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+[appendix]
+== TeleGPS System Operation
+
+	=== GFSK Telemetry
+
+		TeleGPS's native telemetry system doesn't use a
+		'normal packet radio' mode like APRS because it's not
+		very efficient.  The GFSK modulation we use is FSK
+		with the base-band pulses passed through a Gaussian
+		filter before they go into the modulator to limit the
+		transmitted bandwidth.  When combined with forward
+		error correction and interleaving, this allows us to
+		have a very robust 19.2 kilobit data link with only
+		10-40 milliwatts of transmit power, a whip antenna in
+		the rocket, and a hand-held Yagi on the ground.  We've
+		had flights to above 21k feet AGL with great
+		reception, and calculations suggest we should be good
+		to well over 40k feet AGL with a 5-element yagi on the
+		ground with our 10mW units and over 100k feet AGL with
+		the 40mW devices.
+      
+	:aprsdevices: TeleGPS
+	:configure_section: _configure_device
+	include::aprs-operation.raw[]
+
+	=== Configurable Parameters
+
+        Configuring TeleGPS is very simple; the few configurable
+        parameters can all be set using the TeleGPS application over
+        USB. Check out <<_configure_device>>.