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HCA300-50JB

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

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

Rev : C | Rev date : 15 Nov 2025

HELIFLEX® 3" 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

Jacket Option

Black

Inner Conductor Diameter

29.3mm (1.15in)

Inner Conductor Material

Corrugated Copper Tube

Dielectric Diameter

63.5mm (2.5in)

Dielectric Material

Helical Polyethylene Spacer

Outer Conductor Diameter

72.4mm (2.85in)

Outer Conductor Material

Corrugated Copper

Jacket Diameter

76mm (2.992in)

Jacket Material

Polyethylene, PE, Bitumen Filling

Testing and Environmental

Fire Performance

Halogene Free

Flame Retardant Jacket Specifications

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

Installation Temperature

-25°C to 60°C (-13°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

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

8000 Volts

Jacket Spark

8000 Volt RMS

Inner Conductor dc Resistance

0.39ohm/1000 m (0.12ohm/1000 ft)

Outer Conductor dc Resistance

0.16ohm/1000 m (0.05ohm/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

2.6kg/m (1.78lb/ft)

Minimum Bending Radius

360mm (14in)

Minimum Bending Radius

760mm (30in)

Bending Moment

145 (107)

Tensile Strength

1800N (405lb)

Recommended / Maximum Clamp Spacing

0.8 / 1.2 (2.75 / 4)

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

Frequency, MHz	dB per 100m	dB per 100ft	Power, kW
0.5	0.028	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