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GE863-PRO
3
Hardware User Guide
1vv0300773a Rev. 0 - 24/01/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 35 of 64
6.3 GSM Antenna - installation Guidelines
• Install the antenna in a place covered by the GSM signal.
• The Antenna must be installed to provide a separation distance of at least 20 cm from all persons
and must not be co-located or operating in conjunction with any other antenna or transmitter;
• Antenna shall not be installed inside metal cases
• Antenna shall be installed also according Antenna manufacturer instructions.
6.4 Electro Magnetic Interference - Guidelines
The GE863-PRO
3
has been particularly designed in order to keep to a minimum the Electro Magnetic
Interferences between the ARM part and the GSM/GPRS engine, however especially the ARM part
remains a noisy device that must be threaten with care in order to avoid that its EMI affect the GPRS
part through an external coupling.
Therefore:
• Keep fast ARM lines far away from Antenna line in order to avoid direct coupling;
• Keep fast ARM lines buried in the inner layers, with Ground Layers [fenced with vias] on the
top/bottom layers;
• If your lines are long, place a series resistor [ in the range of 47Ω – 100 Ω ] close to the GE863-
PRO
3
ARM ball to reduce the ringing and the EM emissions of the signal
• If your PCB lines are very long, place a terminator resistor close to the device line end.