RL478-50
4-7/8" Flanged Rigid Line

Rev : 02 | Rev date : 01 Jun 2022

RFS manufactures a range of unflanged and flanged rigid coaxial transmission lines and accessories to meet all commonly used EIA/IEC standards from 1-5/8" to 8-3/16".
4-7/8" unflanged rigid line is a 50-ohm rigid coaxial transmission line, and is ideal for outdoor or indoor connections between RF broadcasting equipment.

FEATURES / BENEFITS

Inner and outer conductors are made from the highest purity copper (99.95% for inner, 99.9% for outer) for minimum attenuation and lowest operating temperature.
Manufactured from hard drawn copper, milled to exact dimensions to ensure strict compliance with specifications and stable characteristic impedance.
All spacers/insulators are of virgin PTFE for highest physical and electrical insulation properties.
The outer conductor is painted for a high quality long lasting finish, which also aids in heat dissipation.
Swivel flange on one end for ease of assembly.
Suitable for pressurised systems.

4 7/8" Flanged Rigid Line

Technical features

Structure
Product Line		Rigid Line
Product Type		Flanged rigid line
Size		4-7/8"
Feeder Type		Rigid coaxial transmission line (flanged)
Outer Conductor Material		C110000 Copper, 99.9% pure
Outer Conductor OD	mm (in)	123.2 (4.85)
Outer Conductor ID	mm (in)	120 (4.724)
Inner Conductor Material		C102000 Copper, 99.95% pure
Inner Conductor OD	mm (in)	52.1 (2.051)
Inner Conductor ID	mm (in)	50.1 (1.972)
Dielectric Material		Air, with PTFE spacers

Electrical Specifications
Maximum Frequency	MHz	862
Impedance	Ω	50 +/- 0.5
Relative Propagation Velocity	%	99.8
Peak Power Rating	kW	2160
RF Peak Voltage	kV	14.7

Mechanical Specifications
Weight (5.5m or 18ft length)	kg (lb)	39.5 (87.1)
Finish		Acrylic paint
Recommended clamp spacing	m (ft)	2 (6.5)

Ordering Information
Standard Lengths	mm (ft)	2750, 5500 (9, 18) [Note 3]

Environmental Specifications
Ambient Temperature Range	°C(°F)	-40 to + 60 (-40 to 140)
Humidity		95%, non condensing

Attenuation and Power Rating
Frequency, MHz	Attenuation, dB/ 100m	Attenuation, dB/ 100ft	Average Power kW (Note 1)	Average Power kW (Note 2)
50	0.14	0.044	153	205
88	0.19	0.059	115	154
98	0.20	0.062	109	146
108	0.21	0.065	104	139
150	0.25	0.077	88	118
174	0.27	0.082	82	110
202	0.29	0.089	76	102
240	0.32	0.097	70	93
300	0.36	0.108	62	84
400	0.41	0.125	54	72
470	0.44	0.135	50	67
500	0.46	0.140	48	65
520	0.47	0.143	47	63
600	0.50	0.153	44	59
665	0.53	0.161	42	56
719	0.55	0.168	40	54
800	0.58	0.177	38	51
820	0.59	0.179	38	51
862	0.60	0.183	37	49


Attenuation at 20°C (68°F) Mean power rating at 40°C (104°F) ambient temperature Note 1. Outer temp rise 23°C (73°F), Inner temp rise 60°C (140°F) Note 2. Outer temp rise 30°C (86°F), Inner temp rise 80°C (176°F) Note 3. Custom lengths are available on request

Elbows
Elbow Model No		RL478-50-EL
Elbow Type		4-7/8" Flanged Elbow
Elbow Weight	kg (lb)	6.7 (14.8)

Accessories
Accessory Model No		RL478-50-FHS	RL478-50-FLA	RL478-50-IJK	RL478-50-SHR	AD49-N	RL478-50-GSB
Accessory Description		Flange Adaptor - hard solder	Flange Adaptor - clamp type	IEC Inner Joining Kit	Suspension Hanger	4-7/8" IEC to Type-N Adaptor	Gas Barrier
Accessory Weight	kg (lb)	1.2 (2.6)	2.1 (4.6)	1.3 (2.9)	1.3 (2.9)	2.95 (6.50)	5.2 (11.46)