Radio interference suppression?

[Cruisers460]

I think this is for radio interference suppression. It is labeled "Searanger" and is hooked from the alternator to the engine block. I assume that it was used for the original radio years ago. With the new radio that I bought would such a device be needed anymore?
Thanks, Bruce

 

[dchris]

Re: Radio interference suppression?

It looks like a big capacitor. You can probably remove it and see how your radio does. You can certainly get a smaller filter now days.

 

[Cruisers460]

Re: Radio interference suppression?

Certainly does look like a capacitor.

 

[wire2]

Re: Radio interference suppression?

Yes, it's an electrolytic capacitor. Strictly for DC. There will be a voltage and microfarad rating printed on the side. There's usually a red dot and a + sign beside the positive screw post.

 

[Boatist]

Re: Radio interference suppression?

In the old days they used a FEED THRU CAPACITOR and it was good for taking out spark noise and generator whine.

 

[Cruisers460]

Re: Radio interference suppression?

Thanks, thats what I thought it was, same question though; is it of any use with modern electronics?

 

[bruceb58]

Re: Radio interference suppression?

Depends on how much noise your alternator puts out and the quality of the design of the radio.

 

[bruceb58]

Re: Radio interference suppression?

deleted.

 

[Boatist]

Re: Radio interference suppression?

Cruisers
The old feed capacitors had more effect on AM type radios like a CB.
I am not sure if your talking about VHF marine or a AM/FM/CD radio.
In general VHF Marine and FM Radios which are both FM modulation are not effected very much by spark noise or gererator whine. It may have some effect on very very weak signals. Also spark plugs today are useally resistor plugs and have radio suppression carbon wire. No more Generators and Alternators do not create as much noise.

 

[Cruisers460]

Re: Radio interference suppression?

Thanks Boatist, I took it off Tuesday and went to the lake for a couple of days. No radio traffic but listening to NOAA with the engine running it had no effect with it gone. The first owner was a short wave fan, I'm guessing that was why it was there. I'll never use anything beyond the standard marine radio so I'm safe without it! Thanks for the advice all.