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[appendix]
== Troubleshooting
=== Radio Signal Strength
Each unit in the TeleLaunch system has a debugging feature
that can be used to view the actual received radio signal
strength of each packet. To use this feature, connect to the
desired unit (TeleLCO is probably the most useful place to
start) with a laptop and terminal program as explained in the
configuration section of the manual. Then, you can enable
debug tracing using 'D 1' command.
Debug mode is fairly chatty, but each time the TeleLCO unit
queries the currently selected TeleFire unit for igniter
status, the return packet will print out the RSSI value.
RSSI is "received signal strength indicated" and is expressed
in decibel units relative to a milliwatt, or "dBm".
Observing the RSSI is a great way to compare antennas, antenna
mounting arrangements, and so forth with more granularity than
provided by the red/amber/green operational LED indicators.
The system is good down to about -100dBm, and it takes about
6dB to double the range. So a reading of -84dBm means that you
could extend the distance between the units by a factor of
10 before losing the link. Note, however, that real world
range is affected by terrain, vegetation, etc.
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