Specifications

L70 Hardware Design
L70_HD_V1.0 - 12 -
The following picture has shown the rough relationship between power consumption and the different
scenarios in daily life when the AlwaysLocate
TM
mode is enabled.
Figure 2: AlwaysLocate
TM
mode
The position accuracy in AlwaysLocate
TM
mode will be somewhat degraded, especially in high speed.
So this mode is not recommended in the applications of vehicle system.
AlwaysLocate
TM
mode is disabled by default. Using the MTK proprietary commands can enable the
AlwaysLocate
TM
mode. Please refer to the following commands to set the AlwaysLocate
TM
mode.
Enable AlwaysLocate
TM
mode: $PMTK225,8*23；Return: $PMTK001,225,3*33
Back to normal mode: $PMTK225,0*2B
2.4.3. Multi-tone AIC
Up to 12 multi-tone AIC (Active interference Cancellation) can provide effective narrow-band
interference and jamming elimination. The GPS signal could be recovered from the jammed signal,
which can ensure better navigation quality.
Because different applications (Wi-Fi, GSM/GPRS, 3G/4G, Bluetooth) are integrated into navigation
system, the harmonic of RF signal will influence the GPS reception. The multi-tone AIC can reject
external RF interference which comes from other active components on the main board, to improve
the capacity of GPS reception without any hardware change in the design.
AIC function is enabled by default. The following commands can be used to set AIC function.
Enable AIC function: $PMTK 286,1*23
Disable AIC function: $PMTK 286,0*22
Quectel
Confidential