GRAUPNER mc-18, Programming Manual

Page: 33 / 56

Code 98 Code 77
Operating Timer FAIL SAFE
Transmitter Operating Timer Programming the Fail Safe
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I N T E G . T 4 : 2 7 : 5 4
The operating timer displays the time the transmitter
has been switched on and monitors the transmitter
power supply.
After the batteries have been charged, could 98
should therefore be called and indicated time reset to
0 by pressing the
CLEAR key.
The operating time is then measured whilst the
transmitter power switch is on. This permits the
cumulative operating time to be displayed at any
moment by calling code 98.
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F A I L S A F E H O L D
This is possible only in PCM mode with mc-18
receivers.
The inherently higher operational reliability of Pulse
Code Modulation (PCM) as compared to the simpler
Pulse Position Modulation (PPM) results from the
ability of the micro-processor installed in the receiver
to recognise when a received signal has been
corrupted or stopped by outside interference.
In such cases, the receiver automatically replaces the
false signal with the last correctly received one stored
in the receiver. In this manner interference of short
duration will be eliminated.
In the case of longer lasting disturbance of the
transmissions, the operator may choose between two
options:
1. HOLD
The servos hold that position which corresponds to
the last correctly received signal, until the receiver
manages to receive a new intact signal again.
2. FAILSAFE
The servos move a pre-set position until an
acceptable signal is again received by the receiver.
The delay, determining the time from loss of signal to
the triggering of the fail-safe program, can be
adjusted in three steps (1.0s, 0.5s and 0.25s), to
allow for different model speeds.
After calling code 77, switching can be performed by
the
INC key between HOLD, FS 1.0s, FS 0.5s and
FS 0.25s. To record the positions for the servos the
control functions have to be moved to the required
positions at the transmitter, then press the
STORE
key. This step stores the current adjustments as the
fail-safe settings, which are transferred at regular
intervals to the receiver. The receiver stores these
fail-safe values for use in the case of signal loss.
Fail-safe adjustments can be overwritten at any time,
even in flight, by calling code 77 and changing the
current transmitter fail-safe data by pressing the
STORE key.