Home
HCA400-50J

HCA400-50J
4" HELIFLEX^® Air-Dielectric Coaxial Cable

Name: 4" HELIFLEX ® Air-Dielectric Coaxial Cable
SKU: HCA400-50J

Rev : G | Rev date : 15 Jan 2026

HELIFLEX® 4" low loss air dielectric cable

Features / Benefits

Low Attenuation
The low attenuation of HELIFLEX® coaxial cable results in highly efficient signal transfer in your RF system.
Complete Shielding
The solid outer conductor of HELIFLEX® coaxial cable creates a continuous RFI/EMI shield that minimizes system interference.
Low VSWR
Special low VSWR versions of HELIFLEX® coaxial cables contribute to low system noise.
Outstanding Intermodulation Performance
HELIFLEX® coaxial cable's solid inner and outer conductors virtually eliminate intermods. Intermodulation performance is also confirmed with state-of-the-art equipment at the RFS factory.
High Power Rating
Due to their low attenuation, outstanding heat transfer properties and temperature stabilized dielectric
materials, HELIFLEX® cable provides safe long term operating life at high transmit power levels.
Wide Range of Application
Typical areas of application are: feedlines for broadcast and terrestrial microwave antennas, wireless cellular, PCS and ESMR base stations, cabling of antenna arrays, and radio equipment interconnects.

Applications

TV & Radio

HF Defense

Cable Solutions

Structure

Cable Type

HCA

Size

Jacket Option

Outdoor

Inner Conductor Material

Corrugated Copper Tube

Dielectric Material

Helical Polyethylene Spacer

Outer Conductor Material

Corrugated Copper

Jacket Material

Black Polyethylene

Mechanical Specifications

Inner Conductor Diameter

34.8mm (1.37in)

Dielectric Diameter

75.3mm (2.96in)

Outer Conductor Diameter

85.5mm (3.36in)

Jacket Diameter

90.5mm (3.56in)

Cable Weight

3.1kg/m (2.1lb/ft)

Min Bending Radius, Single Bend

380mm (15in)

Min. Bending Radius, Repeated Bends

890mm (35in)

Bending Moment

215 Nm (159 lbf*ft)

Tensile Strength

1,800N (405lb)

Air Volume

5l/m (0.0538ft³/ft)

Recommended / Maximum Clamp Spacing

0.8 / 1.2 m (2.75 / 4 ) ft

Electrical Specifications

Impedance

50 +/- 0.5 Ω

Max. Operating Frequency

1.66 GHz

Velocity

96 %

Capacitance

70pF/m (21.3pF/ft)

Inductance

0.175µH/m (0.053µH/ft)

Peak Power Rating

940 kW

RF Peak Voltage

9,700 V

Jacket Spark

8,000 V RMS

DC-Resistance Inner Conductor

0.43Ω/km (0.13Ω/kft)

DC-Resistance Outer Conductor

0.13Ω/km (0.04Ω/kft)

Return Loss (VSWR) Performance

Standard

Min. Return Loss (Max. VSWR)

Typical 20.8dBdB (1.2 VSWR or better within the operation bands of most global frequency ranges. Premium also available. Contact factory for options in your specific frequency band.VSWR)

Testing and Environmental

Fire Performance

Halogene Free

Compliance

RoHS 2011/65/EU
China RoHS SJ/T 11364-2006
IEC 60754-1/-2 Halogen Acid Gases
REACH (EC 1907/2006)
IEC 60754-1/-2 Halogen Acid Gases

Phase Stabilized

Phase matched cables and assemblies are available upon request.

Installation Temperature

-40°C to 60°C (-40°F to 140°F)

Storage Temperature

-70°C to 85°C (-94°F to 185°F)

Operation Temperature

-50°C to 85°C (-58°F to 185°F)

Attenuation and Power Rating

Frequency, MHz	dB per 100m	dB per 100ft	Power, kW
0.5	0.025	0.008	792
1	0.035	0.011	561
1.5	0.043	0.013	457
2	0.049	0.015	395
10	0.111	0.034	175
20	0.158	0.048	123
30	0.194	0.059	100
50	0.252	0.077	77.4
88	0.338	0.103	57.9
100	0.362	0.11	54.1
108	0.377	0.115	52
150	0.448	0.136	44
174	0.484	0.148	40.8
200	0.521	0.159	38
300	0.648	0.198	30.9
400	0.757	0.231	26.7
450	0.808	0.246	25.1
500	0.856	0.261	23.8
512	0.867	0.264	23.6
600	0.946	0.288	21.8
700	1.03	0.314	20.2
800	1.11	0.339	18.9
824	1.13	0.344	18.6
894	1.18	0.36	18
900	1.19	0.362	17.8
925	1.21	0.367	17.6
960	1.23	0.375	17.3
1000	1.26	0.384	17

Note	Standard Conditions: For attenuation: VSWR 1.0, cable temperature 20°C (68°F). For average power: VSWR 1.0, ambient temperature 40°C (104°F), inner conductor temperature 115°C (239°F). No solar loading.