ACRO 51
3. Hold the transmitter sticks in the position that you want the
servos to assume during signal loss conditions. You can
determine fail-safe preset positions for the other channels by
placing the potentiometers and switches in the positions that you
want them to assume during interference.
4. With the sticks, switches and potentiometers in the fail-safe
positions, touch the CLR key. This will enter these locations as the
fail-safe memory settings. A high pitched beep will indicate that
this setting has been stored.
5. To confirm that the input of data was successful, switch the
transmitter OFF. The controls will move to the input locations. If
not, repeat step 4 again.
6. To exit the Fail-Safe Function, press the UP and DN keys
simultaneously.
Note: These preset positions remain stored in the transmitter’s
memory until both the transmitter battery pack and the lithium
back-up battery have been removed (or until data reset has been
performed). Therefore, you do not have to reset the fail-safe
each time you fly. Should you want to re-adjust the fail-safe
presets, access the Fail-Safe Function and adjust the presets as
you have just done. The transmitter automatically recalls the
settings for the last fail-safe adjustment.
Accessing the Fail-Safe/Hold Memory in S-PCM Modulation
Hold (S-PCM)
The Hold Function is automatically activated when the radio is
turned ON and in the S-PCM modulation.
This function stops (or holds) the servos in the positions they were
in just prior to the interference. Therefore, your airplane
maintains the position held immediately before the interference
was experienced. When a clear signal is restored, the Hold
Function releases, and control of the airplane returns to you.
1. Place the transmitter power switch in the ON (upper)
position.
2. While the power switch is in the ON position, press the UP
and DN keys simultaneously to access the Function Mode.
3. Press either the UP or DN key until Fail-Safe appears in the
left portion of your LCD.
Note: If Fail-Safe does not appear on your LCD, it is because
you are transmitting in PPM. Fail-Safe is not applicable in the
PPM mode. Refer to the Modulation Mode Selection Section for
more information.
Fail Safe/Hold Combination in S-PCM Modulation
The XP8103 allows you to combine the hold and fail-safe presets
for all eight (8) channels on the receiver — you can select fail-
safe or hold independently for all channels on your aircraft. In
other words, some channels will hold their last clear signal
position, while others assume the preset position. Once the fail-
safe has been activated by signal interruption (interference), the
transmitter automatically moves the servos to a preset position.
The predetermined servo positions are set by you. In the S-PCM
fail-safe, the time delay (the amount of time it takes, starting the
moment the interference occurs, until the servos assume the
preset positions) is fixed at .25, or 1/4, second.
After the interference has ceased, normal operation of the
airplane returns to you immediately.
4.14 Fail-Safe/Hold (Function Mode), cont.
