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Flight Log
The Spektrum Flight Log (SPM9540) is compatible with the AR7110/AR7110R
PowerSafe.
The Flight Log displays overall RF link performance as well as the individual
internal and external receiver link data. Additionally it displays receiver voltage.
Using the Flight Log
After a flight and before turning off the receiver or transmitter, plug the Flight Log
into the Data port on the PowerSafe. The screen will automatically display voltage
e.g. 6v2= 6.2 volts.
When the voltage reaches 4.8 volts or less, the screen will flash indicating low
voltage.
Press the button to display the following information:
A - Antenna fades on antenna A
L - Antenna fades on the left antenna
F - Frame loss
Antenna fades—represents the loss of a bit of information on that specific antenna.
Typically it' s normal to have as many as 50 to 100 antenna fades during a flight.
If any single antenna experiences over 500 fades in a single flight, the antenna
should be repositioned in the aircraft to optimize the RF link.
Frame loss—represents simultaneous antenna fades on all attached receivers. If
the RF link is performing optimally, frame losses per flight should be less than 20.
The antenna fades that caused the frame loss are recorded and will be added to the
total antenna fades.
A Hold occurs when 45 consecutive frame losses occur. This takes about one
second. If a hold occurs during a flight, it' s important to reevaluate the system,
moving the antennas to different locations and/or checking to be sure the
transmitter and receivers are all working correctly. The frame losses that led to the
hold are not added to the total frame losses.
A servo extension can be used to allow the Flight Log to more conveniently be
plugged in without having to remove the aircraft' s hatch or canopy. On some
models, the Flight Log can be plugged in, attached and left on the model using
double-sided tape. This is common with helicopters, mounting the Flight Log
conveniently to the side frame.
B - Antenna fades on antenna B
R - Antenna fades on the right antenna
H - Holds
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