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help: DIY antenna for portable CD player (?)

Discussion in 'Electronic Basics' started by IRR, Aug 21, 2004.

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  1. IRR

    IRR Guest

    I've got one of these new portable cd players with a built-in FM tuner, and
    used to keep it on my desk at work to listen to the radio all the time.
    However, I've switched jobs and the radio reception at my new job really
    stinks. I'm wondering if there's a way to augment the antenna strength on
    this thing? There's no visible antenna on the player at all, and I've read
    (but not sure I believe) that the antenna is incorporated into the earphone
    wiring or something like that.

    My description seems a bit vague, so here's a picture of the thing (from
    amazon.com):

    http://www.amazon.com/exec/obidos/t...TVPDKIKX0DER&vi=pictures&img=14#more-pictures

    Any ideas on how to boost the antenna's reception?

    Thanks,
    Ian
     
  2. Dan Fraser

    Dan Fraser Guest

    It is not easy. You have to open the unit, find where the internal antenna
    connects, bring out a wire, run that wire outside, outside of the metal
    shell of the building and erect a wire outside as an antenna.

    Basically, when confronted with this kind of situation, find another station
    that comes in better, buy a radio that might work better (you cannot tell
    until you try it) or give up.
     
  3. Rich Grise

    Rich Grise Guest

    Dan Fraser top-posted without trimming:
    Or you could buy some CDs. :)

    Cheers!
    Rich
     
  4. dB

    dB Guest


    If reception outside the building is crap then you're stuck.

    If it is okay outside the building then you can overcome the problem
    by using two additional antennas. Real antennas, not bits of wire.
    Mount one outside the building, pointing in the general direction of
    the transmitter site and one inside the room or area where you work,
    pointing generally towards you. Connect the two with the type of
    cable for which they were designed.
     
  5. IRR

    IRR Guest

    Thanks for the answers so far, which suggest the poor radio reception might
    be as much or more a problem with my surroundings (i.e. building
    construction attenuating signal strength) as it is with a crappy antenna on
    the CD player, which I had originally wrote the problem off as. At least
    I've got a few new tests to try to see if I can pinpoint exactly what is
    causing the crappy signal.

    On the idea of wiring into the unit itself... any ideas on how the antenna
    works in one of these portable radio/CD players? Is the antenna really
    wired along (into?) the headphones as I had read somewhere?
     
  6. andy

    andy Guest

    couldn't you just wire a hifi tuner type fm aerial to the appropriate
    headphone lines, with maybe a passive high pass filter to keep the audio
    signal out of the aerial?

    e.g. wire up a jack plug and socket something like this:


    1.5 nF
    ||
    Left o--o---------------o-------||---------o
    | | || |
    | .-. |
    | | | |
    | | |1 kOhm |
    | '-' |
    | | |
    Gnd o--|--o------------o------------------|----------------o
    | | | |
    | | .-. |
    | | | | |
    | | | |1 kOhm | Aerial
    | | '-' |
    | | | || |
    Right o---|--|--o---------o-------||---------o----------------o
    | | | ||
    | | | 1.5 nF (3dB point = 100 KHz)
    | | |
    | | |
    | | |
    | | |
    o o o
    Left Gnd Right



    I don't know if this would work though, or if it's the right way to do the
    filter - it's a question not a solution.
     
  7. Eric R Snow

    Eric R Snow Guest

    Where I live is on the outskirtrs of good FM reception. Using a longer
    headphone wire improves reception. As does positioning the wire"just
    so"
    ERS
     
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