User guide

UC864-E/G/WD/WDU Hardware User Guide
1vv0300766a Rev.4
- 03/02/09
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights Reserved. Page 34 of 78
/WDU module. Antennas used for this OEM module must not exceed 3dBi gain for
mobile and fixed operating configurations.
6.2. GSM/WCDMA Antenna - Installation Guidelines
• Install the antenna in a place covered by the GSM/WCDMA 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 must not be installed inside metal cases;
• Antenna must be installed also according Antenna manufacturer
instructions.
6.3. GPS Antenna Requirements (UC864-G only)
The use of combined GPS antennas is NOT recommended; this solution could
generate an extremely poor GPS reception and also the combination antenna
requires additional diplexer and adds a loss in the RF route. The UC864-G module is
provided with an internal LNA amplifier.
The module is provided of an Antenna supply circuit with the following
characteristics:
• The supply voltage is 3.0 V DC;
• Supply enable controlled internally by the BB.
As suggested in the Product Description, the external active antenna for a Telit
UC864-G device must fulfill the following requirements:
ACTIVE GPS Antenna Requirements
Frequency range
1575.42 MHz(GPS L1 band)
Bandwidth
+/- 2 MHz
Gain
1.5 dBi < Gain < 4.5 dBi
Impedance
50 ohm
Amplification
Typical 14dB (max 15dB)
Supply voltage
3.0V
Current
consumption
Typical 20 mA (30mA max)
NOTE:
Ensure that the total LNA gain(within active antenna) before the GPS RF connector
of the UC864-G is less than 15 dB. Total LNA gain includes antenna cable loss, BPF
insertion loss and RF pattern loss. Excessive LNA gain (>15 dB) can introduce
jamming spurs, degrade 3IP, and saturate the GPS receiver.