Goto 2.4ghz. i did an love it, no more pin boards, getting shot down. No more taxing out and getting the attena caught in the fence. The best part is if you turn the RX on and leave the TX off the servos set to failsafe not jump around

Any carbon fiber in the plane? You dont have one of those fancy models thats built up carbon-laminate-ply do you?
Cheers.

I don't think anything is in a bind. No 2.4 yet, but Joe Nall around the corner and it's starting to look better and better. No carbon fiber. I stopped messing with it around lunch, got alittle frustrated, so I took step back. I'm going to mess with it tonight, and try a few of the other suggestions I've gotten.

Houston I think we have found the problem the 2 JR 125's on elevator do not like being close together. I moved it outside of shop first to see if it was the my lights making them jump. They still jumped. I took Ken's advice and pulled everything out of plane, set it up on table and started one by one trying each servo. They all seemed fine till you get 2 of them close to each other, and they start dancing. Move them away from each other they work fine. I'm very scared of them now so going to change all the 125's out with some HS-5485's. Send 125's back to JR. They seem ok on the ailerons but I don't trust them now. Atleast she isn't jumping around like a possessed plane. Now I'm not getting all happy yet cause, I haven't run her up yet,but atleast jumping is gone.

Make double sure you resolved problem. I had a similar situation last week and thought it was fixed. Went two circuits around the lake and lost all response or it seemed like everything reversed. Unfortunately I was coming in for a landing and not high enough for a recovery. Totaled the plane.

Pretty interesting read on chokes and twisting cables here...
http://www.rcgroups.com/forums/showthread.php?t=416226

regards, Rich

Using chokes or twisting cables doesn't really come into play here on the size of planes we are talking about in the Beginner's forum. Chokes and twisting your wires comes into play when you start having long wire runs (usually over 2'-3' long) where the wire can pick up interence.

Ken

While you may well be correct, and you have tons more experience than I do......it costs nothing to twist some wires and observe if it helps. Who would reasonably believe that one particular brand of servos would show these symptoms, while others do not...all in the same small plane? regards (and I enjoyed reading your website! ) Rich

Not if they're Tower Pro MG995's. They can squeek and jitter at the drop of a hat.

He did say earlier that he was using 24 inch extensions. These, plus the original leads on the servos, can be detrimental.

I work as a designer of switch-mode power supplies. So fast rising current pulses and what-to-do about them are my bread and butter.
My boss used to say "Have Frequency, will travel" as a nod to a 50's cowboy TV series, but he's right. Steep edges have harmonic frequencies marching off into Poland.
Digital servos are characterised by having faster responses. This is achieved by using microprocessor controlled feedback along with very low resistance MOSFET drivers. The instantaneous current delivery can be an order of magnitude higher with a digital metal gear servo on 6V than with an analogue plastic gear servo on 4.8V. The significance of the metal gears is the increased moment of inertia and the much higher torque required to follow the "improved" position demand.
My suspicions would be that the pulse from the supply line to the servo is generating a signal in the signal wire, probably from magnetic cross-coupling. If that's the case, twisting may make things worse and ferrite will not help. In order to test my theory, you could separate the signal lead from the other 2 wires in the threesome. You may only need to move it a couple of mm. Of course if it works, you'll have spoiled the servo wire and if it doesn't work....well, you'll have spoiled the servo wire.

Lol!

Humorous analogy!

Ok we have a happy plane and happy electronics. I would like to know why the JR 125's jump around, but I'm not cutting anything up to try and figure it out. Here's what I ended up with (4) HS-5485 ailerons and elevator (1) JR 126 rudder (1) HS-425BB throttle. Thank all of you for your help

If you're happy-we're happy for you. Now go fly it.

Well done..this hobby is part skill; part electronics; part mechanics; part assembling; part sleuthing......and a whole lot of fun....

regards, Rich

And don't forget a little bit a magic, and a WHOLE LOT OF LUCK!!!!

Ken

Someone sent this link to me. http://www.rcuniverse.com/forum/m_54...tm.htm#5553062

I'm going to talk to LHS I got these servos from today see what they can do. I bought these servos Nov. of last year, seems they should have been pulled off the shelf a long time ago.