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HCA300-50J

HCA300-50J
3" HELIFLEX^® Air-Dielectric Coaxial Cable

Name: 3" HELIFLEX ® Air-Dielectric Coaxial Cable
SKU: HCA300-50J

Rev : E | Rev date : 15 Jan 2026

HELIFLEX® 3" 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

29.3mm (1.15in)

Dielectric Diameter

63.5mm (2.5in)

Outer Conductor Diameter

72.4mm (2.85in)

Jacket Diameter

76mm (2.992in)

Cable Weight

2.1kg/m (1.41lb/ft)

Min Bending Radius, Single Bend

270mm (11in)

Min. Bending Radius, Repeated Bends

760mm (30in)

Bending Moment

145 Nm (107 lbf*ft)

Tensile Strength

1,800N (405lb)

Air Volume

3l/m (0.0323ft³/ft)

Recommended / Maximum Clamp Spacing

0.8 / 1.2 m (2.75 / 4 ) ft

Electrical Specifications

Impedance

50 +/- 0.5 Ω

Max. Operating Frequency

1.63 GHz

Velocity

96 %

Capacitance

66.6pF/m (20.3pF/ft)

Inductance

0.167µH/m (0.051µH/ft)

Peak Power Rating

640 kW

RF Peak Voltage

8,000 V

Jacket Spark

8,000 V RMS

DC-Resistance Inner Conductor

0.39Ω/km (0.12Ω/kft)

DC-Resistance Outer Conductor

0.16Ω/km (0.05Ω/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	0.028	0.009	596
1	0.04	0.012	421
1.5	0.049	0.015	343
2	0.056	0.017	297
10	0.127	0.039	132
20	0.181	0.055	92.3
30	0.223	0.068	74.9
50	0.291	0.089	57.4
88	0.391	0.119	42.8
100	0.418	0.127	40
108	0.436	0.133	38.4
150	0.519	0.158	32.2
174	0.561	0.171	29.8
200	0.605	0.184	27.7
300	0.754	0.23	22.2
400	0.883	0.269	19
450	0.943	0.287	17.8
500	1	0.305	16.8
512	1.01	0.309	16.6
600	1.11	0.338	15.2
700	1.21	0.368	13.9
800	1.3	0.398	13
824	1.33	0.404	12.7
894	1.39	0.424	12.1
900	1.4	0.425	12.1
925	1.42	0.432	11.9
960	1.45	0.441	11.6
1000	1.48	0.452	11.4
1250	1.69	0.515	10
1500	1.88	0.573	9.04
1700	2.03	0.618	8.39

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.