GRAUPNER HoTT SMART-BOX Manual page 7

Signal quallity (S-QUA): shows the signal quality in %
Receive performance (S-dBm): the receive performance is sent "live" to the SMART-BOX via the receiver's
downlink channel. Note: the receive performance is shown as a negative value, i.e. a value approaching
zero is the maximum (= best reception); the lower the value falls, the worse the receive performance.
This value is particularly important during the range-check procedure carried out before fl ying the model.
Please read the corresponding section in the RC system instructions relating to range-checking.
Carry out a range-check before every fl ight, simulating all servo movements which will occur in fl ight: the
range must be at least 50 m on the ground when the transmitter is set to range-check mode; to guarantee
safe fl ying, the value displayed under S-dBm in the DATAVIEW display should be at least -80 dBm. If the
value is lower (e.g. -85 dBm) you should not even consider fl ying your model: check the receiver installation
and the power supply systems in your model and radio control system.
When operating your model this value should not fall below -90 dBm. If it does, you should reduce the dis-
tance between yourself and the model. However, under normal circumstances the audible range warning
(see below) will be triggered before the value falls to this level, in order to ensure safe operations.
Signal strenght (S-STR): indicates the signal strenght in %.
An audible range warning (continuous beeping at one-second intervals) is always emitted as soon as the
receiver signal in the downlink channel falls to the pre-set threshold. Since the transmitter has a much higher
transmitting power than the receiver, it is still possible to operate the model safely, but in the interests of
security you should always reduce the distance to the model until the audible warning stops.
Receiver temperature (R-TEMP): it is important that the temperature of your receiver always stays within
the approved range under all fl ight conditions (ideally between 10 and 55°C; please refer to your RC system
instructions).
The limit values for receiver temperature which trigger a warning can be set in the RX SERVO TEST display
under ALARM TEMP+ (50 – 80°C) and ALARM TEMP- (-20 – +10°C).
If the receiver temperature rises above the maximum value or falls below the minimum, the unit generates an
audible warning (continuous beeping). At the same time all the Smartbox receiver displays show a fl ashing
"TEMP.E" at top right, and the parameter R-TEM is shown in inverse form in the receiver data display (RX
DATAVIEW).
Data packets (L PACK TIME): indicates the duration of signal loss of the longest data packet during trans-
mission from transmitter to receiver, stated in msec. In practice this equates to the longest period which the
RC system has spent in fail-safe mode.
Operating voltage (R-VOLT): it is essential to monitor the operating voltage of the receiver constantly. If it
is too low, you must never launch your model or continue fl ying it.
The receiver low voltage warning can be adjusted in the RX SERVO TEST display under ALARM VOLT; the
available range is 3.0 to 6.0 Volt. If battery voltage falls to the threshold level, an audible signal (continuous
beeping) is emitted, and "VOLT.E" fl ashes at top right in all the Smartbox receiver displays. At the same time
the parameter R-VOLT is shown in inverse form in the receiver data display (RX DATAVIEW).
Minimum operating voltage (L.R-VOLT): displays the lowest receiver operating voltage since the last time
the receiver was switched on. If this voltage differs signifi cantly from the actual operating voltage R-VOLT, it
is likely that the servos are placing an excessive load on the receiver battery, resulting in voltage collapses.
If this should occur, you should consider fi tting a larger or more robust receiver battery in order to obtain
maximum operating security.
Telemetry sensor 1 / 2 (SENSOR 1 / SENSOR 2): if these optional sensors are connected, their data
(Voltage / Volt and temperature / °C) is displayed live on the screen.
See also Chapter 4 - Telemetry displays.
06
33700 SMART-BOX - Graupner HoTT 2.4