Mixer for the JR PCM 10SX, SXII and 10X
Idle-Up is a very useful function for larger aircraft
because it allows you to set up a very slow idle to produce a breaking effect
for landing and at the flip of a switch provide a higher idle that is very dependable
for flying. It is especially useful in the thinner air of higher altitudes.
Our Idle-Up function will use the AUX5 knob/channel
to set how much the engine idle increases. PCM 10SXII and 10X
owners will use the Retract switch to turn Idle-Up on and off whereas PCM 10SX
owners will use the Brake switch. Actually, any of the available switches
can be used.
NOTE: It is very important that the
throttle linkage be Completely Free of binding and contain no slop for
the Idle-Up to work properly.
- PCM 10SXII and 10X owners
access code 17 and ensure he Aux5 knob is Active.
- Access an unused Program Mix, (code
- Touch 10 to select Aux5
as the Master and touch 1 to select channel 1 (throttle) as the Slave.
Now touch ENTER to get to the next display.
- Touch PAGE to get to the switch selection
display. PCM 10SXII and 10X owners touch SEL under GER or
GR to select the Retract Gear switch. PCM 10SX owners touch SEL under
SW until BRK appears under SW, and also touch SEL under MASTER until ORIG
- Now touch PAGE to get back to the first
display (SXII and 10X owners touch PAGE twice).
- Rotate the Aux5 knob all the
way Counter Clockwise and touch STORE under OFFSET. This should result
in an OFFSET percentage of approximately -86%. This offset will limit
the Aux5 knob so that it can only increase the idle and not decrease
it. It will safeguard against accidentally killing the engine by switching
- Flip your new Idle-Up switch back and
forth and notice the display changing from POS-0 to POS-1 just above the
- Position your Idle-Up switch in the
position (forward or back) where you would like the Idle-Up to be turned
"ON". Touch the + key until the percentage is 10%. This
represents the total percentage that will be mixed into the throttle when
the Idle-Up switch is turned on and the Aux5 knob is rotated
- Turn the transmitter and
receiver ON. Rotate the Aux5 knob fully clockwise. Flip
the Idle-Up switch on and off and check to make sure the throttle is moving
in the correct direction. It should move towards the high throttle direction
when turned "ON". If it is moving in the wrong direction,
touch TURN under the percentages to change the percentage from positive
to negative while the switch is in the ON position. Check the direction
again with the knob still fully clockwise.
- Make these final adjustments with
the engine running. Rotate the Aux5 knob fully Counter Clockwise
and set the Idle-Up switch to OFF. Start the engine and get it up to
- Access TRAVEL code 12 (10X
owners touch ) and position the throttle trim lever in its center detent.
If the engine idle gets too low and the engine quits when the trim lever
is positioned in the center, touch the "–" key under THRO to reduce
the throw on the low-end until the engine does not die with the trim in
its center detent.
- Making sure the engine stays up to temperature,
adjust the low end travel using the + and – keys under THRO until you get
the lowest dependable idle with the throttle trim in it’s
center detent position.
- Now turn on the Idle-Up
using your Idle-Up switch and slowly turn the Aux5 knob Clockwise
to get the desired RPM increase (if the Aux5 Knob is too sensitive or insensitive,
go back into the program mix and adjust the mix percentage down or up respectively).
Don't set the Idle-Up too high, or you may not be able to enter a spin but
make sure it is set high enough so that the engine does not quit during
- Once you have the correct
amount of Idle-Up, kill the engine and inspect the throttle linkage
to ensure that the addition of throttle for Idle-Up does not stall the throttle
servo at the high-throttle position. Advance the throttle stick to full
high and turn on the Idle-Up. If the throttle servo is trying to drive
the carb past full open and/or the throttle servo is buzzing, access TRAVEL
code 12, (PCM 10X owners touch ) and touch the “-“ key until the throttle servo
is not trying to drive the carb past full open when the throttle stick is
in the full high position.
- Using the Idle-Up. Prior
to your take-off roll or just after take-off, turn the Idle-Up on. Turn
the Idle-Up off when you are ready to enter the landing pattern.
Sometimes the engine will be hotter/leaner at the
end of the flight and the idle will be too high or too low with Idle-Up turned
off. If this happens, keep the throttle trim lever in its center detent position
and readjust the low-end travel (code 12) for the lowest dependable
idle right after landing when the engine is still hot. The low-idle
should be adjusted to provide the lowest dependable idle for landing
at the end of the flight rather than for taxi and take-off at the beginning
of the flight. You should be able to turn the Idle-Up off at the end of a flight
and have confidence that the engine is running slow enough to provide good braking
affect without quitting.
You may find that on some days the
idle is too fast or too slow with the trim lever in its center detent (air changes
& pushrods sometimes expand/contract). You can adjust the low-end travel
in function 12, or, you can just move the throttle trim lever off center
a few clicks and leave it there after the engine is warmed-up to operating temperature.
The Idle-Up will increase RPMs from whatever point the throttle trim lever is
set. Normally, once you have the Aux5 knob set for the desired increase
in RPM, it does not require further adjustment provided that the low-idle is
set properly. Remember to turn Idle-Up OFF before attempting to land or you
may sail right on by!