8
Receiver Installation and Transmitter Requirements
11)
The radio receiver should now be installed in the space next to the Naza Lite. It needs a minimum of
five channels, and it must have a failsafe system which restores the controls to preset positions if the
radio signal is lost. Most modern ones have this. The associated transmitter must have a Channel 5
switch
with adjustable endpoints
. The switch should preferably have a centre position as well. It is
used to select various flight modes provided by the Naza Lite, and the channel position for each mode
has to be set quite precisely using the endpoint adjustments. This is because failure to hit the correct
spot for the selected mode will be interpreted by the Naza as a loss of radio signal, and the device will
enter its failsafe mode.
Unfortunately this requirement rules out the majority of low cost 5-channel transmitters such as the
Spektrum DX5e and the Snelflight RC system. The Spektrum DX6i can be used, as can most
"computer" radios. Alternatively, Snelflight offers our "Ghost" 6-channel radio system designed
especially for Naza-based multirotors. It has a three-position channel 5 switch pre-calibrated to work
with the Naza Lite, and a self-centring throttle joystick which is ideal for used with the Naza Lite's
barometric height control system. The transmitter also has a rotary control assigned to channel 6,
which can be used for adjusting extra equipment such as a camera gimbal.
The receiver will be connected to the 3-pin sockets at the rear of the Naza Lite, using the twisted-wire
cables provided. It needs to be positioned so that the wires reach neatly, so it is a good idea to
experiment before fixing the receiver to the platform using the black double-sided foam pad provided.
If the receiver is a small one then the pad may need to be cut down to size. When positioning the
receiver, keep in mind the antenna(s). In most instances the antenna will exit towards the front, and the
connections will be at the rear.
When connecting to the Naza Lite, the
orange
wires (which carry the control signals) should be at the
bottom. On the Snelflight Spektrum receiver the orange wires should be uppermost. On the "Ghost"
receiver the orange wires should be oriented forwards towards the circuit board. After installation, tidy
up the wiring using a cable tie (Photo 13).
It is important to plug each receiver channel to the correct connector on the Naza Lite. The
connectors are labelled as follows:
A…..Aileron
E…...Elevator
T.......Throttle
R…...Rudder
U…...Mode switch.
Many receivers have the channels named in a similar way. If the channels on the receiver are
numbered instead, then it should be connected up according to Table 1 below. Other brands can be
used - Step 19 provides details of how to find out the correct connections.
13
