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
Applications		Wireless Communication	TV & Radio	HF Defense	Mobile Radio	Cable Solutions

Structure
Cable Type		Air-Dielectric, Corrugated, Unjacketed
Size		7/8
Jacket Option		Unjacketed
Inner Conductor Diameter	mm (in)	9 (0.35)
Inner Conductor Material		Copper Tube
Dielectric Diameter	mm (in)	20.2 (0.79)
Dielectric Material		Helical Polyethylene Spacer
Outer Conductor Diameter	mm (in)	25.5 (1)
Outer Conductor Material		Corrugated Copper

Testing and Environmental
Fire Performance		Halogene Free
Flame Retardant Jacket Specifications		Meets 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	Ω	50 +/- 0.5
Maximum Frequency	GHz	3
Velocity	%	93
Capacitance	pF/m (pF/ft)	71 (21.6)
Inductance	uH/m (uH/ft)	0.178 (0.054)
Peak Power Rating	kW	73
RF Peak Voltage	Volts	2700
Jacket Spark	Volt RMS	8000
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) Performance		Typical 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 & Power		Standard

Mechanical Specifications
Cable Weight, Nominal	kg/m (lb/ft)	0.68 (0.46)
Minimum Bending Radius, Single Bend	mm (in)	100 (4)
Minimum Bending Radius, Repeated Bends	mm (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, MHz	dB per 100m	dB per 100ft	Power, 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