Jackson Labs LTE-Lite, User Manual

Page: 8 / 34

LTE-Lite User Manual
4 © 2020 Jackson Labs Technologies, Inc.
The unit will start to search for satellites as soon as power is applied, and will start to lock the internal
TCXO to UTC as soon as a GPS antenna is attached and more than 4 sats become visible. After 30
minutes or less the unit should stabilize the frequency, and all ALARM indicators should be off
resulting in the Green “LOCK OK” LED to be lit up. At this time the Green LED will indicate the
unit is fully synchronized to UTC, and generating a stable and accurate 20MHz/19.2MHz/10MHz
output signal. The Green LED may go off momentarily from time to time as airflow touches the unit
or sats come in and out of view - this is normal behavior.
You may place the GPS antenna in a window, but it is recommended to place the GPS antenna with a
full view of the sky for best performance. The antenna cable can be extended to 100m or more with
high quality antenna cable (use quad shielded RG-6 75 Ohms cable, or high-quality 50 Ohms coax
cable) without significant loss of signal quality.
WARNING: Make sure to use a proper and certified Antenna Lightning Arrestor when placing
the antenna outside as lightning strikes can cause damage, injury, or death to equipment and
personnel.
Figure 2.1 LTE-Lite Evaluation Board with LTE-Lite Module
2.1.1 Airflow Warning
The LTE-Lite SMT module and thus the LTE-Lite Evaluation Board are very sensitive to airflow.
This includes airflow from convection, walking past the unit, or Air Conditioning systems. For
optimal performance the user must insure that the unit is shielded from any airflow by placing the
unit into an enclosure (for example Hammond PN: 1455C801BK). Please note that the external
DIP-14 TCXO and its socket must be removed from the PCB for it to fit into the aforementioned
Hammond enclosure. For optimal stability performance of the TCXO the unit should be sealed into
an airtight enclosure.