User's Guide

TW223 User guide.docx 5 of 6
Repeaters and MDT Devices Placement
1. Repeaters Backbone
With the DCAP Unit powered up, the repeater backbone should next be placed. Repeaters turn
on automatically when power is applied. Their LEDs will turn off after a few minutes to save
power but can be turned back on by pressing the pushbutton on the front panel. Start with
units closer to the DCAP/AP, and use the LED feedback indication to verify the range is
acceptable. At first just the minimum numbers of repeaters can be placed, and it is necessary
that they be within range (solid 10 second LED “flash” when button pushed) for the backbone
to be reliable. Repeater to Repeater (or DCAP) range in open field scenarios is in excess of 1/2
mile, however building construction materials, terrain, and poor location choices can reduce this
down to hundreds of feet or less.
2. MDT placement
Once the initial Repeater placement is complete, the MDT placement phase begins. Again the
LED feedback can be used to verify that MDTs are communicating with the network. Additional
repeaters can be placed in areas where MDTs are unable to connect to the backbone. MDT to
Repeater (or DCAP) range in open field scenarios is in excess of 1500 feet, however building
construction materials, terrain, and poor location choices can reduce this down to a hundred
feet or less.
The CIT software can also be used in the placement phase to provide more detailed information
such as Link Quality and Signal Strength readings generated by MDT and Repeaters.
Mounting Guidelines
Units should never be placed directly on a metal surface or within a metal enclosure. Mounting
on a metal surface will significantly affect the radio performance of the device, be it an MDT or
a Repeater.
Recommended placement
- Mount on nearby wall away from meter and copper /metal piping
or conduit.
- RF performance is best when mounted on wallboard
- Use keyhole shape to mount on screw in wall
- Designed for #6 Drywall screw
- Separate case to tighten screw if desired
- Note Antenna Pattern shown on the right.
- Radio signal slightly attenuated along the long axis of the MDT
case
Warning: All radio devices should be placed at least 8 inches (20 cm) away from people in
order to minimize RF exposure.