Am radios in tractors

Doversix · Dec 31, 2010

What is the best way to eliminate noise from the am
side of the radio? It also pickups the sound from amber warning light mounted for highway use. Any ideas to solve this problem?

LarryT · Dec 31, 2010

The only way is to either use resistor plugs and wires or Shielded plugs and wires like are used on aircraft. I have heard of a device called and RF filter that can be put onto the antenna at the radio but I have never used one so I really don't know how well they work. Check with a local commercial communications radio shop. They can most likely help you out. LarryT

Old Roy · Dec 31, 2010

I used to use a coax from a CB and use the middle wire as + directly to battery the ground shielding it eliminated most noise.

k6zrx · Dec 31, 2010

Use resistor type spark plugs, make sure all grounds are good, and that the shield on the coax is good and grounded both ends. I use Autolite plugs in my cars and there are several choices for resistor and non-resistor in several heat ranges for my MoPar flatheads.

Josh

rrlund · Dec 31, 2010

Hanging a sheet of steel over your plugs,wires and mag or distributor helps too. Back when I had one on an Oliver 77,I ran it with the side curtain off one time. Couldn't figure why the radio was so noisy. I put it back on and the noise went away. Somebody told me later on about hanging the steel sheet on them. Made total sense to me then.

rodm1 · Dec 31, 2010

(quoted from post at 13:07:53 12/31/10) Hanging a sheet of steel over your plugs,wires and mag or distributor helps too. Back when I had one on an Oliver 77,I ran it with the side curtain off one time. Couldn't figure why the radio was so noisy. I put it back on and the noise went away. Somebody told me later on about hanging the steel sheet on them. Made total sense to me then.

Tinfoil around plugs and wires can help to.

Tony in SD · Dec 31, 2010

if its a whining sound you can put an electrolytic capacitor across the neg and pos leads. a 1000uF @ 25 wdcv should work. If its the spark plug noises, in addition to the other posts, move the antenna as far away as possible from the noise producers. Also some radios, especially the older ones have a trim capacitor to fine tune the antenna. It is usually located near the antenna input. To tune the antenna set the radio to a lower numbered station, then hold the antenna and tune the capacitor for min sound. That will maximize the desired signal level.

Brad Gyde · Jan 1, 2011

If you're sure the noise is due to the light (which you seem that you are) then all the plugs and wires aren't gonna help squat..

I installed a cb in a 05 Ford diesel pickup about a year ago.. I got ALOT of interference when the truck was running.. I had a radio shop do a tweek and tune of the radio, and also installed a filter of some sort (would have to dig and see if I could find the receipt that detailed exactly what it was called) and although there is still some interference, there is far less now (before the work you'd have to run with the squelch turned nearly all the way "up", now, 1/8 to 1/4 turn will eliminate all my "running noise".

Since a CB uses am frequency also, I'd go to a reputable CB radio place and explain the scenario, and ask if they could help your situation..

Years ago, I was also told to hook a wire to the "box" of the cb, and run to a good ground.. That also helped with the interference in that case.

Good Luck,

Brad (former CB radio enthusiast)

buickanddeere · Jan 1, 2011

(quoted from post at 14:23:23 12/31/10) What is the best way to eliminate noise from the am
side of the radio? It also pickups the sound from amber warning light mounted for highway use. Any ideas to solve this problem?

Filter the power supply to the radio with a aftermarket "block". Many home alternator conversions lack the filter at the alternator.
Connections to chassis and power are vital. Direct from the battery is best with two wires and don't use a chassis return.
Antenna cable and mounting location will make or break the installation?
What kind of radio? Some are well shielded and filtered, some are junk.

Am radios in tractors

Doversix

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LarryT

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Old Roy

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k6zrx

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rrlund

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rodm1

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Tony in SD

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Brad Gyde

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buickanddeere

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