i have an old world engines expert radio that i am using on my trainer. last time i used it (3 years ago) it was fine, no glitches, interfereance, ect. i put new batteries in the rx and tx this morning, hook it all up, and now it is glitching and wont work properly. what is the most common cause for this kind of thing? i realy want to fly this thing again, and have to get it sorted by next weekend. any help would be much appreciated. thanks

What do you man by "glitching"? Do you mean servo jitter?

CGr

yes thats what i mean

I have eliminated this type of problem by replacing the On-Off switch. You can test for this by connecting the battery directly to the receiver, thus eliminating the switch.

Since you have new fully charged batteries the problem could be that you are swamping the rx with a strong signal. With the attena colapsed, stand back 15-20 feet from the rx and see if the rx stops glitching. Also you may want to send it in Radio South and have them give it a good going over considering its age.

Bruce

It could also be the pots on the servos are dirty. This will happen after long storage. Might clear up with a lot of servo movement. Good Luck, Dave

ok, plugged the battery straight into the receiver and turned the radio on, so for so good no jitters, but as soon is i start moving the sticks the jittering starts. so i moved back 20ft with the antenna down and now there is no signal at all, so i pull the antenna up move the sticks and the jittering starts again. i have no idea what is wrong, mabie its time for a new radio set?

If you get no radio reaction with the antenna down, then it fails the range check and my best suggestion here is DO NOT FLY that plane and, if it's within your budget, DO replace your radio. If you want recommendations, well, any of the 2.4Ghz series will do just fine. Since I am a Spektrum/Airtronics advocate, I would start with the Spektrum DX6i and the AR500 receiver. As for the Airtronics, well, a great bargain, at least over here in the US, is the RDS8000 radio.

Your servos may need to be worked, as pointed out by Dave in his reply, so once you do get your new radio, then plug everything in then work the servos for a while to get "the kinks" out.

Good luck.

CGr.

iv just spent the last 2hrs reading through old threads on here to try and get this sorted. i decided to take all the electronics out of the plane and test them on the bench, and guess what.. i get the same jittering on the bench, however each servo works fine on its own in each of the four channels, and they all work fine with each other aslong as they are not along side each in the receiver. anyone seen tiis b4?

Try draining the batteries a bit and try this over again. The big point you made earlier was that when you walked away from the plane, you said about 20 feet with the antenna all the way down, you lost reception. That concerns me, as it should you.

Draining the batteries a bit sometimes cures the servo jitter, but will do nothing for the range check.

CGr.

ok i will try that, how much range should i have? tre range thing concerns me as well, and i will test the range b4 i will do any flying (go for a walk up the street and see how far i get b4 it cuts out)

Lets apply some fault finding logic here:
Only one thing has changed since you last used the radio; the batteries and time.

<u>The Battery packs:</u>
What type and voltage battery pack did you use previously? NiCAD 4.8V, NimH 4.8V, Alkaline 1.5V cells, Lipo, etc,?
What type and brand of servo's are you using in your plane?

Another thing, 3 years of storage can affect the Tx and Rx electronics. Often corrosion can set in and you can have a "dry solder joint" or a corroded joint.

<u>Time:</u>
This willaffect the electronic hardware; corrosion, (dry Joints), the frequency crystal integrity, aerial connection intergrity and maybe a few others I've not thought of.

Stat at the Reciever. Its the most exposed electronic component and the most sensitive.
Open theReceiver and check for signs of white power on the solder connections. Yes, then your Rx is shot. It can be reworked and may be salvaged but I'd replace it. Other components could aslo be affected that may not be as visible.

Do the same for the Transmitter. Theres more electronis inside the Tx so be careful when opening it. Its out of warranty anyway so go ahead and check the circuit board for corrsion. Yes, then it could be serviced and re-used, alternativley replace it.

I've never seen or heard of servo's getting dirt inside causing glitches but anythings possible.

The other fault you could be experiencng is corrosio or a lose connection in the switch. Open this and check for any signs of lose connections or bad solder joints. Replace as a precaution.


let us know how you get on, then we can expand on the search for the fault</p>

dull batterys in the rx pack.. still got the jitters, im stumped[&o] i opened the receiver and it all looks good, opened what i could of the transmitter and in all looks good. i am useing a different battery pack to what i was 3 years ago, but its just one of them basic 4 AA packs for now. the servos im useing are the ones that come with the transmitter, which have expert s-25 on them, except for the throttle one, its a futaba s3003. i have tested all the servos in one of my r/c cars and they all work fine. any ideas?

I know you Aussies don;t play good rugby but I thought that reading was a basic skill:



Lets apply some fault finding logic here:
Onlytwo things has changed since you last used the radio; the batteries and time.

<u>The Battery packs:</u>
What type and voltage battery pack did you use previously? NiCAD 4.8V, NimH 4.8V, Alkaline 1.5V cells, Lipo, etc,?
What type and brand of servo's are you using in your plane?

Another thing, 3 years of storage can affect the Tx and Rx electronics. Often corrosion can set in and you can have a "dry solder joint" or a corroded joint.

<u>Time:</u>
This willaffect the electronic hardware; corrosion, (dry Joints), the frequency crystal integrity, aerial connection intergrity and maybe a few others I've not thought of.

Stat at the Reciever. Its the most exposed electronic component and the most sensitive.
Open theReceiver and check for signs of white power on the solder connections. Yes, then your Rx is shot. It can be reworked and may be salvaged but I'd replace it. Other components could aslo be affected that may not be as visible.

Do the same for the Transmitter. Theres more electronis inside the Tx so be careful when opening it. Its out of warranty anyway so go ahead and check the circuit board for corrsion. Yes, then it could be serviced and re-used, alternativley replace it.

I've never seen or heard of servo's getting dirt inside causing glitches but anythings possible.

The other fault you could be experiencng is corrosio or a lose connection in the switch. Open this and check for any signs of lose connections or bad solder joints. Replace as a precaution.


let us know how you get on, then we can expand on the search for the fault</p>

sorry did not see your post[&:], i just got done editing my last post to reply to yours aswell. sorry im not the fastest typer lol

as for the rugby, you guys can have it as far as im concerned. lets play AFL, NRL, or even cricket

Do your range check with the transmitter antenna all the way down and with the receiver antenna fully stretched out. Ummm.. the receiver antenna is about... about... 40 inches (about 100 cm) long I hope?

CGr

LOL

Take the issue step by step. I doubt range checking is goingto reveal anything but more data points are always helpful.

I suspect you could be having an overvoltage issue but it could also be a hardware issue ith intermittent contact. Hard to tell with glitching servo's

A club mate had a similar issue and he discovered that he had simplynot plug the battery into the switch securely. When he ran the engine the vibration was enough to cause intermittent contact.

I had a radio, Airtronics Vanguard 6 that I hadn't used in 3 years and when I turned it on everything worked ok except for the throttle was glitching. The problem was the channel reversing switch; I don't think its worth the money to send in because it is 25 years old like your Expert 7. I have too many radios as it is and I been switching all my planes to 2.4 Ghz.

so... after days of tinkering i recon my receiver is shot. so i am just going to buy a new one till i can afford a new radio, which leads me to my next question. can i just buy any old 4-6ch receiver?

can't help you with receiver choice but would like to know if it was corrosion on the Rx board?

this is something that concerns me because our flying field is close to the sea so our aircraft getsblasted with salty air everyday we fly.

nah could not see any signs of corrosion on it, i just think its just past its used by date

Here in the US Hitec makes a receiver (Supreme 8) that works with both positive and negative shift radios JR And Airtronics (Sanwa) or Futaba and Hitec. I do not know if its offered in Australia.