Eagle Tree Pro, Glide, Flight and Boat Seagull Wireless Telemetry and Data Recorder - Manual (Page 8)

Copyright © 2003-2010 Eagle Tree Systems, LLC
Page 8
The secondary RPM channels are automatically set up with the same gear ratio as the primary RPM. The
secondary RPM sensor(s) are logged and displayed on the screens with the other parameters, as described below.
NOTE: When using secondary RPM sensors in any of the servo ports, servo port monitoring will not work correctly. It is
a good idea to select “Do not calibrate servos” in the New Model Wizard if you plan on using multiple RPMs.
NOTE: for the secondary RPM sensor to work, there has to be voltage from 4.5 to 6.5 V supplied to one or both of the
servo inputs (as shown in Figure 1). This is normally done with the Y Cables, a separate battery, or your BEC.
Powering the Recorder
IMPORTANT: If you are using the 1 Watt 900 MHz Telemetry Transmitter, special care must be given to ensure
that the supplied power remains between 5V and 5.75V. The 1 Watt Transmitter will stop transmitting if
powered above 5.75V, and will reduce power output to 500 mW (when in High Power mode) if the voltage drops
below 5V.
Also, if you are using the 2.4 GHz Telemetry Transmitter, special care must be given to ensure that the supplied
power remains between 4.35V and about 6.1V. The 2.4Ghz Transmitter will stop transmitting if powered above
about 6.1V.
First, determine if you wish to log servo positions. If you decide to log servo positions, you will be connecting the
Recorder to up to 4 of your receiver via the ‘Y’ cables. See the Advanced section for more information on servo
monitoring.
If you decide not to log servo positions (or have a Glide recorder without optional Y cables), you would normally still
power the Recorder from your receiver battery by connecting one of the Y cables from one of your receiver channels to
one of the Servo slots on the Recorder. You can either “Y in” to a used slot on your receiver, or just plug one end of
the Y cable into an empty receiver slot.
Note that for the Glide Recorder, the battery harness (cable with a Futaba style male connector on one end, and male
universal servo connector on the other end) is used to power the system. To power the system, plug the Futaba end into
any one of the recorder’s servo slots.
If you want to power the Recorder from a separate battery, meaning that you want complete electrical isolation between
the Recorder and your receiver, you can power the Recorder with a small 4.8v battery plugged into one of the servo slots.
Installing the Optional Battery Backup Harness
In most cases, the Recorder can be successfully powered by the Y cables from the receiver. If you have problems with
recorder power during acceleration or steering, as described in the troubleshooting section, this can be remedied by adding
a small backup battery to power the recorder. To add the backup battery, plug the larger end of the optional backup
harness into the recorder. The backup harness is a two wire cable with a Futaba style male connector on one end, and a
larger male connector on the other end. The large end of the backup harness plugs into the USB port of the recorder,
with the red wire in the same place as the red wire of the USB cable (as shown in the drawing).
The backup battery must be at least 4.5volts to power the recorder. Power is only drawn from the backup battery when
the voltage being supplied through the Y cables drops below the voltage of the backup battery, so if you use a 4.5 volt
backup battery, no power should be drawn from it except for moments when the main battery drops below this voltage.
Therefore, it is possible to use a very small pack (a tiny 4 cell pack or possibly 3 watch type batteries) as the backup
battery. Note of course that the backup battery must be disconnected whenever the receiver is turned off, as it will power
the recorder whenever power is not supplied to the recorder from the receiver. If you want to get fancy, you could add a
DPDT switch in place of the standard receiver switch and turn off the backup battery whenever you turn off the receiver.
Installing the Seagull Transmitter in your Vehicle