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Antennas
QAM Snare Navigator Plus requires a GPS antenna and multiple RF antennas, the
quantity of which varies depending upon the number of channels being monitored.
When the device is cradled, the all antennas are fed through the BNC connector at the
bottom of the cradle, adjacent to the screw-on power jack input. The RF antennas and
GPS signal are combining utilizing combiners that ship with the device, and all connect
to the BNC connector. When the Navigator Plus is removed from the cradle, GPS lock is
retained and the GPS antenna is no longer required. Additionally, the antenna input
automatically switches to the coaxial antenna input on the top of the unit – where a
loop dipole antenna, rubber duck, or combination antenna should be connected.
GPS antenna
A GPS or GPS/Glonass antenna is required for correlation time synchronization as
well as to establish vehicle GPS coordinates such that the samples from the correct hub
are transmitted to the device from the server. These GPS coordinates are also used for
the advanced Time Difference of Arrival (TDOA) leak location algorithm.
The GPS antenna can be either magnetic or permanent mount, and it needs to be
located at some place on the vehicle with visibility to the sky.
RF roof antenna
One, two, or three RF antennas are utilized depending upon the number of
channels being monitored for leakage. Antennas are magnetic or permanent mount,
and they require a magnetic ground plane underneath them to operate properly. They
should additionally be placed as distant from each other as reasonably possible. They
should not touch any roof structures on the vehicle. Equipment is available to tune the
antenna to the installed environment, by cutting to the correct length – and this should
be part of any installation process. Calibration antennas are also available as
necessary to properly calibrate the device.
RF walk mode antenna
For use in Walk mode, while moving around detecting leaks. For low frequency,
rubber duck antennas are used. For high frequency, dipole loop antennas are used.
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