Lifetime Connectivity

HCA78-50JFN
7/8" HELIFLEX® Air-Dielectric Coaxial Cable, flame retardant/ halogen free jacket

Rev : B | Rev date : 15 Nov 2025

HELIFLEX® 7/8" 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.
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Applications
Applications Wireless Communication TV & Radio HF Defense Mobile Radio Cable Solutions
Structure
Cable Type Air-Dielectric, Corrugated
Size 7/8
Jacket Option Black
Inner Conductor Diameter 9mm (0.35in)
Inner Conductor Material Copper Tube
Dielectric Diameter 20.2mm (0.79in)
Dielectric Material Helical Polyethylene Spacer
Outer Conductor Diameter 25.5mm (1in)
Outer Conductor Material Corrugated Copper
Jacket Diameter 28mm (1.103in)
Jacket Material Polyethylene, PE, Metalhydroxite Filling
Testing and Environmental
Fire Performance Flame Retardant, LS0H
Flame Retardant Jacket Specifications The jacketing meets the testing requirements of Underwriters Laboratories UL 1666, and qualifies for the NEC CATVR type rating code (NEC Section 820-51(b) Type CATVR- NEC 1996)as well as IEC 60332-1
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 3 GHz
Velocity 93 %
Capacitance 71pF/m (21.6pF/ft)
Inductance 0.178µH/m (0.054µH/ft)
Peak Power Rating 73 kW
RF Peak Voltage 2700 Volts
Jacket Spark 8000 Volt RMS
Inner Conductor dc Resistance 1.1ohm/1000 m (0.34ohm/1000 ft)
Outer Conductor dc Resistance 0.88ohm/1000 m (0.27ohm/1000 ft)
Return Loss (VSWR) Performance Standard
Phase Stabilized

Phase stabilized and phase matched cables and assemblies are available upon request.

Mechanical Specifications
Cable Weight 0.68kg/m (0.46lb/ft)
Minimum Bending Radius 100mm (4in)
Minimum Bending Radius 250mm (10in)
Bending Moment 27 (20)
Tensile Strength 1600N (360lb)
Recommended / Maximum Clamp Spacing 0.5 / 0.9 (1.8 / 3)
Attenuation @ 20°C (68°F) and Power Rating @ 40°C (104°F)
Frequency, MHz dB per 100m dB per 100ft Power, kW
0.5 0.081 0.025 73
1 0.115 0.035 73
1.5 0.141 0.043 70.9
2 0.163 0.05 61.4
10 0.366 0.112 27.3
20 0.52 0.158 19.2
30 0.638 0.194 15.7
50 0.827 0.252 12.1
88 1.1 0.337 9.11
100 1.18 0.359 8.49
108 1.23 0.374 8.15
150 1.45 0.443 6.92
174 1.57 0.478 6.39
200 1.69 0.514 5.94
300 2.08 0.634 4.84
400 2.42 0.738 4.17
450 2.57 0.785 3.93
500 2.72 0.83 3.71
512 2.76 0.84 3.66
600 3 0.914 3.37
700 3.25 0.992 3.12
800 3.49 1.07 2.91
824 3.55 1.08 2.86
894 3.71 1.13 2.74
900 3.72 1.13 2.74
925 3.78 1.15 2.69
960 3.85 1.17 2.65
1000 3.94 1.2 2.59
1250 4.45 1.36 2.3
1500 4.91 1.5 2.1
1700 5.26 1.6 1.97
1800 5.43 1.65 1.91
2000 5.75 1.75 1.81
2200 6.07 1.85 1.72
2300 6.22 1.9 1.68
3000 7.22 2.2 1.47

External Document Links

Notes

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