Logic Data Systems L-5500 Manual page 11

 "T" - Main transceiver - Constraints are the limit of 20 cm and omni-directional
factors
 "R" - Auxiliary receiver – Constraints are the receiver spacing of at least 5/8 λ
(wavelength) from transceiver antenna and omni-directional requirements
 "G" - Global Positioning System (GPS) - Constraints are TX spacing of at least
60cm/23.62 inch from all transmitting antennas and a clear view of the sky.
 "W" – WiFi antenna - Constraints are TX spacing of at least 8 inches or 20 cm from
all transmitting antennas
Note: For units utilizing diversity cellular antennas, best overall operation is achieved
utilizing antennas with equal gains.
WARNING: As per FCC rules, all L-5500 transmitting antennas (T & W) should be at a
minimum of eight (8) inches (approximately 20 centimeters) from all persons.
Figure 4 - Antenna Spacing (T: primary antenna, R: diversity antenna, W: WiFi antenna, G:
For installation of ground-plane dependent antennas (main cellular and WiFi antennas), the
center of the metal surface used for mounting is preferable for best omni-directional
pattern. For ground-plane independent antennas (diversity and GPS antennas), installation
may be close to the edges of the surface.
For vehicular installations Logic Data Systems recommends the following antenna positions:
 Most preferred for all antennas: centerline of roof. For transmitter antenna, it is the
ONLY acceptable position.
GPS antenna)
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