I-23
Flight Log—Optional for JR R1221 Receiver
Using the Flight Log
Press the button to display the following information:
• A - Antenna fades on internal antenna A
• B - Antenna fades on external antenna B
• L - Antenna fades on the left external antenna
• R - Antenna fades on the right external antenna
• 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 that 20.
Holds are indicated when 45 consecutive (one right after the
other) frame losses occur.
This takes about one second. If a hold occurs during a flight,
it’s important to re-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 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.
The Flight Log is compatible with JR R1221 receivers. The
Flight Log displays overall RF link performance as well as the
individual internal and external receiver link data. Additionally it
displays receiver voltage.
After a flight and before turning off the receiver or transmitter,
plug the Flight Log into the Data port on the JR R1221
receiver. 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.
JRPA145