Antenna Options; Primary Cellular Antenna; Rx Diversity Cellular Antenna; Gps Antenna - Logic Data Systems L-5500 Manual

2.7.

Antenna Options

Antennas are available for L-5500 radio modems installations from Logic Data Systems.
2.7.1.

Primary Cellular Antenna

The L-5500 product requires a multi-band cellular antenna for operation in the 800 MHz
band, the 1900 MHz band, and the 2100 MHz band. The primary antenna connection on the
L-5500 unit is an SMA female connector; therefore you must purchase an antenna with an
SMA male connector. Do not select an SMA antenna with "reverse polarity" or RP-Male.
Mounting options and cable lengths are the user's choice and application specific.
Caution: To comply with FCC approval for this device, do not use a cellular antenna with a
gain greater than 5 dBi in the cellular (800MHz) band, or 4 dBi in the 1900MHz band.
2.7.2.

RX Diversity Cellular Antenna

The L-5500 radio modem RX Diversity antenna has the same requirements as the primary
antenna with the exception of the connection. The RX Diversity antenna connection on the
L-5500 product is an SMA female connector; therefore an antenna with an SMA Male
connection is required. Mounting options and cable lengths are the user's choice and
application specific. For best performance, separation between the Primary and Diversity
antenna should be at least 5/8 wavelength (=8 inches or 20 cm for 915 MHz).
Caution: To comply with FCC approval for this device, do not use a cellular antenna with a
gain greater than 5 dBi in the cellular (800MHz) band, or 4 dBi in the 1900MHz band.
2.7.3.

GPS Antenna

The L-5500 radio modem's GPS connector requires an external 3.3V GPS antenna. The GPS
antenna connection on the L-5500 product is a female SMA connector; therefore an antenna
with an SMA male connector is required. For best coverage, use an active antenna with a
gain >25dB. Mounting options and cable lengths are user's choice and application specific.
2.7.4.

WiFi Antenna

The WiFi antenna connection on the L-5500 product is an RP-SMA jack; therefore an
antenna with an RP-SMA plug is required. Mounting options and cable lengths are user's
choice and application specific.
2.7.5.

Antenna Spacing

Referring to Figure 4 for illustration, the L-5500 radio modem commonly uses four
separate antennas:
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