Lemon Microbrick Reference Guide
Page 7 of 20
With stabilization ON, pots centered, and Master Gain (if available) also centred, move the receiver sharply in all
three axes (roll, pitch, yaw) and you should see each of the servos respond, even if only slightly. The channel 6
servo may not move until you have done the advanced configuration.
5. Mount the receiver in the plane
If you plan to use stabilization, install the Microbrick flat in the fuselage (right side up or inverted), aligned with
the centerline and with the pins/connector pads at either back or front. If not using stabilization, orientation is
not critical, as long as the onboard servos can drive the control surfaces.
The Microbrick, particularly in stabilized use, must be mounted firmly to the aircraft. It is important that the
receiver NOT be free to move as it will respond to any displacement as though that were a movement of the
plane. A shifting receiver will also cause unwanted movement of the control surfaces, even without stabilization,
as the control rods shift.
There are two holes in the circuit board intended to facilitate screwing the receiver to the airframe. Do not use
glue or double-sided tape for attachment unless you take precautions to protect the secondary circuit board on
the bottom. See Annex A for suggestions.
Ensure that the active portion of the antenna (the silver section about 31mm long) is well separated from any
substantial metal item like a LiPo battery or wiring. Take care not to kink the antenna.
Make sure you can access the three gain pots on the receiver, as you will need to adjust them, perhaps
repeatedly. Also, make sure the bind button is accessible.
6. Set up servos
Power on. If stabilization is enabled, use the channel 5 switch to turn the stabilizer OFF (both green and red LEDs
ON).
1. If you have not already done so, adjust transmitter reversing so that all servos work in the correct direction
in response to the sticks.
2. With trims in neutral, adjust servo arms and linkages to align your control surfaces. Use only a minimum of
sub trim on the transmitter for fine tuning. Servo arms should be at right angles to push rods to ensure equal
movement in both directions.
3. With end points (limits) and control rates at 100%, check that control surface throws are at the
recommended maximums for the model and adjust linkages if necessary.
Note when using stabilization: Adjusting throws in the transmitter does not affect stabilization servo reaction, so
throws need to be set mechanically to give the stabilizer an appropriate amount of control; the exact amount is
not critical, as gain will later be used to adjust stabilization response.
7. Set dual rates and expo in the transmitter
A good starting point for D/R is to set High Rate at 100% and Low Rate at 65-75% for each axis.
Set expo to suit.
Expo of 20-25% softens response around neutral and can make smooth flying easier.
Stabilization settings also affect the response of the model to the transmitter sticks, typically reducing sensitivity
with an expo-like effect. So, if you are using stabilization, you may want to adjust your rates and expo once you
find out how the model reacts.
Note that the dual rate and expo settings determine stick response but don’t affect how stabilization works. That
is entirely done within the receiver.
