150 mm clearance), not wound on dynamic reeling drums.

Use LMR-400 Flexible Coax
Typical machinesHigh-Speed Rail & GSM-R / FRMCS TunnelsMetro Subway & Underground StationsHighway & Alpine Road TunnelsUnderground Hard-Rock & Coal MinesAirport Baggage & Utility Tunnels

Construction

Layer by layer

IEC 61196-4 leaky feeder: smooth copper/CCA inner conductor, 88–89 % VoP closed-cell foam PE core, longitudinal copper outer tape with precision-milled radiating slots, and LSZH jacket.

1234
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Copper-clad aluminum or copper tube inner conductorSmooth CCA rod (Ø 4.8 mm on RCF12-50) or hollow copper tube (Ø 9.3 mm on RCF78-50)Low longitudinal RF attenuation over 500 m – 1,500 m tunnel repeater spans
2High-expansion closed-cell foam PE dielectricNitrogen-injected closed-cell polyethylene foam (88 % VoP on RCF12; 89 % VoP on RCF78)Moisture-resistant cell structure and high phase velocity for broadband slot tuning
3Slotted copper outer conductor (coupled mode)Overlapping copper foil/corrugated tube with CNC-milled periodic radiating slot arraysControls coupling loss (55–68 dB at 2 m) across 75 MHz to 2,700 MHz
4Low-smoke zero-halogen (LSZH / FRNC) tunnel jacketHalogen-free flame-retardant polyolefin (CPR B2ca-s1a,d0,a1 or Cca, black with alignment stripe)Printed stripe aligns the radiating slot aperture toward the train/roadway clearance gauge

RCF12-50JFN / RCF12-50B (1/2-Inch · Ø 15.8 mm)

Compact 1/2" leaky feeder for metro station concourses, mine drifts, and elevator shafts

RCF78-50JFN / RCF78-50B (7/8-Inch · Ø 28.5 mm)

Low-attenuation 7/8" leaky feeder for long railway and road tunnels up to 2.7 GHz

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on IEC 61196-4 / EN 50575 B2ca (Slotted-Outer-Conductor Radiating Leaky Feeder). Values for your order are confirmed in the datasheet and quotation.

Electrical

Characteristic impedance
50 Ω ± 2 Ω
Operating frequency band
75 MHz to 2,700 MHz (VHF/TETRA/GSM-R/LTE/5G)
Velocity of propagation
88 % (RCF12, 76 pF/m) · 89 % (RCF78, 75 pF/m)
Longitudinal loss @ 450 / 900 MHz
5.3 / 7.8 dB/100m (RCF12) · 2.7 / 4.1 dB/100m (RCF78)
Longitudinal loss @ 1800 / 2400 MHz
11.8 / 14.5 dB/100m (RCF12) · 6.5 / 8.2 dB/100m (RCF78)
Coupling loss (50% / 95% @ 900 MHz)
56 dB / 65 dB at 2.0 m distance (IEC 61196-4)

Thermal

Operating temperature range
-40 °C to +85 °C
Installation temperature
-25 °C to +60 °C (LSZH tunnel jacket)
Passive intermodulation (PIM3)
≤ -155 dBc (2 × 43 dBm carriers)

Mechanical

Inner / dielectric diameter
4.8 / 12.3 mm (RCF12) · 9.3 / 23.8 mm (RCF78)
Overall jacket diameter
15.8 mm (1/2" RCF12) · 28.5 mm (7/8" RCF78)
Min. bending radius
200 mm (RCF12) · 350 mm (RCF78)
Recommended clamp spacing
1.0 m – 1.5 m on non-metallic standoffs (≥ 80 mm)

Resistance

Tunnel fire & CPR rating
EN 50575 B2ca-s1a,d0,a1 & IEC 60332-3-24 Cat C
Smoke density & halogen-free
IEC 61034-2 (≥ 70 % transmittance) & IEC 60754-1/2
Tunnel wind-load endurance
Withstands 350 km/h high-speed train piston pressure

Reference standards

Product & test standard
IEC 61196-4 (Radiating Coaxial Cables)
Railway fire compliance
EN 45545-2 / NFPA 130 / EN 50575 tunnel compliant
RoHS & REACH
RoHS 3 & REACH SVHC compliant

Identification

Outer sheath colour
Black LSZH with longitudinal slot-orientation stripe
Surface legend
TEBAOFLEX RADIAFLEX RCF12-50 / RCF78 50 OHM RADIATING CABLE LSZH
Customs tariff (HS)
8544.20

Sizes

8 standard configurations (RADIAFLEX RCF12-50 / RCF78)

Engineering dimensions, impedance, propagation velocity, and electrical ratings for RADIAFLEX RCF12-50 / RCF78 per IEC 61196-4 / EN 50575 B2ca (Slotted-Outer-Conductor Radiating Leaky Feeder).

