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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>>.
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