User Manual

IDLE-UP MIXER
This mixer is used to increase the idle slightly to help insure that the engine does not flame-out during spins and
other maneuvers that are performed at idle. The mix is turned on using the GEAR switch just after take-off and
turned off when it is time to land. The amount of Idle-Up (increase in RPM) can be adjusted from the front of
the TX to compensate for varying conditions without having to enter the program mix to make adjustments.
The mixer will use the Left Digital Flap Trim lever located next to the FLAP switch as the Master and the
Throttle channel as the Slave. The GEAR switch is used to turn the mixer on and off.
1. Select an unused Program Mixer (PROG MIX3, 4, 5, or 6)
2. Select LTRM as the Master.
3. Select THRO as the Slave.
4. Move the Left Flap Trim Digital Trim switch downward and hold it until it reaches its lower
limit
5. Highlight and select Offset and set the value to –200. This should represent the Flap Digital
Trim at its lowest setting which will cause the mixer to move only in 1 direction. This is to
guard against the mixer lowering the idle by mistake and causing a flame-out.
6. Select the GEAR switch as the switch to turn the mixer on and off.
7. Move the GEAR switch back and forth while observing the number directly to the right of the
program mix name in the upper left portion of the display. The number will change between 0
and 1 as the switch is moved back and forth. When the number is 0, the mixer is looking at the
Pos0 values (not programmed yet) and when it is 1, the mixer is looking at the Pos1 values (also
not programmed). Put the GEAR switch in the position where you want the Idle-Up to turn ON.
Look at the number directly to the right of the Program Mix name. If it is 0, highlight and select
Pos0 on the display. If it is 1, highlight and select Pos1 on the display.
8. With the GEAR switch still in the ON position, set the percentage to +15%. This will cause the
throttle channel to increase 15% from idle when the mixer is turned on and the Digital Flap
Trim is advanced upwards to full. If the Digital Flap Trim is lowered from full, say to ½, then
there will only be 7.5% added to the throttle. This allows adjustment of how much the engine
Idles-up when the mixer is turned on.
9. The mixer should be adjusted with the engine running and up to operating temperature. With a
helper securely holding the aircraft, start the engine and warm it up to normal operating
temperature. Make sure the Gear switch is in the OFF position so there is no Idle-Up at this
time. Also lower the throttle stick to the full Low position.
Access the TRVL.ADJ function and position the throttle trim lever in its center detent. With the
trim at center, adjust the travel of the throttle servo to achieve the lowest dependable idle for
landing. This is referred to as Low Idle and you should have to perform this adjustment only
once unless there are dramatic changes in atmosphere or a change to the mechanical portion of
the throttle linkage. Exit the TRVL ADJ function.
9303 Program Mix Examples 3