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RL478 Series
Rigid Line Components 4 7/8” 50 ohm

RFS rigid line components are available for both unpressurized (indoor) and pressurized, flanged (outdoor) systems. ;
Sizes available are 7/8", 1-5/8", 3-1/8", 4-1/2", 4-7/8", 6-1/8" and 7-3/16�.
All components are manufactured to the most exacting tolerances.
Other line sizes are available on special order.

FEATURES / BENEFITS

  • Line inner and outer tubing is of high conductivity, hard-drawn, copper, milled to exact dimensions. Unflanged components for indoor use are polished and sprayed with a clear lacquer to maintain a high lustre finish
  • Flanges and mitred elbow joints are TIG welded for maximum strength
  • Captive PTFE dielectric insulators are used exclusively in lines and elbows to ensure precision mating and stability of components after assembly
  • All inner conductor connectors are silver plated
  • All components conform to the relevant EIA or IEC standards

Technical features

Structure

Product LineComponents
Product TypeCopper Rigid Line Components 4-7/8" 50 ohm
Size4-7/8
Feeder TypeAir Dielectric, solid inner and outer PTFE spacers
Conductor MaterialHigh conductivity copper tube
Outer Conductor OD mm (in)123.2 (4.85)
Outer Conductor ID mm (in)120 (4.724)
Inner Conductor OD mm (in)52.1 (2.051)
Inner Conductor ID mm (in)50.1 (1.972)

Electrical Specifications

Frequency Range MHz50 - 862
Frequency BandVHF Band I, VHF Band II, VHF Band III, UHF Band IV/V
Impedance, ohmsΩ50 +/- 0.5
Velocity%99,8
Peak Power Rating kW2160
RF Peak Voltage, VoltsV14700
Part number EIA Flanged RL51,755
Length EIA Flanged RL mm55
Isolation dB32
Output Power SplitdB3 +/- 0.15 Note#2
Output Phasedegrees90 +/- 1 Note#2

Mechanical Specifications

Weight kg/m (lb/ft)7.1 (4.76)
Flange Weight kg (lb)1.5 (3.3)
Flange StandardIEC
Standard lengths m (ft)5.5 (18)
Max. indoor clamp spacing m (ft)2 (6.5)
Max. exterior clamp spacing m (ft)1.2 (4)

Ordering Information

Length Unflanged RL m55
Part number Unflanged RL51,855

Attenuation and Power Rating

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 Table CommentAttenuation at 20°C (68°F) cable temperature
Mean power rating at 40°C (104°F) ambient temperature
#1 Outer temp rise 23°C (73°F), Inner temp rise 80°C (176°F)
#2 Outer temp rise 30°C (86°F), Inner temp rise 100°C (212°F)
Applying a dark matt finish will reduce max temp rises.

External Document Links

Notes