
5. Plug the UR91 into a LocoNet jack near where you plan to install it.
We recommend that you start with a central location that will likely
provide best coverage.
6. Power up the layout and track.
7. The Green LED on the UR91will be lit indicating the UR91 has
passed its internal self-tests and is ready to receive radio signals.
8. Install a 9 volt battery in your DT400R and plug it in to LocoNet.
9. While still plugged in, use the DT400R to select loco address "00” and
run it at 99% speed. (Since there are no locos on the track, nothing
is actually running. We will use this as a diagnostic to help deter-
mine the best location for your UR91 for optimal radio reception.
10. Change the direction of address "00" by pressing the Reverse Key or
double clicking the throttle knob associated with address 00.
Observe whether the signal was received by the system by the color
change on the command station’s TRACK STATUS indicator or
other method chosen from Section 22.2.
11. Unplug the DT400R. Move around the layout area stopping to test at
several locations. At each location, change the direction of address
"00" and observe that the command was received by the system.
Slowly rotate in place at each test location to check reception from
various directions. By moving around the whole layout area, you
will be able to determine whether any radio "blind spots" exist.
12. When you locate blind spots, adjust the location of the UR91until
you have good radio reception everywhere in the room.
13. Once you have determined the installation location that gives the best
reception, you can permanently mount the UR91 and hook up the
wiring under the layout.
The UR91’s green RADIO LED indicator on the UR91 will flicker as it
receives a good radio message from the DT400R. This indicates that
the radio link is working properly.
Troubleshooting Tip: If the green RADIO LED flickers but there is no
response from the command station or loco address, you probably
have a plug crimped in the reverse orientation on one of the
LocoNet cables. You should test all LocoNet cables using your LT1
to avoid this problem. To correct the problem, just cut off the
reversed plug and re-crimp a new one in the correct orientation. You
can also eliminate this problem by splitting the insulation on any
LocoNet cable and shorting the two center wires (red and green)
together. Make sure that the shorted wires continue through the
cable as before.
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