TOPIC:

Just building my Blitzer Beetle re release and have come up against something strange. i was hoping to use some radio gear i already had knocking about. I have a HPI TF3 27mhz am Transmitter that is coupled up with its correct RF3 receiver operating on a band 6 acoms crystals set. I was digging around and found an excellent Acoms AS-12 servo for the steering and am running the kit standard TEU 104 BK speed controller. I thought i had it all sorted until i assembled it and have tried the electronics and i am getting a very very slight jittering action from the steering servo that only occurs occasionaly but i cannot seem to eradicate it? it doesnt seem to be causing a problem but is bugging the badword out of me!!! not sure if its relevant but the jitter occurs mainly with the steering in the neutral position however when turning the steering slowly a definite shakeing action is present.....or am i just bieng over fussy

Radio gear is a complete grey area to me and i was hoping someone could offer an explanation do you think i need to run a HPI servo off it not Acoms?

Thanks in advance

I have come over this phenomen several times and it is usually down to bad servo sircut board inside the servo..

Only way to fix this is to buy a new servo, or test a spare one that you know works or last ask a friend to loan out his servo so you kan test..

The rule is ofthen, the cheaper the servo is, the more likely you are to have a servo that jitters...

I have tried two other acoms servo's and a Futuba servo too and they all have the same jitter? i have switched the receiver over for an acoms one and that eradicated 99% of the problem? not sure what to conclude from this.

Should i purchase a HPI servo in order to use this receiver (if so will a standard torque SF1 servo be sufficient for steering?)

HPI receivers dont seem to like Acoms or Futuba servo's? its not a massive problem as the jittering was only slight but was a little annoying and id like to know why it happens.

Regards

I'm not that good in english....

But you say the 99% of the jitter wanished when switched over to a Acoms receiver?

If that are the case I say just live with it, not much you can do about it..


And as you have found out some receivers don't other servoes and vica versa..
If I don't use my 2.4 system I run Traxxas receivers on most of my rigs and they seems to hook up weel with 99% of the servoes out there..

But the rest of the Traxxas radio system are rubbish imo

Servo jitter can be lots of things, 27MHz gear is prone to interference from metal-on-metal rubbing, just a screwdriver on a screw nearby will cause it. If you suspect it's more to do with the actual radio gear, try swapping servos, receivers, transmitters, crystals, batteries etc & see if swapping any one of these makes a difference. The most common cause of jitters that are actually to do with the servo itself, is the internal feedback/positioning potentiometer - these get dirty &/or worn & feedback a dirty 'current position' signal, the servo then moves to correct the position, & so on. If the problem occurs with any servo (& probably only on one channel) the problem is most likely a worn/dirty potentiometer in the gimble of the transmitter