Operation Description

VLU11 Operation description
The VLU11 is a stolen vehicle recovery system (SVR), a single box enclosure incorporating a processor,
VHF Silent Radio Transceiver, GPS receiver, wireless data modem, vehicle-rated power supply.
BLE (Bluetooth LE): is not assembled in this product.
The cellular connectivity: provided by uBlox Sara-R410M certified under grants below:
FCC ID: XPY2AGQN4NNN
ISED: 8595A-2AGQN4NNN
The module without modification as delivered by UBlox is used and hence the default module power
settings are delivered to the antenna.
The used antenna is also a custom design for the product with 2.58 dbi peak gain.
VHF LoJack:
Transmits on a radio (RF) carrier frequency of 173.075 MHz.
There are two modes of operation for the low jack radio:
The tracking mode is activated whenever the vehicle is reported as stolen. In tracking mode the radio
transmits for 200 ms every 1 s.
Vehicles with the system installed send a 200 millisecond (ms) chirp every fifteen seconds on this
frequency when the car moves without a proper identification of the car key.
Under all other conditions the radio is in receive only mode.
The max power setting to the transmitter is as per settings used in testing and in the production is 33.62
dBm. The CC1125 low jack radio chip is set to 16 dBm output power. The power amplifier stage will
amplify by 17.5 dB.
The expected gain of the whip antenna is about -10 dBi.
Lowjack supports FSK modulation