Rainbow Electronics GT863-PY - Manual (Page 19)

GT863-PY Terminal Product Description
80269ST10026a Rev. 0 - 27/09/06
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 19 of 50
2.10 Antenna
2.10.1 Antenna Output
NOTE: BEFORE connecting the GT863-PY to a Power Supply source, a suitable Antenna shall be
connected and properly installed.
As accessory, a magnetic surface mount antenna with 2.5dBi gain, ca. 2.5 m of coaxial cable and
SMA connector is available.
The antenna has to be installed with care in order to avoid any interference with other electronic
devices and has to guarantee a minimum distance from persons (20 cm). In case this requirement
cannot be satisfied, the system integrator has to assess the final product against the SAR
regulation.
For a good efficiency of the antenna and minimum interference with other electronic systems, a
space of min. 40 cm around the radiating part should be free, at least of electrically conducting
materials (except the ground plane on which it is attached).
Less distance and less obstacles there are between the antenna connected to the GT863-PY
Terminal and the antenna of the GSM/GPRS network base station, the less power is radiated by
the Terminal under normal conditions and the higher is the safety margin in case of disturbances.
A check of eventual interferences can be made when the GT863-PY Terminal transmits at
maximum power level to register to a GSM 900 network (see frequency channel numbers),
immediately after being switched on.
2.10.1.1 Antenna Connector
The Telit GT863-PY includes a SMA bulkhead female, class 4 (2W) co-axial connector for the
external antenna.
2.10.1.2 Antenna Specification
The antenna to be connected shall fulfil the following requirements:
Frequency range Depending by frequency band(s)
provided by the network operator, the
customer shall use the most suitable
antenna for that/those band(s)
Bandwidth 80 MHz in EGSM 900, 70 MHz if GSM
850, 170 MHz in DCS, 140 MHz PCS
band
Gain 1.5dBi
≤ Gain < 3dBi (referenced to
isotropic radiator)
Impedance 50 Ohm
Input power > 2 W peak power
VSWR absolute max <= 10:1
VSWR recommended <= 2:1