The Duplex system takes advantage of
the 2.4GHz band for communication. This system not only transmits
control data to the model but also sends data from the model back to the
transmitter. The telemetry data collected during operation is shown as
actual, measured values in real time on either LCD screen of a connected
JETIBOX or on the DC/DS JETI model transmitters.
MSPEED EX is a sensor which measures
the speed of a flying model through the air to provide the indicated
airspeed (IAS). The reporting of airspeed can be very instructive with
regard to the control of a flying model, for example allowing the pilot
to determine the model´s stall speed and set an alarm to indicate when
the model falls below this speed.
Another function of the sensor is to
allow the pilot to set a desired speed and a step above or below this
speed at which an acoustic signal should be sounded by the transmitter
module. To facilitate easier reading of the indicated airspeed, a bar
graph is displayed, marking the appropriate configured steps. The
measurement of airspeed is based on the principle of change in dynamic
pressure, measured by a Pitot tube, which is connected by silicon
tubing. With the help of the wireless Duplex system, this sensor
information can be reported to the pilot in realtime, allowing immediate
feedback in airspeed changes and a deviations from the configured
steps.