WM_PRJ_Q2501_PTS_002
- 001
March
2004
confidential ©
Page:
56 / 79
This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged
without prior written agreement.
Ce document est la propriété exclusive de WAVECOM. Il ne peut être communiqué ou divulgué à
des tiers sans son autorisation préalable.
The GPS active antenna must fulfil the following requirements:
Characteristic
GPS
Frequency RX
L1 = 1575.42
MHz
Impedance
50
ohms
VSWR Rx max
1.5 : 1
/
Polarization
RHCP /
Antenna gain
(including cable losses)
Min.
15
Typ.
25
Max.
45
dB
Typical radiated gain
5
(at zenith)
dBi
Filtering
40 min (@
±
130 MHz of L1)
(rejection of GSM & DCS Tx band.
dB
Supply voltage
3 or 5
V
With GPS antenna external supply
Min.
Typ.
30
Max.
50
mA
With GPS antenna internal supply
Supply current
Min.
Typ.
10
Max.
mA
GPS Active antenna providers:
Refer to paragraph 9.7.
3.5.3.2 Active
antenna
implementation
Antenna implementation is more critical than GSM, since it directly impacts:
the received signal strength (far more lower than GSM),
the number of satellites seen by the receiver (the positioning error).
The following rules of thumb should be observed:
it should be in the same plan as the horizon,
it should have a full view of the sky,
the sky view must not be obstructed.
Summary of Contents for WISMO Quik Q2501
Page 69: ......
