glitching
 

What causing glitching...

TX, RX, or the servos?

RE: glitching
 

Good question.
Here is my experience:
I bought a Hitec Mini6S for my Nexstar trying to save some money because it is tauted as extra long range, but it is a single conversion Rx. I had numerous glitches with it. I tried a buddy's SupremeIIs from Hitec which is a basic dual conversion Rx and bnever had a problem. I now own a SupremeIIs as well and have yet to have a glitch. I believe it comes down to an improper decoding of the signal coming from the Tx into the Rx. In the industrial world, you could think of this as not getting a verification from a checksum, but I am not sure how the radio industry communicates this info and if checksums are used.
I hope this offers some info.
Curtis

RE: glitching
 

You have not said what radio you have> glitches are caused by numerous things. You will have to be a bit more specific

RE: glitching
 

not much to be specific about. It is a no-name radio and no-name Rx and no-name servos in a $150 electric park flyer

RE: glitching
 

Is it on 27MHZ? I had a problem with a Parkzone Cub and a RC Car at the same time.

RE: glitching
 

If it's 27mhz, it could just be interference. That's a sorta generic frequency used by pretty much all cheap rc toys (both planes and cars), along with CB radios and a number of other devices. It's the free-for-all frequency.

RE: glitching
 

You will note that many of the common glitches on our planes come from the plane in self. A lot of electric planes have many problems with the noise of the motor and the energy modified by the esc, a ferrite donut can solve this problem with the esc, and placing the receiver far from the motor also relieves some of the interference. On Gas powered planes the engine could cause some interference so you have to place the receiver far from it. On helicopters loosen bolts cause interference. Some servos have to much noise and can cause an interference. I could name many other things that cause interferences, even on the proven new 2.4 Mhz radios. When building a model you have to be very careful to isolate the receiver, to extend the receiver antenna as straight as possible and always do a range check, preferable with the help of someone else who could grab the plane while you are moving the surfaces (90 feet away) and the most important think is to do it also with the engine at WOT so you can be sure that there will be no problems with the noise or vibration of the engine or motor.
I hope this could clarify something.

RE: glitching
 

it is 72mHz on Ch 16

RE: glitching
 

None of the above. Unless you have metal geared servos.

Glitching is caused by EMI - Electro-Magnetic Interference. By definition your own receiver and transmitter cannot "cause" it - only be affected by it. It can be caused by any broad-frequency spark like from a car's sparkplug, nearby high-tension power line or a large electric motor (garage door opener, drill, vacuum cleaner, car alternator, etc.). Two pieces of metal rubbing together inside the airframe from vibration can also cause glitching. That's why a lot of pilots won't fly metal-geared car servos.

RE: glitching
 

you really need to come forth with more info besides no name this that...we have no idea what you are calling a glitch.....you could be over driving the receiver, or the battery maybe low....if you want help then you have to help us understand what you are seeing

RE: glitching
 

Well...by no-name I mean there is no brand on the radio or the Rx.
In terms of what I am seeing, it is the servos suddenly moving (and move back) without any input. (Kind of like the plane has Parkinson disease)

RE: glitching
 

Sometimes the problem is low tech, like a cracked solder trace on the RX's power bus, or a cracked spot weld in a battery pack. Basically, anywhere human hands have been, you can have an intermittant flaw.

RE: glitching
 

does it still do this when you walk away a few feet, like 10? if not you could have been over driving your receiver

RE: glitching
 

What CP said!
Those intermittent buggers can make you crazy or crazier as it may be;) Being picky or being a good craftsman in radio installation can prevent a lot of problems. REALLY isolate the electric stuff from vibration. The softer the foam the better its shock absorbency qualities. Just think of the old school science experiment of dropping an egg in a container and trying to NOT break the egg.
I like to scavenge the foam packaging for electronic equipment. Make a block to fit into the fuse with a pocket for receiver or battery.

RE: glitching
 

Some other good points here. Always turn the Tx on before the Rx and always turn the Tx off after the Rx. The receiver looks for any signal and will accept the strongest. (OK - so the new 2.4 GHz get past that to some extent). And any time you're overly close it may cause the Parkinson's glitches you describe. As may low bettery voltage, EMI or a bad antenna or antenna connection. Do a range check (with an assistant or by watching the control sufaces carefully and see if it persists.

RE: glitching
 

I had a servo (a Futaba S148) that used to "twitch" like this alot. It was a little disconcerting..... I found out that if I was using a battery that was "close" to the 4.6V mark it would flip out OR if it was mounted NEAR the servo. I also found that the wiring in the unit was pretty twisted up (the "electronic spaghetti" look...). I took my time and a little scotch tape + zip-ties and made sure to put a good bit of distance between all the wires and tried to avoid any "snaggles" with some small diameter conduit.

It solved my problem with it. But then again, sometimes servos just twitch like a meth junky straight out of the box.... that's when you send it back for a new servo....... in my experience quality control at the factory can only go SO far (i'm an industrial mfg engineer and I can tell you that near the end of an 8hr shift, our quality issues CONSISTENTLY spiked due to worker fatigue) but MOSTLY b/c they just got SICK OF IT, started "clock watching", and really quit giving a hoot if it was correctly assembled or not! I imagine servo building is alot of AOS chinese mfg (AOS=*$$-on-stool mfg!)

Let me give you an example (and, by the way, this is TRUE!): You just went to a MAJOR dept store and spent $450 on a hot-snot brand new, shiny red lawnmower. You took it home, unpacked it, cranked it up, made a pass on your front lawn, and THEN noticed that something was "not quite right"..... yep, we ACTUALLY sent out NOT ONE, BUT MANY very well known and respected brand name mowers WITHOUT BLADES!!!!!!!!!!!!!!! I would have given $100 JUST to see the look on that guy's face when he realized that his BRAND NEW mower HAD NO BLADE!!!!!!!!!! [X(] I would have pee'd myself laughing! I almost cracked up when the plant manager went into an apoplectic rage during a meeting when HE found out about it! It was HYSTERICAL !!!!!!!!