Question about GPS

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I have an AirMap 600c GPS which causes bad interference on my airplane radio when a power cord is used to a cigar lighter outlet on the GPS

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  • wesfelty Oct 01, 2009

    I?ve been in electronics since 1955. At the age of 13, I was a radio/TV repairman. I built my first computer in 1958. I have a BS and MS degree in Physics which included a lot of electronics. I taught Physics and Electronics for 38 years. I have never in my life received as stupid an answer as I did from your ?GURU?. This sounds like an answer that I would expect from a 30 year ago AI program like Lisa. You charge people for answers like this? That is fraud! I expected to get an answer from a Lowrance AirMap tech.

    In case you can?t figurer it out ?
    ?Put in a resistor or capacitor? ? just any old resistor or capacitor? A resistor would do nothing for RF interference and a capacitor in series with a power lead. A capacitor is an AC not a DC device. It would act as an open circuit. That would ?fix the problem? by disconnecting the power lead. A capacitor can also be used to store power as with a photoflash, but that is in parallel, not serial and not applicable here.

    ?a fuse? ? that should act as if it weren?t even there unless too much current went through the power lead, also not applicable here.

    ?to lower the frequency amps? ? What the heck? This doesn?t even raise to the level of ?techno babble?. What the heck is that? ?Frequency? and ?amps? have nothing to do with each other.

    I?ve receive better ?answers? from ?computer service? people in India who didn?t speak English on computer questions. This ?answer? was nothing more than a half dozen electronic terms strung together.

  • wesfelty Oct 01, 2009

    What is this? I need to cut another hole in my instrument panel? And shorter cords, not longer cords are recommended to lower interference! If the power cord is acting as an antenna, it should be shorter.
    I have relocated the radio as far as possible from the GPS with no improvement.
    What is this? These "solutions" are silly at best. Is there anyone who knows anything?

  • wesfelty Oct 01, 2009

    Thanks for the reply. Yous was the only reply that made any sense. I can't believe the incompetence of the other two answers. "Put a capacitor" in series in the power lead to reduce the frequency! The capacitor would just cause an open circuit and what is the frequency of DC? Zero And, the other response to increase the length of the power cord, you try to reduce interference with shorter cords. I have never seen such incompetence passing itself as "guru".



    -Wes

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I have the same air-map 600c which I had it upgrade from an old model 500. I don't have any problems with mine but 4 of my friends also has the 600c although 2 out of 4 of my flying Buddy's did have the same problems with theirs so they return the unit and got a new one, One of them his problems is no longer an issue although the others still have the same problems. we all have the same radios in our aircraft so we cant figure it why some cause interference and some don't. See if you can take the unit back and do an exchange that might solved the problems if not, that something I doubt we going to solve beside changing AC radio. good luck

Posted on Oct 01, 2009

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Try shifting the cigar lighter outlet away from the radio and use a longer cord to charge the GPS.

Posted on Oct 01, 2009

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You may be able to cut a piece of the wiring out and install a or resistor or capacitor or fuse to lower the frequency amps that is causing the interference.

Posted on Oct 01, 2009

  • Nate Stansfield
    Nate Stansfield Oct 01, 2009

    The longer the wire the better.
    I am telling you to put a capacitor or resistor in the wiring from the power outlet to lower the frequency. The farthest away the components are from power source, the better.


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Hello kdiltzbook,

Most GPS units can be charged three different ways:

1. Connection to a computer via USB port
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3. Connection to a wall outlet via an AC adapter

Typically most GPS devices these days include only the USB cord. Some GPS units also include the cigarette lighter plug. For most GPS units the cigarette lighter plug and AC adapter are optional accessories have to be purchased in addition to the GPS.

You don't mention which model of Magellan GPS you have so I am not sure which cords your GPS should have included. It sounds like you have the cigarette lighter cord and the USB cord? I am sure that Magellan has an AC adapter available for your GPS. You will want to contact them directly (their website is http://www.magellangps.com) or visit an electronics store that sells Magellan GPS receivers (such as Best Buy™) to purchase the adapter.

However, most GPS receivers can be charged from the USB programming cord on the computer. However, ensure you are plugging the cord directly into a USB 2.0 on the computer itself NOT a port on a USB hub. (A USB hub may not output enough power to actually power and charge the GPS.)

You will also want to check and replace the fuse on the automobile plug.

I believe that both the USB and automobile cords should be charging the GPS. If neither adapter is charging the unit then the problem may be the GPS unit itself. The GPS may have a bad battery or problem with its charge circuitry. If that’s the case the unit may require factory service as the battery pack is generally not considered to be end user replaceable.


Best Regards,
Ken
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