I've been working on a Nitro Predator for about a month and ahalf now. I'm stalled trying to figure out some problems with an Airtronics radio system I have that doesn't want to work. Everything "seems" OK but when I hook up servos to the receiver and try to control with the TX, no luck. the servos jitter when I apply power at the receiver, but no response at all to TX commands.

am playing with adding a controllable rudder to the Predator for no other reason than the real one has one. So, I'm making it more difficult, I know. I'll probably end up fixing the rudder, but its fun to play with.

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3D Robotics
Comment by Chris Anderson on March 10, 2008 at 5:30pm
Can you share of picture of your plane (inside and out)?

Moderator
Comment by Sgt Ric on March 10, 2008 at 6:12pm
Do the servos chatter differently when you turn on/off the TX?

We need to be sure the transmitter works, and is the same channel as the RX.

On the other hand, is the antenna on the RX intact?
.
Are you sure this is a working RC system, or is it second hand?
Comment by Ron Jacobs on March 11, 2008 at 9:54am
It is a used system.

I have found what appears to be the original channel/freq sticker under the red dot sticker with the number 14 written on it. The original sticker says 52.

Seems it might be possible the Tx is not "tuned to the channel 14 crystal?

The servos only chatter when I apply poser to the Rx. They do not respond other than this. I'll try to do a few more tests and post on them.

Will take a few pix as well. Not much to see right now, but I'll show you what I've got going.
Comment by Ron Jacobs on March 11, 2008 at 10:03am
Tx and Rx have same ch14 crystal.

Rx antenna appears to be intact.

At this point I am more sure it is a non-working system.

I'll post pix of the Tx and Rx as well.

The Rx has been modified. It has what looks like a second battery attachment cable installed. So it might be this system is hacked to death.

I also have a Futaba 6EXH/A Tx with no receiver on CH 26. Its much newer of course, maybe I'll get a futaba Rx and try that one. Only problem is it is for helicopter.

Is there a way without hooking up an Rx and servos to test a Tx?
Comment by Ron Jacobs on March 11, 2008 at 10:04am
"The servos only chatter when I apply poser to the Rx. They do not respond other than this. I'll try to do a few more tests and post on them."

That should be "...apply power..." not "...poser..." :)
Comment by Ron Jacobs on March 11, 2008 at 10:06am
JUst anote on the rudder.

I found that the rudder part was all ready to be made operational.

It was marked at thecut line and slitted for hinges already, so quite easy to do.

Moderator
Comment by Sgt Ric on March 11, 2008 at 12:27pm
The NitroPlanes Predator is already pretty tight on space, requiring miniservos, so adding a rudder might take some squeezing.
Don't know if you are adding any autopilot electronics, but it'll be a challenge.
Comment by Ron Jacobs on March 11, 2008 at 1:48pm
Yeah, I know. I didn't really think about that when I did it. My plan is to install the servo at the rear, just forward of the rudder itself. So, a short linkage and some longer wires and then see how the CG works out.

I plan to install an autopilot, hoping most of it fits in the nose.

Moderator
Comment by Sgt Ric on March 11, 2008 at 2:12pm
Here's Chris's post about "cramming" the nose of the Predator. (the balsa version, not the plastic/foam ones)

http://diydrones.com/profiles/blog/show?id=705844%3ABlogPost%3A764
Comment by Ron Jacobs on March 12, 2008 at 11:32am
Sorry, didn't get time last night to do pix of my Predator. Will try again tonight.

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