Rainbow-electronics GT864-PY Instrukcja Użytkownika Pobierz pdf (Strona 15)

GT864-QUAD/PY Hardware User Guide

1vv0300756 Rev.0 08/05/07

5.1.2.1 The antenna cable

Use 50Ω impedance low-loss cable and high-quality 50Ω impedance connectors (frequency range up

to 2GHz) to avoid RF losses. Ensure that the antenna cable is as short as possible. The Voltage

Standing-Wave Ratio (VSWR) may depend on the effectiveness of the antenna, cable and

connectors. In addition, if you use an adapter between the antenna cable and the antenna connector,

it is crucial that the antenna cable is a high-quality, low-loss cable. Minimize the use of extension

cables, connectors and adapters. Each additional cable, connector or adapter causes a loss of signal

power.

5.1.2.2 Antenna Connector

The Telit GT864 Terminal antenna connector allows transmission of radio frequency (RF) signals

between the modem and an external customer-supplied antenna. The modem is fitted with a 50Ω FME

male coaxial jack.

Description of antenna connector parameters:

Parameter Limit Description

Nominal impedance 50Ω (SWR better than 2.5:1)

Output Power

Watt peak (Class 4)

1 Watt peak (Class 1)

Extended GSM900

GSM1800

Static Sensitivity

Better than –102dBm

Extended GSM900

GSM1800

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