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RL478-50ALU
4-7/8" Unflanged Rigid Line (Aluminium outer conuctor)

Rev : 03 | Rev date : 11 Aug 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 indoor connections between RF broadcasting equipment.

 

FEATURES / BENEFITS

  • Inner conductor is of the highest purity copper (99.95%) for minimum attenuation and lowest operating temperature.
  • Outer conductor is made from lightweight aluminium, easy to cut and install
  • Materials are milled to exact dimensions to ensure strict compliance with specifications and stable characteristic impedance.
  • Elbow spigots and couplings are of silver-plated brass for high conductivity.

 


4 7/8" Unflanged Rigid Line

Technical features

Structure

Product LineRigid Line
Product TypeUnflanged rigid line (Aluminium outer conductor)
Size4-7/8"
Feeder TypeRigid coaxial transmission line (unflanged)
Outer Conductor Material6060-T8 Aluminium
Outer Conductor OD mm (in)123.2 (4.85)
Outer Conductor ID mm (in)120 (4.724)
Inner Conductor MaterialC102000 Copper, 99.95% pure
Inner Conductor OD mm (in)52.1 (2.051)
Inner Conductor ID mm (in)50.1 (1.972)

Electrical Specifications

Maximum Frequency MHz862
ImpedanceΩ50 +/- 0.5
Relative Propagation Velocity%99.8
Peak Power Rating kW2160
RF Peak VoltagekV14.7

Mechanical Specifications

Weight kg/m (lb/ft)3.7 (2.48)
FinishNatural
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)
Humidity95%, non condensing

Attenuation and Power Rating

Frequency, MHzAttenuation, dB/ 100mAttenuation, dB/ 100ftAverage Power kW
(Note 1)
Average Power kW
(Note 2)
500.140.044153205
880.190.059115154
980.200.062109146
1080.210.065104139
1500.250.07788118
1740.270.08282110
2020.290.08976102
2400.320.0977093
3000.360.1086284
4000.410.1255472
4700.440.1355067
5000.460.1404865
5200.470.1434763
6000.500.1534459
6650.530.1614256
7190.550.1684054
8000.580.1773851
8200.590.1793851
8620.600.1833749

Attenuation at 20°C (68°F)
Mean power rating at 40°C (104°F) ambient temperature
Note 1. Outer temp rise 24°C (75°F), Inner temp rise 65°C (149°F)
Note 2. Outer temp rise 30°C (86°F), Inner temp rise 85°C (185°F)
Note 3. Custom lengths are available on request

Elbows

Elbow Model NoRL478-50ALU-ELRL478-50ALU-ELT
Elbow TypeNon-tuneableTuneable
VSWR 0-862 MHz1.025:11.014:1
Elbow Weightkg (lb)5.3 (11.7)5.6 (12.3)

Accessories

Accessory Model NoRL478-50ALU-STRRL478-50AL-FLARL478-50-IJKRL478-50-SHRAD49U-N
Accessory DescriptionStraight Coupling - Inner & OuterFlange Adaptor - Clamp TypeIEC Inner Joining KitSuspension Hanger4-7/8"u/f - Type N
Adaptor
Accessory Weight kg (lb)0.54 (1.19)0.7 (1.54)1.3 (2.9)1.3 (2.9)2 (4.4)