Supressing a cool box

[Colin_S]

I've got a 12v portable cool box that we plug into a cigarete lighter type socket on my friends fishing boat but I've noticed that it interferes with the VHF (buzzing sound when receiving transmissions). The box has got a fan and I guess that's what's causing the interference. Has anyone else had this sort of problem and found a way of suppressing the offending item.

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[Spuddy]

usual way is to solder a small value capacitor across the terminals of the motor.
Sorry, can't suggest a value for it but my references are at work and I'm not going there for ages. I know it isn't an electrolytic.
Try a Maplin shop if no-one else comes through on here.
regards, spuddy.

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[Colin_S]

That's what I was thinking, with memories of my first cars where radios where add ons and included fitting supressors to everything.

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[john_morris_uk]

Try 0.1 or 0.01 microfarad disc 50v. Keep the wires to the capacitor as short as possible.

<hr width=100% size=1><P ID="edit"><FONT SIZE=-1>Edited by john_morris_uk on 25/07/2004 22:03 (server time).</FONT></P>

 

[Colin_S]

Cheers John, I'll give that a go.
Off to post in the wanted section now ~~~

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[ayms]

I tried fixing a similar problem to this using a ferrite choke purchased from maplins based on a post about a month ago.

Tried it out this weekend but it didn't work. I'm taking the choke back to change for a smaller one as it was too large in diameter, fingers crossed.

Is this all a waste of time, should I be trying your method ?

<hr width=100% size=1>Doing the Arc ? Me to on http:// www.makathea.co.uk