Dimensions & weights
Order designationImpedance / sizeConductor & dielectricWall ≈
mm		Outer Ø ≈
mm		Metal
kg/km		Weight ≈
kg/km		Min. bend R
fixed mm		Enquiry
Standard RADIAFLEX RCF12-50 / RCF78 configurations
RADIAFLEX RCF12-50JFN1/2" · 50 Ω LSZHCCA Ø 4.8 + Slotted Cu1.2515.80102.0215.0200
RADIAFLEX RCF12-50B21/2" · 50 Ω CPR B2caCCA Ø 4.8 + Slotted Cu1.3016.00102.0230.0200
RADIAFLEX RCF58-50JFN5/8" · 50 Ω LSZHCu Ø 6.4 + Slotted Cu1.4020.50168.0335.0260
RADIAFLEX RCF78-50JFN7/8" · 50 Ω LSZHCu Tube Ø 9.3 + Slotted Cu1.6028.50255.0520.0350
RADIAFLEX RCF78-50B27/8" · 50 Ω CPR B2caCu Tube Ø 9.3 + Slotted Cu1.6528.80255.0550.0350
RADIAFLEX RCF114-50JFN1-1/4" · 50 Ω LSZHCu Tube Ø 13.1 + Slotted Cu1.8039.50410.0840.0500
RADIAFLEX RCF158-50JFN1-5/8" · 50 Ω LSZHCu Tube Ø 17.6 + Slotted Cu2.0050.40595.01,210.0650
RLKU12-50 Mine VHF/UHF1/2" · 50 Ω Mine PECCA Ø 4.8 + Braided/Slotted1.2515.6098.0195.0180
  • 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 RADIAFLEX RCF12-50 / RCF78 subject to standard manufacturing tolerances per IEC 61196-4 / EN 50575 B2ca (Slotted-Outer-Conductor Radiating Leaky Feeder).

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 61196-4 / EN 50575 B2ca (Slotted-Outer-Conductor Radiating Leaky Feeder)Every manufactured length
Dielectric spark & high-voltage withstand test100 % in-line spark and AC/DC dielectric withstand per IEC 61196-4 / EN 50575 B2ca (Slotted-Outer-Conductor Radiating Leaky Feeder)Every spool or drum length
Sample tests
Insertion loss (attenuation), velocity & capacitance checkAttenuation (dB/100m), VoP (%), and capacitance within IEC 61196-4 / EN 50575 B2ca (Slotted-Outer-Conductor Radiating Leaky Feeder) limitsPer production batch
Screening attenuation, transfer impedance & environmental qualificationQualified to IEC 61196-4 / EN 50575 B2ca (Slotted-Outer-Conductor Radiating Leaky Feeder) 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 61196-4 / EN 50575 B2ca (Slotted-Outer-Conductor Radiating Leaky Feeder)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 RADIAFLEX RCF78-50JFN 7/8" 50 OHM RADIATING CABLE IEC 61196-4 B2ca
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

PDFRADIAFLEX RCF12-50 / RCF78 Radiating Leaky Feeder Cable – technical datasheet8 sizes · construction, technical data, approvalsXLSXRADIAFLEX RCF12-50 / RCF78 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 does a radiating leaky feeder cable (RADIAFLEX) work in a tunnel?
Instead of a completely sealed outer shield, RADIAFLEX features CNC-milled periodic slot groups along its copper outer conductor. A controlled fraction of the RF energy travelling inside the coaxial core couples out through the slots along the entire tunnel length (and mobile uplink signals couple back in), creating a continuous linear antenna without blind spots around tunnel curves or train roofs.
What is 'coupling loss' and 'longitudinal loss' in IEC 61196-4?
Longitudinal attenuation (dB/100m) is the RF power lost per 100 m along the cable core, while coupling loss (dB, quoted at 50 % and 95 % reception probability at 2 m distance) is the path loss between the cable core and a dipole antenna 2 m away from the cable wall. Total link budget at distance L equals (Longitudinal Loss × L) + Coupling Loss.
When should I select 7/8-inch RCF78-50 versus 1/2-inch RCF12-50?
Select 7/8-inch RCF78-50 (or 1-1/4" / 1-5/8") for main railway, metro, and highway tunnel bores where low longitudinal attenuation (4.1 dB/100m @ 900 MHz) maximizes repeater spacing; select 1/2-inch RCF12-50 for station platforms, cross-passages, mine drifts, and building stairwells.
Why is the longitudinal print stripe important during tunnel installation?
The radiating slots are milled along one side of the outer copper conductor beneath the alignment stripe; installers orient the stripe facing away from the concrete tunnel wall toward the train or roadway clearance envelope to prevent wall reflection loss.

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RADIAFLEX RCF12-50 / RCF78 Radiating Leaky Feeder Cable

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