I have a Hanger 9 AT-6. It flys with individual airleron servos. I am having a heck of a time getting rid of servo jitter. I have switched receivers, transmitters, batteries, and servos with no success. I tried installing an FMA noise trap, and a home built noise trap (based on the 74hco4 hex inverter) which helped but not enough. This evening I clearly established that the noise is coming from the airleron setup. When I disconnected the airleron wiring at the splitter the problem went away. When I attached any two servos and then moved them apart the jitters came back. Move them together again, jitters gone. Tested this several times. I had a similar problem with my Top Flight corsair and the flap servos which I solved by making the leads as short as possible. This is not an option in the AT-6 as they are as short as possible already.

The airleron servos are new Futaba s3003. The replacement servos tried were GWS. The radios tried are a Futaba super 7, and the old manual Futaba seven channel. The receivers tried are a FMA interceptor and the Futaba 127 7 channel FM.

Help!!

Can you set up the individual alieron servos on different channels? Also, use the heaviest gauge extensions you can find.

Andy

Try twisting the aileron servo wires (as well as the wires on the "Y" cord)

I run into this problem every one in a while and find that the "Y" connector I was using had a choke in line. Replace the "Y" connector with one without the choke and the problem will go away........

The 74HC04 (high speed CMOS) IC is good only up to 5 volts dc input. Higher than that and it may start to oscillate.

The 7404 (TTL) is good for up to 7 or 8 volts, if you really think you need to use an electronic Y.

Also, make sure the unused inputs are tied either high or low, or they too will jump all over the place.

Best bet is to hard wire the 2 servos together, no IC, no chokes.

Unfortunately I can't just split the servos to two different channels. Thanks for the suggestion.

Yep, I already tried twisting the leads. I also tried putting a capacitor between the signal and ground line. And tried different Y connectors.

Thanks for the suggestions.

I've ordered some servo wire and when it gets here I will hardwire everything together and we will see what happens. The only plug will be the connection to the receiver.

Thanks for the suggestion.

Try making a loop in one of the aileron servo leads if that doesn't work try adding an extension to just one of the servo leads. With your Y connector and equal length servo leads you in essence have a center feed di-pole antenna prone to picking up stray RF. Worth a try, good luck.

In the end I eliminated all connectors, Shortened the wiring as much as possible, hard wired through a noise trap built from plans on Tony Van Roon's web site, and plugged directly into the receiver. The last flight went perfectly! Thanks everyone for your ideas.