User's Manual

DRAFT TrimTrac Locator Technical Manual 41
TrimTrac Locator Location
The TrimTrac locator should be used as close as possible to horizontal plane,
preferably with reasonably unobstructed clearance around the unit. If the current
location is suspect:
1. Try another location
2. Try a known, good TrimTrac locator or mobile phone.
Even in areas with strong GSM service, there may be pockets where GSM
service is poor or nonexistent due to how the carrier builds the network. Contact
your local service provider for information on GSM coverage.
GSM Jamming
The TrimTrac locator should be installed as far away as possible from other
transmitting antennas including satellite communication, radar, and VHF radio.
These transmitters may emit jamming signals that interfere with the GSM phone’s
ability to track the GSM signal. If there are other transmitting antennas located on
the vehicle, try moving the TrimTrac locator farther away from these antennas.
Generally, the stronger the other transmitting device, the wider the distance
required between antennas.
No Data Communication with Base
Check the conditions described in following sections if the TrimTrac locator
cannot communicate with the base and:
1. You can see that it enters the Transmit and Query modes.
2. You have verified that it is calling the correct number.
Base Modem Configuration
Consult your modem manual for configuration instructions. Each modem
manufacturer has its own settings and control commands. Verify that your
configuration, PIN numbers, and so on, are correct.
Defective TrimTrac Locator
To confirm that a TrimTrac locator is defective, do the following:
1. Try a known good TrimTrac locator.
2. Move into an area with strong GSM coverage.
3. Send the TrimTrac locator an SMS message requesting a response.
Note – Before returning the TrimTrac locator, be sure to save the TrimTrac
locator’s configuration settings, and remove your SIM