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[dhb141]

Hi,

I have an old 2 channel Sanwa Dash RC system which I’ve been using on a converted Seaport tug.   Just recently the rudder servo has started to, what I can only describe as ‘chatter’ when I switch on, even though I’m not touching the controls - moving the rudder slightly from side to side.    I’m a complete dumb brain when it comes to electronics so I’d be grateful if anyone can enlighten me as to what’s going on!   Thanks in anticipation.

[malcolmfrary]

Either the servo has developed an internal fault, in which case it will require mending with a new one, or part of your wiring path between battery and the insides of the servo has grown a bit of black wire or if its a separate battery for the RX, the RX battery has gone a bit wonky on you.  The last could be a dud cell, or a bad connection.

[Netleyned]

If you switch your transmitter on first you should be OK.
If you switch the receiver on first it is looking for a signal
and sends spurious signals to the servo.

Ned

[dhb141]

Hi,

Thanks to you both for your replies.   I won't be able to try out your suggestions until tomorrow and then I'll let you know what happens when I do.   Very grateful for your help.

[tigertiger]

If neither of the above.I think I read somewhere about interference from other sources may cause this.
Could be a walkie talkie, microwave, or something else like a domestic wiring ring acting as an antenna, causing a problem.
A change location would  solve this.

[dhb141]

Thanks to all three of you all is now ok.   I think the problem was a bit of everything you suggested because checking the connections (one a bit loose), re-routing the aerial (it had got tangled up) and moving the tug to a different room to try it out has cured the 'chattering'.   Thanks again for all your help - it's very much appreciated.