Coaxial 7/8″ Feeder Cable

Description

7/8″ Feeder Cable is a type of RF coaxial cable which incorporates high foaming polyethylene insulation technology to minimize signal loss and have excellent electric features such as low damping and reflection coefficient. It is used in many applications where it is necessary to transfer radio frequency energy from one point to another such as Main feeder for mobile communication base stations, In-building distribution system and antenna feed lines of various wireless communication system.

This cable carries current in both the inner and the outer conductors. These current are equal and opposite and as a result all the fields are confined within the cable and it neither radiates nor picks up signals. This means that the cable operates by propagating an electromagnetic wave inside the cable. As there are no fields outside the coax cable it is not affected by nearby objects. Accordingly it is ideal for applications where the RF cable has to be routed through or around buildings or close to many other objects.

Specification

Specifications - Construction

Inner Conductor Copper tube Φ 9.3 mm
Dielectric Cellular polyethylene Φ 22.0 mm
Outer Conductor Corrugated copper tube Φ 25.2 mm
Jacketing Black, halogen-free fire-retardant thermoplastic /
Black, halogen-free polyethylene (optional)
Φ 27.8 mm
Marking Trademark, cable type, manufacture week, year, batch number and meter mark --

 

Specifications - Electrical Characteristics at +20°C

Characteristic Impedance 50 ± 1 Ω
Return Loss 24 dB for 100 m cable with connectors
Attenuation See table below
Velocity Factor 0.90
Capacitance 73.0 pF/m
Maximum Frequency 5100 MHz
Max Power Rating See table below
Peak RF Voltage Rating 3.2 kV
Peak Power Rating 92.0 kW
DC resistance Inner conductor: 1.11 Ω/km, Outer conductor: 1.11 Ω/km

 

Frequency (MHz) Attenuation (dB/100m) Power Rating (kW) Frequency (MHz) Attenuation (dB/100m) Power Rating (kW)
10 0.348 27 900 3.56 2.6
30 0.607 15 950 3.66 2.5
50 0.78 12 960 3.68 2.5
88 1.05 8.9 1000 3.77 2.5
100 1.12 8.3 1200 4.16 2.2
108 1.17 8.0 1400 4.53 2.0
174 1.49 6.2 1600 4.87 1.9
200 1.61 5.8 1800 5.20 1.8
300 1.98 4.7 1900 5.36 1.7
400 2.31 4.0 2000 5.51 1.7
450 2.46 3.8 2200 5.81 1.6
500 2.60 3.6 2400 6.11 1.5
512 2.63 3.5 2600 6.39 1.4
600 2.86 3.2 2800 6.66 1.4
700 3.11 3.0 3000 6.93 1.3
800 3.34 2.8 3400 7.44 1.2
850 3.45 2.7 4000 8.17 1.1
890 3.54 2.6 5000 9.30 1.0

* Attenuation values are typical at ambient temperature +20°C. Power rating ambient temperature +40°C, inner conductor +100°C.

Specifications - Mechanical Characteristics

Weight 0.49 kg/m
Maximum Pulling Force 2800 N
Minimum Bending Radius Single Bending: 120mm, Repeated Bending: 240 mm
Operating Temperature Range -55 ~ +80 °C
Crush Resistance 1.6 kg/mm
Bending Moment 15.0 Nm
Recommended Clamp Distance 1.0 m