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Diffstat (limited to 'doc/telegps-system-operation.inc')
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diff --git a/doc/telegps-system-operation.inc b/doc/telegps-system-operation.inc new file mode 100644 index 00000000..c9fce7f0 --- /dev/null +++ b/doc/telegps-system-operation.inc @@ -0,0 +1,30 @@ +[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>>. |