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RL318-50U
3-1/8" Unflanged Rigid Line

Rev : 02 | Rev date : 31 May 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".
3-1/8" 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 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 rigid line is painted for a high quality long lasting finish, which also aids in heat dissipation.
     


3 1/8" Unflanged rigid Line

Technical features

Structure

Product LineRigid Line
Product TypeUnflanged rigid line, copper
Size3-1/8"
Feeder TypeRigid coaxial transmission line (unflanged)
Outer Conductor MaterialC110000 Copper, 99.9% pure
Outer Conductor OD mm (in)79.4 (3.125)
Outer Conductor ID mm (in)76.8 (3.023)
Inner Conductor MaterialC102000 Copper, 99.95% pure
Inner Conductor OD mm (in)33.4 (1.315)
Inner Conductor ID mm (in)31.3 (1.232)
Dielectric MaterialAir, with PTFE spacers

Electrical Specifications

Maximum Frequency MHz1600
ImpedanceΩ50 +/- 0.5
Relative Propagation Velocity%99.8
Peak Power Rating kW920
RF Peak VoltagekV9.6

Mechanical Specifications

Weight kg/m (lb/ft)3.8 (2.6)
FinishAcrylic paint
Recommended clamp spacing m (ft)2 (6)

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)
500.230.0697196
880.300.0925472
980.320.0975168
1080.330.1014965
1500.390.1194155
2020.450.1393648
2400.500.1513344
3000.550.1692939
4000.640.1952534
4700.690.2122331
5000.720.2182330
5200.730.2222230
6000.780.2392128
6650.830.2522026
7190.860.2621925
8000.910.2761824
8200.920.2791824
8620.940.2861723

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 NoRL318-50U-EL
Elbow Type3-1/8" Unflanged Elbow - male with coupling sleeves
Elbow Weightkg (lb)2.22 (4.89)

Accessories

Accessory Model NoRL318-50U-STRAD31U-NRL318-50-FLARL318-50-IJKRL318-50-SHR
Accessory DescriptionStraight Coupling - Inner & Outer3-1/8" u/f - Type N AdaptorFlange Adaptor- Clamp TypeEIA Inner Joining KitSuspension Hanger
Accessory Weight kg (lb)0.33 (0.73)1.2 (2.65)0.98 (2.16)0.98 (2.16)1.11 (2.25)