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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.