Spektrum AR7100
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Spektrum AR7100
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Advanced Range Testing Using a Flight Log (continued)
Advanced Range Testing Using a Flight Log (continued)
6. After one minute, a successful range check will have less than
ten recorded frame losses. Scrolling the Flight Log through the
antenna fades (A, B, R) allows you to evaluate the performance
of each receiver. Antenna fades should be relatively uniform. If a
specific antenna is experiencing a high degree of fades then that
antenna should be moved to a different location.
7. A successful advanced test will yield the following:
H - 0 holds
F - less than 10 frame losses
A, B, R, - Antenna fades will typically be less than 100. It’s
important to compare the relative antenna fades and if a particular
receiver has a significantly higher number of fades (2 to 3X) then the
test should be redone. If the same results occur, move the offending
receiver to a different location.
Flight Log (SPM9540 Optional)
The Flight Log is compatible with the AR7100/AR7100R. 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 AR7100/AR7100R. The
screen will automatically display voltage i.e. 6v2= 6.2 volts.
Note: 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 the internal antenna
B - Antenna fades on the left external antenna
L - Not used
R - Antenna fades on the right external if used
F - Frame loss
H - Holds
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. 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 evaluate the system, moving the
antennas to different locations and or checking to be sure the
transmitter and receivers are all working correctly.
Note: A servo extension can be used to allow the Flight Log to
be plugged in more conveniently without having to remove the
helicopter’s canopy. On some models, the Flight Log can be plugged
in, attached and left on the model using double-sided tape. Mounting
the Flight Log conveniently to the side frame is common with
helicopters.
