Spektrum AR7100 Series User Manual page 15

Advanced Range Testing Using a Flight Log (continued)
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.
Spektrum AR7100
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 e.g. 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.
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