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  1. #11
    Member + Sewage's Avatar
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    @EIcojo
    TMC and TMCPro are broadcasted FM signals from
    radio stations which usually do the ordinary one
    too. they are sub-carried RDS signals, therefore your
    device needs an extra FM areal.

    but the variation in radio service quality regarding
    traffic information is generally the bottleneck for all
    devices depending on it. some stations send a signal
    only once an hour prior to the news.

    regards
    Damian
    Last edited by Sewage; 5th March 2011 at 07:23 PM.

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  3. #12
    Navigation software expert TMC is a piece of carp!
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    Giomen's Avatar
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    Quote Originally Posted by tli View Post
    GPS units do not have any transmitter--just a receiver for broadcast traffic info reception.
    Two version are possible at least.
    First, some device have access to online services by GSM network for traffic service (like in Russia above).
    Second, GSM network operator give phone motion monitoring to traffic service provider (like TOM-TOM).
    Last edited by Giomen; 8th March 2011 at 02:18 AM.

  4. #13
    Member + TMC is a piece of carp!TMC is a piece of carp! tli's Avatar
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    We're talking about Garmin PNDs--not smart phones with GPS capabilities and special downloaded apps. Most PNDs currently used on the road have no GSM capability--with the exception of maybe the Garmin Mobile devices. The traffic systems deployed currently in, at least, the US, Canada, Europe and Australia operate as Sewage described requiring an independent or integrated FM receiver in order for a Garmin PND to receive traffic info.

  5. #14
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    There is a differencial antene system. For best receiving values is important to let the wires in one line - on to the both side from center.

 

 

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