ferrite rings

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Arthur Fielding
Posts: 78
Joined: February 3rd, 2009, 8:18 pm

ferrite rings

Postby Arthur Fielding » October 27th, 2017, 9:27 pm

I would appreciate sum advise please
I have a power box ignition kill switch working with a OS 33 petrol engine , the engine has started to miss fire, and I notice the red ignition light goes out. Now as this unit works through the RX I believe it is picking up interference from the ignition unit( yes it is 2.4 meg) so I wont to fit a ferrite ring, my question is, what lead do I put it on ,the one from the ignition unit to the power box or the one from the power box to the RX?
Thanks for your time

Barrie King
Posts: 147
Joined: December 4th, 2008, 9:35 pm
Location: Retford, Notts

Re: ferrite rings

Postby Barrie King » October 28th, 2017, 10:54 am

Before going down the ferrite ring route I would check the plug lead for earth continuity, I have found in the past that any break in this area will give rise to Miss fires and radio glitches even on 2.4

Tony Collins 1073
Posts: 755
Joined: December 6th, 2008, 10:00 am
Location: Braintree. Many Miles from any "Large Model" club

Re: ferrite rings

Postby Tony Collins 1073 » October 28th, 2017, 1:05 pm

Hi Arthur. Although I have never used a powerbox kill switch, the reason for glitches is normally that RFI is getting back into the receiver through the powerbox to receiver signal lead. The normal procedure would be to place your ring on receiver plug lead close to the receiver. It won't hurt to put one on the ignition to powerbox lead close to the powerbox.
I personally think that a hex inverter which inverts the signal and then inverts it again and also boosts the receiver signal is a far better idea as eletronically it completely isolates the receiver from any RFI trying to get in. A simple 4069 hex inverter is all that is required. An even better way would be to use a mechanical switch. No connection to receiver and therefore no interference can get back in.
PS. You must also ask yourself why a system that was previously working OK has decided to play up.
HT lead/plug connection maybe.

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