Radio System FAQ

9Z is the flagship of the Futaba line. What makes is such is its amazing flexibility. There is very little you CAN'T get a 9Z to do, if you know your way around the radio.

For the 8U and 9C, the link function is only a "link out" function—meaning that if mix 1 is set up, lets say, to mix rudder to elevator (to get rid of pitching when knife edge), and link is turned on, then the radio will say "Ok, mix from rudder to elevator AND if there are other mixes from elevator to other channels, also obey those" Now, if you're using 2 elevator servos, and the second servo is commanded by a mix, you sure as heck want link ON in this mix. If, however, you only have one elevator servo, and you have an elevator to flap mix and you DON'T want flap response from your rudder to elevator mix, you'd better leave link OFF.

Scenario 1:
I have a rudder to elevator mix to get rid of the airplane pitching to the belly when I'm knife edge. I also have 2 elevator servos, and am using pmix 1 to drive an elevator to ch 7 mix to command both elevator servos. I need link ON, or otherwise the rudder to elevator mix would only drive the servo plugged into the elevator channel.

Scenario 2:
I have the same rudder to elevator mix, but only one elevator channel, and an elevator to flap mix. I DON'T wan the rudder to elevator mix to then also command the flaps, so I want link OFF.

OK, so that's the "link out" function ... from this mix link OUT to other mixes.

The 9Z also has "link in". This means that if any other mix in the radio commands the master channel in this mix as a slave, then it should also follow through with this mix.

For example, you set up 9Z's standard elevator to flap mix. This mix doesn't have a choice to turn "link out" on in the prebuilt mix.

Now if you're using 2 flap servos and a mix to drive them both, you're going to darn well want that elevator to flap mix to command both flap servos and not just the one plugged into channel 6! By turning Link ON on the "in" side of the mix, you're telling the radio that any time you tell channel 6 to do something, also command this mix.

SCENARIO A:
built in elevator to flap mix, and flap servos plugged into 6 and 7, with pmix 1 being ch 6 to ch 7 to drive the 2 flap servos together. Link must be ON on the ch 6 side of the pmix 1 to make both flap servos obey the elevator to flap mix.

SCENARIO B:
built in elevator to flap mix, with a single flap channel (channel 6); pmix 1 is a flap to elevator mix. If link was ON at the master side, then the built in elevator to flap mix would then command flap to elevator, thus creating a continuous loop and a real mess! give elevator, mix gives flap, mixed flap gives elevator, mixed elevator gives flap, etc.....definite no no!

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