X20/X20S and Ethos v1.0.11 User Manual
ACCST
The default alarms for ACCESS are 35 for 'RSSI Low' and 32 for 'RSSI Critical',
while for ACCST they are 45 and 42 respectively. Loss of control will happen
when the RSSI drops to around 28 for ACCESS and 38 for ACCST.
The warning for when telemetry is lost completely is announced as 'Telemetry Lost'.
Be aware that further alarms will NOT sound, because the telemetry link has failed,
and the radio can no longer warn you of an RSSI or any other alarm condition. In
this situation it is wise to turn back to investigate the problem.
Note that when the radio and receiver are too close (less than 1m) the receiver
may be swamped causing spurious alarms, resulting in an annoying "Telemetry
Lost" - "Telemetry Recovered" alarm loop.
VFR%
Prior to ACCESS V2.1, RSSI was based on a combination of received signal strength
and lost frame rate. Lost frames have now been removed from the RSSI
calculation, and added as a new sensor VFR% (Valid Frame Rate) to provide a
measure of Link Quality. At this stage there is no built in alert for VFR%, but you
can easily set one up as follows:
a) Set a Logical Switch to become True when VFR drops below say 80% (please
refer to the Logic Switches section):
b) Then create a Special Function to play the VFR value when the Logical Switch is
True (please refer to the Special Functions section):
RxBatt
Another standard internal sensor is the receiver battery voltage.
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