ht lead sheilding

[paul bradberry]

Hello Tony/John
The ferrite ring is plugged directly into the receiver ,This morning i changed the throttle servo ,The throttle servo plus the rudder servo are twitching it looks like i will have to go down the inverter root thanks for the diagram Tony this is really doin my head in.
Regards
Paul

[Tony Collins 1073]

Paul you really should not be getting that much interference with a standard Zenoah ignition.
Earlier on, Dave Hayfield suggested checking that you have the correct spark plug. Did you do that?
The plug should be of the resistor type. A standard non resistor plug WILL give you the trouble that you have at the moment. If you have a multimeter you should measure the resistance between the plug top and the centre electrode.
[Clean a spot on the electrode first] Ideally you should read several k/ohms, even 10kohms is ok. if you read less than 5 or 6 k/ohms it is too low and could give you trouble.

Good luck
Tony.

[paul bradberry]

Paul you really should not be getting that much interference with a standard Zenoah ignition.
Earlier on, Dave Hayfield suggested checking that you have the correct spark plug. Did you do that?
The plug should be of the resistor type. A standard non resistor plug WILL give you the trouble that you have at the moment. If you have a multimeter you should measure the resistance between the plug top and the centre electrode.
[Clean a spot on the electrode first] Ideally you should read several k/ohms, even 10kohms is ok. if you read less than 5 or 6 k/ohms it is too low and could give you trouble.

Good luck
Tony.

Tony It is the correct spark plug for the engine which is a resistor type.I am getting a reading of 9.7kohms on the plug.
Paul

[paul bradberry]

Paul you really should not be getting that much interference with a standard Zenoah ignition.
Earlier on, Dave Hayfield suggested checking that you have the correct spark plug. Did you do that?
The plug should be of the resistor type. A standard non resistor plug WILL give you the trouble that you have at the moment. If you have a multimeter you should measure the resistance between the plug top and the centre electrode.
[Clean a spot on the electrode first] Ideally you should read several k/ohms, even 10kohms is ok. if you read less than 5 or 6 k/ohms it is too low and could give you trouble.

Good luck
Tony.

Tony It is the correct spark plug for the engine which is a resistor type.I am getting a reading of 9.7kohms on the plug.
Paul

Fitted a different receiver/crystal still the same results

[Chris Lane]

Great! thanks Tony. Chris

[Tony Collins 1073]

Hi Dave
The problem i have is only appearing on the throttle servo which is located on the bulkhead behind the engine,The engine is a z26 when it is running and i perform a range check i can only walk away approx ten feet and the throttle servo starts jumping i have tried changing the servo/leads all to no avail,I have az23 which already had sheilding i fitted this to the 26 and the interference stopped?. Regards
Paul

Just been going back through your posts Paul. Why not just do to the Z26 what you have on the Z23. I assume that is a standard magneto ignition. If the problem is still there it must be the mag coils at fault.