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Thread: XM Sat Radio for your carputer

  1. #71
    Join Date
    Oct 2003
    Just some general XM and PCR information....


    The antenna that comes with the PCR is known as the Delphi Home Antenna. Its a directional antenna (well about 40). While it does seem to work well in the car, you will get far more dropouts than you would with a car antenna.

    For car use it is best to use a omni-directional antenna such as this one: Its slightly smaller than a book of matches with a magnetic base for mounting. The cable is extremely thin so it can be easily run under door trims, seals, etc... to get outside of the car. And like all car antennas they are designed to use your car's roof. Some do put them on the dash or in the rear window, but for absolute best performance they should be put on your roof.

    There are 2 types of antennas. Single lead and dual lead. Dual lead antennas put the satellite and terrestrial repeater signals down 2 different wires and connectors. Single lead antennas put both signals down a single wire and connector. Dual lead antennas are being phased out in favor of single lead, only old XM hardware will use dual lead.

    All single lead antennas can be used with ANY single lead XM receiver.

    Single lead antennas CANNOT be used with a dual lead receiver. However a splitter/adapter will be available soon from Terk that allows you to do so.

    Dual lead antennas CAN be used with single lead receivers, use the green (satellite) colored connector on the antenna. However with this setup you will get next to no terrestrial repeater signal, only satellite. If you use the yellow/tan connector you will get only terrestrial signal and very little satellite.

    The XMPCR:

    The PCR is a bare XM module with a Serial to USB converter chip attached. It is the SAME receiver module used all current receivers. XM puts their entire receiver in to a single module, receiver manufacturers just take a bare module and add their own interface to it. The protocol used to communicate with the PCR is actually the bare protocol used by all XM modules! A guy on XMFan has already made his own control front end with a microprocessor and LCD display. He did this by tapping the serial com pins on the XM module inside the PCR. See this thread:

    A full listing of all alternative XMPCR software is listed here:

    If you haven't went to yet do so now. The XM PCR protocol was completely reverse engineered just a week after the PCR came out. This thread: contains a list of all known commands.

  2. #72
    Variable Bitrate MeanGT's Avatar
    Join Date
    Jul 2003
    Melbourne, Florida
    Quote Originally Posted by stevewm
    Just some general XM and PCR information.....

    Thanks for the info!
    My OLD Carputer:
    Currently, Don't have a carputer :( I sold my lincoln and bought a '93 Acura Vigor, plan on putting a carputer in it one of these days. You can see my vigor at: This Site

  3. #73
    Maximum Bitrate gork's Avatar
    Join Date
    Aug 2003
    Amarillo, TX
    Actually, that protocol thread is not entirely complete, and it's hard to understand. A better one is here:

    It's the one I used when I started coding my project. It was very helpful. I found some small errors in it, and I'm sending the guy a new version of the sheet soon.
    See My Project Page for Details - 2003 BMW E46 ///M3
    Custom Dash Monitor Housing - OEM Fitment
    Custom Overhead DVD-ROM Housing in Headliner
    BMW I-Bus Integration
    My homepage with many other fun projects!

  4. #74
    Newbie JonEQuest's Avatar
    Join Date
    Dec 2003
    Kenner, La
    Quote Originally Posted by Zip-Lock
    Kind of like Tivo for radio. I like the idea.
    I have TiVo, it is like a religion for me, I LOVE my TiVo, it is the best device since the TV itself

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