Guests - If You want access to member only forums on HSO. You will gain access only when you sign-in or Sign-Up on HotSpotOutdoors.

It's easy - LOOK UPPER right menu.

Sign in to follow this  
Followers 0
SWMuskeye

Trolling motor and AM radio

8 posts in this topic

When I fish late I like to listen to the Twins while I chase the elusive exclusive Muskellion. But every time my foot hits that pedal I get a high pitched wheezing sound out of my radio speakers. I don't think that it happens when it plays a cd or fm. Is there anything I can do to block this interference? Its getting pretty annoying and I'm talking about more than Bert Blyleven's commentary.

Thanks!

-MB

Share this post


Link to post
Share on other sites

I have the same exact problem. I put up with it for 4 hours on opener while listening to the Wild in the playoffs, but man is that annoying. Now I only turn on the Twins when I am anchored. Anybody know a solution?

Share this post


Link to post
Share on other sites

Sounds like you need an RF filter.

The only other solution would be to get a portable radio that runs off alkaline batteries.

Go Twins! Go!

------------------
Good fishing,
UJ
unitedjigsticker@aol.com

[This message has been edited by united jigsticker (edited 07-31-2003).]

Share this post


Link to post
Share on other sites

If you are running a marine or automotive type head unit for a radio, there are interferance filters that plug in-line to the antenna cord (check radio shack). If the electrical systems are isolated, there shouldn't be any noise comming through the power system, then more than likely it is simple electro-mag interferance generated by the motor at the same frequency as the radio signal, or being inducted into the power cables, and there is not much you can do except tune into a different frequency or put up with it, short of sheilding the electrical systems, or perhaps an antenna booster?

Share this post


Link to post
Share on other sites

The best thing to do is to try and segregate the electrical systems the best you can. If possible try to place the batteries on opposite sides of the transom and run the wiring for the trolling motor on the opposite side of the boat that the radio and it's electrical is run(i.e. make sure the trolling motor wires do not come close to the radio and its supply cables). Make sure you tuck all the wires under the boat metal. RF fields are line of sight types of induced current. If you obstruct the line of sight with grounded shielding this eliminates much of the RF fields induced current. Trolling motors do not produce high RF fields therefore it sounds to me like some of the cabling are too close together or the batteries may be to close together. RF currents can back feed down the cable and cause havoc with many instruments. As stated before their are RF filters on the market that can be used but I would make sure you obstruct the line of sight and segregate cabling as much as possible. The fact that you are picking this up on AM frequencies and not FM is due to the frequency of the current being induced onto the ground or +12V power line of the radio. Also make sure the antenna is not close to the trolling motor wiring and make sure the trolling motor cables and wiring are NOT coiled. Coils produce greater EMF's and RF fields. Coiling wires produces an antenna for transmitting undesireable RF fields.
Hope this helps you out some.
Russ

Share this post


Link to post
Share on other sites

is the radio and trolling motor running off the same battery? if so, then the motor is creating the interference you hear. If you can get a separate smaller battery for the radio, it would eliminate it.

Comments from others?

-Catchin'

Share this post


Link to post
Share on other sites

The radio is running off my starting battery. The trolling motor has its own battery. Anyone else have suggestions?


Share this post


Link to post
Share on other sites

coldone hit it on the head. On the AM side of things you will get noise especially with a magnetic field caused by an electric motor running. AM is suseptable to all types of interference. Take a portable radio and move as far from the source of the noise as possible (while remaining on the boat of course)

chunky

Share this post


Link to post
Share on other sites
Guest
This topic is now closed to further replies.
Sign in to follow this  
Followers 0



  • Posts

    • I'm awesome at catching fish in the US. I leave Canada to those who are not so awesome at fishing.
    • I was at the fishing show & had talked with the Aqua Vu staff.  Their new HD cameras look amazing!  I thought the pictures on the AV760 was great, but these are super sharp. They also stated that you can view them clearly in the direct sun light.
    • The walleyes (current strong) I catch on Rainy fight harder than any bass I've ever caught. 
    • That's what happened when a mouse ran up Del's leg. He peed all over the carpet. 
    • cool info here....   http://files.dnr.state.mn.us/education_safety/safety/ice/ice_stats.pdf
    • Anyone fall thru the ice with a floating jacket or bibs? Any take on it? How about going thru WITHOUT floating jacket and pants? Any take on it? What if you fall in? What should you do if you fall through the ice? First, try not to panic. This may be easier said than done, unless you have worked out a survival plan in advance. Read through these steps so that you can be prepared. Don't remove your winter clothing. Heavy clothes won't drag you down, but instead can trap air to provide warmth and flotation. This is especially true with a snowmobile suit. Turn toward the direction you came. That’s probably the strongest ice. Place your hands and arms on the unbroken surface. This is where a pair of nails, sharpened screwdrivers or ice picks come in handy in
      providing the extra traction you need to pull yourself up onto the ice. Kick your feet and dig in your ice picks to work your way back onto the solid ice. If your clothes have trapped a lot of water, you may have to lift yourself partially out of the water on your elbows to let the water drain before starting forward. Lie flat on the ice once you are out and roll away from the hole to keep your weight spread out. This may help prevent you from breaking through again. Get to a warm, dry, sheltered area and re-warm yourself immediately. In moderate to severe cases of cold water hypothermia, you must seek medical attention. Cold blood trapped in your extremities can come rushing back to your heart after you begin to re-warm. The shock of the
      chilled blood may cause ventricular fibrillation leading to a heart attack and death! 
    • dont be surprised if ya catch a REB!!!!!!!!!!!!!!!!!
    • Well see their ya, go. Now fight that on a 26" rod. Can we both agree then that Walleye's can give up a little fight?
    • Here's a 12lber from this summer, though    
  • Our Sponsors