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HCA78-50
7/8" Air-Dielectric Coaxial Cable, 50 ohm, Low Loss and High Power Rating, Unjacketed

Rev : P2 | Rev date : 11 Sep 2024

RFS Technologies' air dielectric cables are air filled coaxial cables which consist of an inner conductor and an outer conductor. A dielectric helix is used to center the inner conductor to the outer conductor. Air dielectric cables have low attenuation and high power rating which make them perfect choice of high RF power transmission lines, such as in FM, TV and radar systems and networks. Air cables also have better flexibility and crush resistance than other solutions such as rigid lines.

FEATURES / BENEFITS

  • Low Attenuation
    The low attenuation of this coaxial cable results in highly efficient signal transfer in your RF system.
  • Complete Shielding
    The solid outer conductor of this coaxial cable creates a continuous RFI/EMI shield that minimizes system interference.
  • Low VSWR
    Standard and low VSWR versions of this coaxial cables contribute to low system noise.
  • Outstanding Intermodulation Performance
    Coaxial cable's solid inner and outer conductors virtually eliminate intermods. Intermodulation performance is also guaranteed by the state-of-the-art manufacturing process at the factory.
  • High Power Rating
    Low attenuation, outstanding heat transfer properties and temperature stabilized dielectric materials enable cable to provide long operating life at high transmit power levels.
  • Wide Range of Application
    Air cables are good choices for telecom, broadcasting, radar and HF defense applications.


Unjacketed Air Dielectric Coaxial Cable

Technical features

Applications

ApplicationsWireless CommunicationTV & RadioHF DefenseMobile RadioCable Solutions

Structure

Cable TypeAir-Dielectric, Corrugated, Unjacketed
Size7/8
Jacket OptionUnjacketed
Inner Conductor Diameter mm (in)9 (0.35)
Inner Conductor MaterialCopper Tube
Dielectric Diameter mm (in)20.2 (0.79)
Dielectric MaterialHelical Polyethylene Spacer
Outer Conductor Diameter mm (in)25.5 (1)
Outer Conductor MaterialCorrugated Copper

Testing and Environmental

Fire PerformanceHalogene Free
Flame Retardant Jacket SpecificationsMeets the requirements according to: IEC60754-1, IEC60754-2
Installation Temperature °C(°F)-40 to 60 (-40 to 140)
Storage Temperature °C (°F)-70 to 85 (-94 to 185)
Operation Temperature °C(°F)-50 to 85 (-58 to 185)

Electrical Specifications

Impedance Ω50 +/- 0.5
Maximum Frequency GHz3
Velocity %93
Capacitance pF/m (pF/ft)71 (21.6)
Inductance uH/m (uH/ft)0.178 (0.054)
Peak Power Rating kW73
RF Peak Voltage Volts2700
Jacket Spark Volt RMS8000
Inner Conductor dc Resistance Ω/1000 m (Ω/1000 ft)1.1 (0.34)
Outer Conductor dc Resistance Ω/1000 m (Ω/1000 ft)0.88 (0.27)
Return Loss (VSWR) PerformanceTypical 20.8dB (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.
Phase Stabilized

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

Temperature & PowerStandard

Mechanical Specifications

Cable Weight, Nominal kg/m (lb/ft)0.68 (0.46)
Minimum Bending Radius, Single Bendmm (in)100 (4)
Minimum Bending Radius, Repeated Bendsmm (in)250 (10)
Bending Moment Nm (lb-ft)27 (20)
Tensile Strength N (lb)1600 (360)
Recommended / Maximum Clamp Spacing m (ft)0.5 / 0.9 (1.8 / 3)

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

Frequency, MHzdB per 100mdB per 100ftPower, kW
0.5 0.08 0.03 73
1 0.12 0.04 73
1.5 0.14 0.04 70.90
2 0.16 0.05 61.40
10 0.37 0.11 27.30
20 0.52 0.16 19.20
30 0.64 0.19 15.70
50 0.83 0.25 12.10
88 1.10 0.34 9.11
100 1.18 0.36 8.49
108 1.23 0.37 8.15
150 1.45 0.44 6.92
174 1.57 0.48 6.39
200 1.69 0.51 5.94
300 2.08 0.63 4.84
400 2.42 0.74 4.17
450 2.57 0.79 3.93
500 2.72 0.83 3.71
512 2.76 0.84 3.66
600 3 0.91 3.37
700 3.25 0.99 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 1.20 2.59
1250 4.45 1.36 2.30
1500 4.91 1.50 2.10
1700 5.26 1.60 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 1.90 1.68
3000 7.22 2.20 1.47

External Document Links

Notes