User's Guide

7. Reattach the two halves of the charge base around the body of the IMR-FT. Insert the four
screws into the base and tighten them to 4 to 6 inch-pounds of torque.
Servicing the IMR-FT External Antenna
Regularly perform the following basic maintenance procedures to ensure optimal performance
of your antenna.
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Inspecting the Antenna Connectors and Cables on page 36
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Inspecting the Antenna Base and Whip on page 36
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Cleaning the Antenna on page 37
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Replacing the Antenna Gasket on page 37
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Replacing the Antenna Cable on page 38
Inspecting the Antenna Connectors and Cables
The connections and cables to the radio typically experience the most wear. Many customers
remove the radio on a daily basis. Removing and installing the connectors daily can cause the
cable and connector to begin separating. This is considered normal wear and tear.
The coax cables (used in the magnetic mount base) can be damaged if they are accidentally
pinched in a window or door jamb. Any damage to the coax cables or the connectors will lead to
decreased reading performance and transmitter failures due to high reflected power.
1. Create a regular maintenance schedule and inspect the following.
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Coax cables
•
Ensure the cable is not loose from the connector.
•
Inspect for hard kinks or bends in the cable, which can cause an electrical short.
•
Inspect for cuts or nicks in the cable.
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Coax shield. Do not expose the inner cable shield at the connector or anywhere along
the cable.
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Connector. The center pin of the connector should not be recessed or pushed in to the
connector housing.
2. Replace the entire antenna mount if the cables or connectors are damaged. Contact Itron
Support Services if you need assistance.
Inspecting the Antenna Base and Whip
The antenna whip is the radiating element that both transmits and receives the signals for the
system. The whip attaches to a base. The base is either mounted permanently through the roof
of the vehicle, or is a magnet mount. Moisture can build up between the base and the mount.
This moisture buildup leads to oxidation and corrosion which results in a loss of signal quality.
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Itron Mobile Radio User Guide Chapter 8 Maintaining your Itron Mobile Radio