Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

 
ON THIS PAGE
 

Antenna Cable Specifications

Antenna Cable Specifications

The following topology (Figure 1) depicts the antenna cable connections with connector types. Use this topology as an example to install the antenna cables.

Figure 1: Cable Connections

Diagram showing GPS antenna system setup: L1 Antenna connects via TNC to Surge Protector with N-type connectors, linked to TB-1 Receiver by LMR400 cable. ACX7024 receives 1PPS and 10 MHz signals, optional grounding available.Juniper has tested this topology with the following cables:

You must ensure that you install a surge protector to protect the GNSS receiver from lightning surges. The surge protector next to the outdoor antenna must be a safety-certified antenna surge protector (certified to UL 497B or its IEC equivalent). The topology shown in Figure 1 uses a Polyphaser surge protector. For more information about the Polyphaser surge protector, see Type N M/F Coaxial RF Surge Protector.

Note:

You must ensure that the surge protector is grounded. To ground the Polyphaser surge protector, use a 10 AWG to 12 AWG grounding wire. For more information about grounding the surge protector, see GX, VHF, VUF Series Mounting & Grounding.

The following sections describe the antenna cable specifications:

LMR400 (10-m Segment) Cable Specifications

Technical drawing of a coaxial cable assembly with TNC Male and N Female connectors, dust caps, black heat shrink tubes, 10.29 mm diameter, and 10000 mm length.

Electrical Characteristics

Impedance

50 Ω

Frequency

DC-3GHz

Voltage Rating

335 Vrms

Dielectric Withstanding Voltage

> 1000 V

Insulation Resistance

> 5000 MΩ

LMR400 (95-m Segment) Cable Specifications

Technical drawing of coaxial cable assembly with N male and N female connectors, dust caps, black heat shrink tubes, 10.29 mm diameter, 95000 mm length.

Electrical Characteristics

Impedance

50 Ω

Frequency

DC-3GHz

Voltage Rating

335 Vrms

Dielectric Withstanding Voltage

> 1000 V

Insulation Resistance

> 5000 MΩ

RG-58 (1-m Segment) Cable Specifications

Technical drawing of a coaxial cable assembly with N male connector and SMA male connector, both with dust caps. Cable diameter 10.29 mm, total length 1000 mm with black heat shrink tubing near connectors.

RG58

Impedance

50 ± 2 Ω

Capacitance

100 pF/m

Velocity Ratio

66 %

Resistance

Inner Conductor- 36, 5 Ω/Km

Braid- 14 Ω/Km
Tension

Sheath and Spark testing- 4,0 kV

Cabling Guidelines

Follow these guidelines when you install cables:

  • Ensure that the GNSS dongle can track the satellites and can acquire a lock.

  • Examine the cable end points and connectors for any bends or damage.

  • Check the electrical continuity of the cable for both inner and outer conductors.

  • Check for any electrical short in cables.

  • Inspect the cable outer sheath for any damage.