Rainbow Electronics GT864-PY - Manual (Page 15)

GT864-QUAD/PY Hardware User Guide
1vv0300756 Rev.0 08/ 05/07
Reproduction forbidden w ithout Telit Communications S.p.A. w ritten authorization - All Rights Reserved page 15 of 23
5.1.2.1 The antenna cable
Use 50 Ω impedance low-loss cable and high-quality 50 Ω 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 50 Ω FME
male coaxial jack.
Description of antenna connector parameters:
Parameter Limit Description
Nominal impedance 50 Ω (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
Better than –102dBm Extended GSM900
GSM1800