HLHTY(Z)(R)-50-42D Tunnel Leaky Coaxial Cable

The tunnel leaky cable HLHTY(Z)(R)-50-42D consists of a flexible corrugated copper tube inner conductor, a low-loss physically foamed polyethylene insulation layer, a low-loss low-frequency radiation copper foil outer conductor with “8”-shaped slots, and an LSZH flame-retardant polyolefin outer jacket. When used outdoors, the outer jacket is made of UV-resistant linear low-density polyethylene. This product is designed for tunnel environments and is suitable for civil wireless broadcasting, civil intercom, metro public security and fire-fighting wireless, dedicated TETRA systems, railway wireless train dispatching, GSM-R, CDMA800, GSM900 and other systems, with excellent low-frequency electrical performance.

Construction materials

Inner conductor: Helically corrugated copper tube
Insulation: Physically foamed polyethylene
Outer conductor: Slotted copper tape
Jacket: Linear low-density polyethylene / LSZH flame-retardant polyolefin（two options available）
Jacket color: Black

Construction dimensions

Inner conductor diameter: 18.00 mm
Insulation outer diameter: 42.80 mm
Outer conductor outer diameter: 43.50 mm
Jacket outer diameter: 47.60 mm

Mechanical and physical properties

One-time bending radius: 500 mm
Repeated bending radius: 700 mm
Minimum number of bends: 15
Tensile strength: 3000 N
Bending moment: 16.0 N·m
Recommended clamp spacing: 0.8～1.2 m
Minimum distance to wall: 50 mm

Environmental performance

Storage temperature: -55℃～+85℃
Installation temperature: -40℃～+80℃
Operating temperature: -55℃～+85℃
Relative humidity: 95%
RoHS：Compliant

Electrical Performance（Basic Parameters）
Parameter	Value	Parameter	Value
Capacitance	75.0 pF/m	Characteristic impedance	50±2 Ω
Insulation resistance	≥10000 MΩ·km	Jacket spark voltage	10000 V
Velocity of propagation	89%	Insulation test voltage	15 kV
Inner conductor DC resistance	1.50 Ω/km	Outer conductor DC resistance	1.60 Ω/km
Usable frequency band	5~1000 MHz	Optimum frequency band	350~960 MHz
Prohibited frequency band	500~530 MHz、750~800 MHz

Electrical Performance - Voltage Standing Wave Ratio（VSWR）
Frequency band range	Max. VSWR
75~150 MHz	≤1.3
350~470 MHz	≤1.3
800~900 MHz	≤1.3

Electrical Performance - Attenuation and Coupling Loss（20℃）
Frequency（MHz）	Attenuation（dB/100m）	Coupling loss（95%，2m，dB）
75	0.6	72
100	0.7	74
150	0.9	76
350	1.4	72
450	1.6	70
800	2.4	63
900	2.7	62

Note: Attenuation values are typical, with a maximum deviation not exceeding 5%; coupling loss tolerance is ±5 dB.

Polarization

5~150 MHz：Cross polarization
300~960 MHz：Horizontal polarization

Test standards

Flame retardancy: IEC 60332-1
Smoke index: IEC 61034
Toxicity index: IEC 60754-1、IEC 60754-2
Attenuation and coupling loss: IEC 61196-4

Certifications

ISO 9001:2015：Compliant
RoHS 2011/65/EU：Compliant

Delivery standards

Custom production in specified lengths or cutting of existing products is supported（please specify the exact requirements in the order）.
The jacket material（linear low-density polyethylene / LSZH flame-retardant polyolefin）must be clearly specified in the order.
For special protection, length or construction customization requirements, please contact our customer service to confirm.

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