HCA618-50J
6 1/8" HELIFLEX^® Air-Dielectric Coaxial Cable

Name: 6 1/8" HELIFLEX ® Air-Dielectric Coaxial Cable
SKU: HCA618-50J

Rev : E | Rev date : 15 Nov 2025

HELIFLEX® 6-1/8" low loss air dielectric cable

Feature / 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

Air-Dielectric, Corrugated

Size

6-1/8

Jacket Option

Black

Inner Conductor Diameter

67mm (2.63in)

Inner Conductor Material

Corrugated Copper Tube

Dielectric Diameter

147mm (5.78in)

Dielectric Material

Helical Polyethylene Spacer

Outer Conductor Diameter

162mm (6.37in)

Outer Conductor Material

Corrugated Copper

Jacket Diameter

169mm (6.65in)

Jacket Material

Polyethylene, PE

Testing and Environmental

Fire Performance

Halogene Free

Flame Retardant Jacket Specifications

Meets the requirements according to: IEC60754-1, IEC60754-2

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)

Electrical Specifications

Impedance

50 +/- 0.5 Ω

Maximum Frequency

0.86 GHz

Velocity

97 %

Capacitance

69pF/m (21pF/ft)

Inductance

0.173µH/m (0.053µH/ft)

Peak Power Rating

2890 kW

RF Peak Voltage

17000 Volts

Jacket Spark

8000 Volt RMS

Inner Conductor dc Resistance

0.17ohm/1000 m (0.052ohm/1000 ft)

Outer Conductor dc Resistance

0.044ohm/1000 m (0.013ohm/1000 ft)

Return Loss (VSWR) Performance

Standard

Phase Stabilized

Phase matched cables and assemblies are available upon request.

Mechanical Specifications

Cable Weight

10kg/m (6.7lb/ft)

Minimum Bending Radius

1000mm (39in)

Minimum Bending Radius

1500mm (59in)

Bending Moment

1000 (738)

Tensile Strength

6000N (1349lb)

Recommended / Maximum Clamp Spacing

1 / 2 (3.3 / 6.6)

Attenuation @ 20°C (68°F) and Power Rating @ 40°C (104°F)

Frequency, MHz	dB per 100m	dB per 100ft	Power, kW
0.5	0.013	0.004	2500
1	0.018	0.006	1770
1.5	0.022	0.007	1440
2	0.026	0.008	1250
10	0.058	0.018	554
20	0.082	0.025	390
30	0.101	0.031	318
50	0.132	0.04	243
88	0.176	0.054	183
100	0.189	0.058	171
108	0.196	0.06	165
150	0.233	0.071	139
174	0.252	0.077	129
200	0.272	0.083	120
300	0.338	0.103	97
400	0.395	0.12	83.6
450	0.421	0.128	78.8
500	0.446	0.136	74.7
512	0.452	0.138	73.7
600	0.493	0.15	68.1
700	0.537	0.164	63
800	0.579	0.176	58.9
824	0.588	0.179	58.1
860	0.602	0.184	56.9